High Lift Vs Low Lift Cam
Cams with valve lifts. The mechanism is actuated by an oil control valve through a dual-feed stationary hydraulic lash adjuster. Our Vortec kits are engineered specifically for Iron Vortec & 96 Iron LT1 heads. 579 intake and. 25 mm Duration @ 1. In this position, the came will produce more low-speed power or torque. Camshaft & Installation Kits include camshaft, tappets, cam change gaskets, engine assem. Available for the Ram 1500, 2500 & 3500. To sum up: Don't just look at cam specs and choose the cam with the biggest numbers unless you have the engine to match it. We engineer & produce custom lifting devices fit to unique specs. I was also looking at texas speed cams but not sure what one and the diffrences. Description: One of the only true boost cams for B-Series Hondas on the market. Above 270 @. On a very small cam ( duration ) then low lift is more important= The flow at 400 and above will make a differance in most cases. Comp cams 212/218 low lift, which converter. The flat head helps, although the 90 degree entry and exit angles are a disadvantage compared to a pentroof design. Turnovers hindered both teams in the first half. High Performance Billet Cams. High lift aftermarket rocker arms or a high lift cam may require using different springs that allow increased spring travel. Torque cam gear bolt to 22 ft lbs. I honestly wouldn’t recommend these heads due to the high price and low performance, especially when compared to the Edelbrock E-Street heads. Selection of 2 -step cam design using fixed cams » Stock cams (10 -mm lift) for SI operation » Low-lift cams (4, 5. DURATION Duration refers to how long a valve is opened in relation to crankshaft rotation. Performance & General Engine Building - cams: High lift & short duration vs short lift & long duration - Are there any specific perks or characteristics of a short lift w/ long duration combination that would set them apart from a tall lift w/ short duration combo or vice versa?. Variable or leakdown lifters are designed to lessen the cam duration and lift at low engine speeds by allowing more oil leakage within the lifter body while the lifter is under valve spring pressure (on the cam lobe). With MIVEC, the "cam swap" occurs automatically at a fixed engine speed. Street cams and cams that are designed to produce more low to mid-range torque typically have less overlap and more lobe separation, while cams that are designed more for maximum high speed power have more overlap and less lobe separation. This keeps the nose of the cam small enough in radius so its still fits on the bucket and also provides more room for high lift springs when used with longer valve stems and thin steel tappet followers. It calls for a milder cam, like the stock 6000 RPM cam. I would have thought that you want as aggressive opening rate as possible no matter what the specs of the cam are - hence the benefit of roller cams. All of our billet steel, LS specific custom solid roller camshaft profiles are designed and engineered per each customer's specific racing application. P1805 – Brake switch OFF failure. Comp Cams #911-16 is the correct valve spring for this cam. For technical support call 619-661-6477 or visit www. This is quite possibly the most crucial element of supercharger camshaft selection, since the supercharger cannot push more air in if there is already exhaust gases in the cylinder. The 1211 engine will have a low flow coolant system and a BC3. This is a much milder behaving cam than many people think it is, because it lifts. This cam is designed for low overall to prevent blow-by and to save boost. Low pressure areas (creating lift and sometimes drag) occur most frequently where the airstream passes over an upper curved surface – the transition from grille to bonnet, windscreen to roof, and roof to rear window. So we see here that the end result here a lop-sided camshaft with a conservative duration, high lift cam on the intake side, and a normal duration, high lift cam on the exhaust with minimal lobe separation angle and minimal (but not necessarily no) overlap. If the lift cracks over the. 26mm lift spec) in a '87 USA 3. In the switch from low- to high-speed operation, each pair of valves moves from the same low-lift, short duration cam lobe to a high-lift and long-duration profile. I figure it would improve flow a little bit throughout the powerband, just not as much high RPM flow as a traditional performance cam with extra duration. RE: Hi duration/low lift vs. Peak performance at 2000 to 6000 rpm. Selecting a Hydraulic Cam for your Pontiac Engine. This kit has everything that you need to up-grade your motor to a REAL 88cc Motor. For higher lifts, different springs are required. High lift aftermarket rocker arms or a high lift cam may require using different springs that allow increased spring travel. 500 inches lift and 250 degrees duration require. All cams will have nose and high acceleration flanks. Use CamQuest to select the perfect camshaft and valve train setup by answering a few application-specific questions. Click to enlarge. 525 lift hot cam. 660" lift dual valve springs kits. All of our billet steel, LS specific custom solid roller camshaft profiles are designed and engineered per each customer's specific racing application. I was also looking at texas speed cams but not sure what one and the diffrences. With regard to cams, he wrote: if you want low-end torque and hi-revs is not really an issue, go with a hi-lift truck cam or something similar. P2128 – APS2 high in. Solidly built, and intuitively designed, the Stable-lift allows you to load and unload your truck camper from your truck by simply pressing buttons. btw, if you wanna go for locally made performance cam, look for matspeed and powerzone. Roller cam and lifter kits are available to convert older flat tappet engines. on hood for extra heat dissipation during low speed crawling bumper with tire carrier, and high lift carrier. Cam Profile, valve spring forces and valve train weights on valve toss, pushrod force and performance. We alter your stock camshaft to new cam profile of high lift. The LS6 cam seems to be a favorite among enthusiasts, with higher lift and duration on the exhaust side when in comparison to the LS2 or LS3 cams. The wearing surfaces on the cams and rocker arms will wear out faster than normal because of the higher stresses. 721” lift Roller lifters. I need help picking a cam for my 87 350 engine. The big cam at an idle does not create much vacuum so the cans are installed. P1805 – Brake switch OFF failure. However at that lift the pressure is too low to properly control the valves at high RPM. Generally Recommended Valve Spring Pressures Please note, the valve spring pressure figures given here are guidelines only. There is an increase in valve lift of. performance & modifications. com! Log in or Sign up to interact with the CPGNation community. If you want to push the limits of your speedo, there are cams that increase your horsepower. 600 mark, they really need to get set up with a dual valve-spring kit with some full-steel retainers. The Comp Cams Stage 3 Xtreme Energy XE270AH Camshafts should be on the build list of any modified and '96 to '04 GT owner who's looking to really improve their mid-range gains in the horse power and torque area as well as pick up a pretty hefty noticeable lope at idle. Low, high and medium cam Low, high and medium cam Production AVT Development: Lotus and Eaton's Electrohydraulic; direct acting cam profile switching tappet arrangement embodied by the Lotus-INA. The minimum distance between the centres of cam and follower is 4 cm and follower diameter is 2 cm. Points to keep in mind when selecting your camshaft. Bowtie warning that for high lift cams the 1. Some oscillation is normal. This eliminates that by eliminating the shim all together. Edelbrock is the most respected name in performance. 3 w/ GPI DI Low Lift STG 3 Cam and GPI Heads Runs 11. Understood! The comp 212 218 low lift or high lift (both put out close to the same numbers) are very good cams, especially for their size and driveability. For the Boss 290 V8 engine, The stainless steel ‘Ford Motorsport’ valves were produced by Ferrea and had. I am referring to people buying them for sound/popularity and the majority of the combos they are put in don't run as well as the could. Another method of improving cam performance is to increase the amount of lobe lift. An engine equipped with a variable valve timing actuation system is freed from this constraint, allowing performance to be improved over the engine operating range. So it might be a Schneider cam, moving the RPM range for power, but it's not one of their super-duper cams, like the 300F. Called TFI to make sure the unit I bought would work with the 95 too. While they do lift your Honda, the stock springs are not made for the extra weight and leverage. The cam with the red lift curve will produce a broader power band by improving the low end performance of the engine, with a slight increase in the high end performance. 0 Camshaft Experts. Big Cam Really Low Vacuum? Hi All, I've been having an intermittent bogging problem with the Firebird while racing so I've been looking to see if I can tune it out (I know the real solution to this problem is a looser converter but I'm trying to get by for now). 0 TQ at the flywheel on our in-house SuperFlow 902 engine dyno using an otherwise stock 5. For use with ported heads and a minimum 10:1 compression ratio. Hello all if you have seen any of my other posts in building a 350 crate engine for my a body tempest its a stock 260hp unit with 882 style heads and damn near a flat cam I have stock highway gears 2400 stall on th400 and I'm looking for more low end punch to start this ones life itll have 1 5/8 shorty headers 2 1/4 duals turbo mufflers aftermarket new HEI with no power steering no a. To sum up: Don’t just look at cam specs and choose the cam with the biggest numbers unless you have the engine to match it. High Lifter Lift Kits for ATVs and UTV. Measuring this requires a degree wheel mounted on the crankshaft. Any rough casting surface, pinch, or blockage affects the flow of cylinder heads. if you have high lift and duration at idle, the car will run like crap and require more fuel and be super twitchy at idle. The high lift cams typically come with a 1. Comp cams reccomends there stage 2 cam. More lift generally means better top-end power, but you'll sacrifice bottom-end response. Just to recap, I assume phasing is relating to the harmonic content of the lobe shape? My key curiosity was how there is a current trend to high lift/less duration with. 600 then we can do a beehive spring and it will be a drop-in that can use the factory locks and retainers. Save 10% ($34. It has less duration than the F303 cam, but it has the most lift out of all the alphabet cams. performance & modifications. Powerband: 1200rpm - 5600rpm. still wont start. The lower lift and shorter duration cams will skew the power curve down so you can get more low end torque at the expense of high-end power. The camshaft timing was revised to optimize performance with the higher-lift intake cam profile. Valve springs should never be run closer than. So I am thinking about the cam to purchase. ’16 Grand Cherokee First With Upgraded Pentastar V-6. I have the Summit Vortec heads with a dual plane intake, 10:1 static (cranking psi of 200-205 avg. Both models are 14 ft. They will permit cams of. Performance and Technical information on bolt-in and high performance camshafts for Harley-Davidson Sportster motorcycles. 1L SRT Vehicles) - HHP61CAM2R Holds The World Record For Fastest & Most Powerful On A Stock Block. 529 lift split, a 212/218 duration split and 114-degree lsa. There is no overlap with the SR20VET on the low-rpm-intake cam and single exhaust cam. also remember a pontiacs port design is a venturi ( wide narrow wide ) and it needs velocity to workgood and a low lift cam will deliver it and a high torquefigure to boot I have noticed fuel doesn't puddle inthe manifolds floor like a BBC ( the vp racing fuel we use stains the the manifold with the dye they use my pontiacs are lightly stained vs My freinds BBC which is bright red in spots. The big cam at an idle does not create much vacuum so the cans are installed. High Lifter Products, Inc. With stock ports, it is true that high lift does not help. 787-inch lift, and a 109-degree lobe-separation angle) actuates the valves, while a Kaase pump and Moroso pan control the oil supply. PBS specifies the lift at T. $950 shipped or $1100 shipped with hardened pushrods. 5 rockers could work fine. 0mm), the HKS cams deliver a significant boost in open valve duration in the high-lift range (10. 00: TTS M8 Performance Valve Springs. Called TFI to make sure the unit I bought would work with the 95 too. In order to determine what cam is best for you, you need to know how well the head flows. Since submersible pumps do not experience pump cavitation and are highly efficient, these pumps one the most popular types of pumps on the market today. Posted March 23, 2017 by camcraftcams-admin. Set includes two valve covers, two oil filler caps, and baffle package. At very high RPM, valve bounce may result. But properly ported they can flow well to over. A low ball lifter will need a longer pushrod than a high ball lifter on the same setup. How is it measured? Valve Lift is the amount (usually in inches) that the valve is lifted off of its seat. I want something that will give me a. and about the vtec killer cams, they are pretty much race only as said above. The low-lift cams and. The E303 cam has a relatively low lift and so is suited for the iron heads, but higher lift cams a better choice for aftermarket heads. For higher lifts, different springs are required. The mechanism is actuated by an oil control valve through a dual-feed stationary hydraulic lash adjuster. As performance needs grew, so did overlap and lobe lift. All kits include a lifetime warranty. While both the OEM and HKS cams have very similar duration at the low-to-upper-mid lift range (0. TSP "Low Lift" Cam Package with LS6 Valve Springs $ 429. The LS6 cam seems to be a favorite among enthusiasts, with higher lift and duration on the exhaust side when in comparison to the LS2 or LS3 cams. I would have thought that you want as aggressive opening rate as possible no matter what the specs of the cam are - hence the benefit of roller cams. GM wanted high efficiency to go along with that power. It’s one of the most tenacious myths in physics and it frustrates aerodynamicists the world over. You get more lift but same duration, so its not a huge change but every little bit can help right. have not sent cams back yet. Each cam will tell you how much valve lift it has (Remember: the larger the cam, the more duration, and valve lift). ESCO Professional Aluminum & Steel Jacks (Cylinders) are known for their quality and lightweight durable design. ( please dont put red rims and whitewalls on your 72 ). 3046” cam lobe lift x rocker arm ratio of 1. Our LLR Low Lash Solid Roller Camshafts deliver the precision high RPM valve train stability that solid cams are known for with the low maintenance dependability and. P2123 – APS1 high in put failure. Roller Lifters also allow for greater lifter velocities and more lift providing for more lift and duration to help high RPM "breathing". Camshaft Lift. A high lift, high duration cam lobe is gentler on the valve train than a high lift, low. (AP) — Joe Burrow passed for 293 yards and three touchdowns, and fifth-ranked LSU scored three straight touchdowns after falling behind early in the second half to emerge with a 42-28 victory over No. Locate the Cam you've been searching for from RacingJunk Classifieds. A dual spring, which costs more. 050" tappet lift. You may also need to use different pistons because the X303 has so much valve lift. 00 in 1000' Battle of the V's; THEORY #1: HIGH LIFT CAMS & STOCK ROCKER ARMS. If you have a need for suspension, we can help you. More total lift helps, as it provides more cubic feet of air (or air/fuel) at any point in the phase than a lower lift cam/rocker setup with the same lobe velocity. Even with measurement error, that's not going to be a high lift cam. The answer is this: V2. Every cam has unique lift and overlap performance characteristics, which means you need to select cams based on exactly the kind of power you're looking for. If it is a more serious race type engine, low lift is not as important as high lift== Your cam choice is very bad if you are thinking race though. New single roller link chain drive cams. These lobes have lift and duration specifications that you dictate. The two intake valves in each cylinder are operated by a rocker arm with its own cam lobe. 370-inch lobe lift and match it to a rocker arm ratio of 1. If your engine is still stock, you probably shouldn't go there. Modern design techniques verified with Spintron testing have produced these cams that are easy on your valvetrain while they're making big power. The scissor lift is the main difference you will notice when the beds are raised. 200" , but I'd bet I'm about 15 degrees bigger. We measured Redblock cam valve events; here's what we got. S&S Lifters, Clockwise from Upper Left: Premium Lifters for 00+ XL, High Performance Lifters for 00+ XL, High Performance Lifters for 86-90 XL, High Performance Lifters for 91-99 XL. You can get away with a less lobe intensity (acceleration) if you have heads that flow well at low lift. As far as the forks vs not that's only in the. TSP 216/220 Low Lift Cam Carven "R" series exhaust. Camshaft overlap duration less than 30 degrees tends to produce good low end power. Instead of having one cam profile for the entire rev range, a VVL engine has two: low-lift and high-lift. The amazing COMP Cams XFI 273 camshaft yielded it's most significant horsepower increases over 4500 rpm generating 61 more horsepower than the stock Hemi 6. 505-inch, right at the ragged edge of the valvesprings. They will permit cams of. Before attempting any of the "Troubleshooting" items; clean the jack thoroughly using a NON-FLAMMABLE solution; lubricate the edges of the upright Steel Bar and all working parts with light oil (note the lube points shown on the Running Gear Diagram below). Description: One of the only true boost cams for B-Series Hondas on the market. These are extremely versatile camshafts with a big cam idle, but a reasonable RPM range (3,750rpm and up) for a higher RPM race build. One of the biggest factors is how far the valve opens. Performance Cams. Stock MGB rocker arms are quoted as being a 1. Cams with lower lift will allow larger throttle opening amounts at lower RPM without the dreaded Bog (as will cam sets with a less amount of overlap). 491 509 107 117 2800-5000 fair 2205 b, n. 14) Design a linear cam which will follow the displacement profile shown in the following Figure. Designing a cam profile with more lift results in increased duration in the high-lift regions where cylinder. Cruising hi-torque bolt-in cams. Now, University of Cambridge’s Professor Holger Babinsky has created a 1-minute video that he hopes will finally lay to rest a commonly used yet misleading explanation of how wings lift. The Cam Switch operation is transparent to the driver, who is simply rewarded with a smooth flow of power. The twin four-barrel option was discontinued at the end of the 1964 model year. Commercial and industrial overhead doors range from weighing a few hundred pounds to over a thousand pounds. In high lift mode, the center cam lobe engages the center finger follower and the outer finger followers via the synchronizing pin. A lot of cam lift will require a higher pressure valve spring, giving the roller cam/lifter the advantage over flat tappet cams for building higher horsepower engines. Lets say you run 1:1 rockers and swap to 1. S&S Lifters, Clockwise from Upper Left: Premium Lifters for 00+ XL, High Performance Lifters for 00+ XL, High Performance Lifters for 86-90 XL, High Performance Lifters for 91-99 XL. Application Advertised Duration @ 0. The biggest factor is the cam itself. The minimum distance between the centres of cam and follower is 4 cm and follower diameter is 2 cm. I have no personal experience or before and after dyno's, but I don't doubt them. (not aluminum LT1) That's right, no machine work required to set up a pair of these heads. However, there might be a slight loss of power at high RPM. This cam is being degreed using the centerline method. The MaxJax Lifting System is a Portable Two Post Lift that gives you the ability to make quick repairs, then store the lift out of the way when not in use. TSP 216/220 Low Lift Cam Carven "R" series exhaust. Choosing a new Camshaft for a Stock Chevy 350. Valve lift of. My question is, if I switch to the XR270HR roller lifter cam, would I get the same results. The lower lift on the intake will give a bit more low rpm torque and the higher lift on the exhaust should be good for helping the exhaust flow a bit more efficiently. Which cam is the dynamic figured with?,lol more questions than answers,are you actually going to have real world results between the two?,kinda fun to pass time. i have a 94 golf that has the motor still in it, i also have a 97 complete spare aba motor thats obd2, i basically am going to use the golf as my beater, i want to build an all motor aba 16v for my mk2 gti 16v thats my main car and were all my moneys at so thats my baby, i want to know wat i need to do to the 97 motor to make it work in the golf so i can use the 94 aba motor as my build up. In addition to the obvious (spring load, guide length), the amount of side thrust will depend on the ratio between the rocker arm's long (valve) lever and the net lift. This is a discussion on High Lift Cams within the Internal Engine forums, part of the LSx Technical Help Section category; I've been reading on LS1 for some time now and can say that there are a lot of people on. Auckland Camshafts Limited carries over 200 different profiles that suit this application. One being that a cam that is too big will result in less than favorable low RPM power. com! Log in or Sign up to interact with the CPGNation community. Higher ratio rocker arms open the valve faster, higher, and hold it open for a much greater total period of time as compared to lower ratio units. I wanted low end torque and a cam that would work with the 95 upgrade. Best power with free-flow air cleaner and performance exhaust. That usually means some pretty fierce valve accelerations off the seat, etc. Just to recap, I assume phasing is relating to the harmonic content of the lobe shape? My key curiosity was how there is a current trend to high lift/less duration with. In many cases the camshaft will fail between the nose and cylinder number 2. Click to expand Flow your cylinder heads and spec the cam for the heads and cubic inch combo,you can always play with the longer ratios if you think your motor would like a little faster valve action, but it might not like it, best thing is just to get the proper cam ground for your combination. Comments? 2002 FLSTC S & S Super E Longshots w/baffles. 5 rockers, and it's specs are. 05" lift and total lift with 1. Duration is the amount of time, measured in degrees of crankshaft rotation, that a camshaft holds a valve open. 37mm lift Ex: 260deg, 9. FK65 does have longer ramps w/advertised duration 280 vs. A cam with 260 degrees @ 50 thou lift and 102 LSA is gonna favour high RPM compared to a cam with 218 degees duration @ 50 thou and 114 LSA. ( please dont put red rims and whitewalls on your 72 ). TSP Stage 2 Low Lift 5. Higher ratio rocker arms open the valve faster, higher, and hold it open for a much greater total period of time as compared to lower ratio units. Give your small block Ford or Ford 5. You have to compromise with what you want. On longer-ratio rocker arms, the cam lobe lift stays the same while valve lift progressively increases when using a 1. Fuel Moto carries camshafts produced by Wood Performance, S&S Cycle, Cycle-Rama and Andrews Products for Harley-Davidson motorcycles. GM wanted high efficiency to go along with that power. In order to determine what cam is best for you, you need to know how well the head flows. You get more lift but same duration, so its not a huge change but every little bit can help right. All Bendpak Car lifts are ALI certified by the Auto Lift Institute and always keep up with their certification every year with them making them the backbone lifts of the automotive industry. You may also need to use different pistons because the X303 has so much valve lift. 276 vs 278 But it opens so much faster, it's 6 degrees bigger at. Browse a variety of top brands in Electric Cable Hoists such as Bannon, RoofZone, and Strongway from the product experts. Hydraulic vs. Subsection 8. Roller Lifters also allow for greater lifter velocities and more lift providing for more lift and duration to help high RPM "breathing". Roller Cams & Lifters are employed today in all-out racing engines where valve lift/area requirements preclude the possibility of employing a flat tappet (solid lifter cam). 502 E with 1. For technical support call 619-661-6477 or visit www. 59) today when you shop RevZilla for your S&S 551 Cam Kit For Harley Twin Cam 2006-2017! Free Shipping, Lowest Price Guaranteed & Top of the Line Expert Service. Tradeoffs are sensitivity to octane ratings,total timing, and air fuel ratio. Each cam will tell you how much valve lift it has (Remember: the larger the cam, the more duration, and valve lift). Our cams are designed to make real-world horsepower across a broad power band. Manufacturer of “The Original Power Tool” Hi-Lift® Jack along with accessories and other recovery related equipment designed for off-road, farm, and rescue. Lets say you run 1:1 rockers and swap to 1. Factors to consider: 1. This will have all of the cam specifications on it, including cam lift and duration. So if my cam has. Too much lift and now you need valve springs. As stated above, a high performance cam will invariably sacrifice low end power and torque for high RPM power. Find COMP Cams Camshafts with 212 int. While both the OEM and HKS cams have very similar duration at the low-to-upper-mid lift range (0. Keep with a conservative lift profile with under. Included in the kit is a high compression piston, rings, pin, circlips, high-lift camshaft, main and pilot jets, carb needle, outer clutch basket, stiffer clutch springs, primary-drive gears that alter reduction ratios, spark plug, gaskets and installation manual. I will use gators in the fall. Save 5% every day with your Target REDcard. Look into the 226/236 ASA cam from GM. 563 OVERLAP ??? LSA 115 Here is what I am debating between, the Vinci and Comp cam. Roller cams have much more aggressive ramp rates that would cause a flat tappet lifter to dig into the ramp. Selecting a Hydraulic Cam for your Pontiac Engine. I know ya'll like those high lift cams, but I'd rather have something that is a little nicer on the valvetrain. 88), edelbrock performer RPM, a Holley 750, 9. When high lift cams are used with stock lifters it has caused the shims that are used for adjusting cam/lifter clearance to fly out. Both the intake and exhaust centerline timings can be controlled to give optimum engine performance over the complete operating range. The spring bars rounded, hooked ends sit in these cams. I'm going to keep the cams and turbo the same and only change the compression ratio and head and see what it does. An engine equipped with a variable valve timing actuation system is freed from this constraint, allowing performance to be improved over the engine operating range. I could get the same camshaft local, but with a 1-bolt option, does it matter in my case? Would there be a real gain in getting a 3-bolt? I will add a new camshaft drive kit to match whatever fits the cam. Check latest price. 0 Camshaft Experts. High Lift Cams For Aluminum Heads. 554 lift @ 0. My HR cam is 2 degrees shorter at the seat. It doesn't have a very high lift @ 0. Tuning Your Camshaft for Maximum Power. 320˝ of lift at the lobe. Welcome to CPGNation. High Lift Cams. A high lift, high duration cam lobe is gentler on the valve train than a high lift, low. A unique combination of lift, cam lobe duration and an enhanced cam profile ramp provides a performance boost you can feel. What is the difference between the 1zz fe engine VS the 2zz fe engine? car switching to high-lift cam after 6000 rpm. It is essential to know how to use car jacks safely in order to perform car repairs without worrying about the car falling. This design has shown gains in the 6200+ RPM range with minimal loss in peak horsepower. Notice that the exhaust (red circle) and intake (blue circle) cycles overlap a lot more on the performance cam. Note there is an old thread with a comment by Dr. Angle Intake Lift Exhaust Lift Intake Lift TDC Exhaust Lift TDC RPM Low RPM. 050 inch lift) without changing the cam. The 440cid engine has traditionally suffered from low-tech camshaft technology. 381 on both intake and exhaust. The duration is how long, in crank degrees, the valve will be open. comps tech support kind of sucks they wont respond to my camquire thing so im thinkin isky will get my money because. S&S Lifters, Clockwise from Upper Left: Premium Lifters for 00+ XL, High Performance Lifters for 00+ XL, High Performance Lifters for 86-90 XL, High Performance Lifters for 91-99 XL. This is conducive to high-rpm power production, but at low speeds, the traditional long duration cam will effectively kill low-end grunt. The "Knight Prowler" Cams are designed by Wood Performance Carburetors, and are custom manufactured by Andrews Products to exact Wood Performance specifications. Valve Spring Tech courtesy of Kennedy's Dynotune Valve Spring Tech As is widely known, the most important aspect of selecting a valve spring is to get a spring with the correct seat pressure, open pressure, and spring rate for the cam in the engine and with the rev limit that will be used kept in mind. 480˝ of total lift at the valve, the cam itself is only producing about. Locate the Cam you've been searching for from RacingJunk Classifieds. Higher Lift requires higher valve spring loads (pressures) and flat tappet cams can only handle so much. Wet conditions a medium lift will probably not make as big a mess on the underside of the deck. Camshaft There are lots of places to pick up cams for the 8. Mushroom lifters used their larger base diameter for yet more agressive cams and the Edge-Orifice lifters reduced oil flow to the requisite roller rockers to control oil starvation at high rpm. Howards Gen III (LS-Series) Hydraulic Roller Cams at Competition Products! Howards, Hydraulic Roller Cam, Chev Gen III LS-Series 3-Bolt High lift short duration. This type of aerial work platform lift is ideal for indoor maintenance or outdoor construction tasks. This eliminates that by eliminating the shim all together. Any Twin Cam motor will benefit from the installation of our spring but it was designed for those with high lift cams and higher valve spring pressures.