Page 6 of Valvetrain and Timing 2008 by Parts Pro

powermax cams crane cams was founded in 1953 by harvey j crane jr when he became interested in hopping-up the flathead ford v-8 engine in his own car today over fifty years later crane is the one camshaft and valvetrain company that produces every camshaft in-house crane s commitment to quality control and engineering excellence is reflected in their innovative cam profiles world famous rocker arms and valvetrain components power max-260-2 for street driving and everyday use in heavier vehicles trucks vans and 4x4 trucks designed to improve performance plus economy with improved low-end torque and throttle response excellent for late model full sized passenger car applications and light towing rigs or rv s engine must have low compression ratio and operate in designated rpm range for maximum efficiency and driving satisfaction listed are some of the most popular applications call if yours is not listed suggested companion items­free flowing exhaust system with headers low rpm torque type intake manifold with minimum of 600 cfm 4 bbl carburetor power max-272-2 for heavier vehicles or towing heavy payloads if used with correct rear end gearing also very good mild street performance cam for intermediate vehicles improves performance in off-road operation can handle slightly higher than stock compression ratio but 10.50 to one maximum very popular for highway towing rigs where improved performance and fuel efficient operation is required listed are some of the most popular applications call if yours is not listed suggested companion items­free flowing exhaust system with headers aftermarket intake with 5000 to 5500 max rpm with minimum of 600 cfm 4 bbl carburetor performance valve spring and retainer change often required power max-278-2 for street performance use in light to intermediate passenger cars with correct rear end gearing and aftermarket modifications higher than stock stall speed torque converter recommended but not required in all applications not for use in trucks or heavy vehicles unless specifically recommended by crane performance consultant listed are some of the most popular applications call if yours is not listed suggested companion items­matching aftermarket intake manifold and carb with minimum of 600 cfm 4 bbl carburetor free flowing exhaust system with headers aftermarket ignition system performance rear end gearing slightly higher than stock converter stall speed possible valve spring and retainer change required cam only part no 113801 113901 113931 113941 133901 134561 363901 363941 443901 443941 523901 803901 283901 693901 cam lifters part no 113802 113902 113932 113942 133902 363902 363942 443902 443942 523902 803902 283902 693902 rec d comp ratio 9.5 to 10.75 8 to 9.50 8.5 to 10 8.75 to 10.75 8.0 to 9.5 10 to 11.50 8.0 to 9.5 8.75 to 10.5 8.0 to 9.5 8.75 to 10.0 8.0 to 9.5 8.0 to 9.5 8.0 to 9.5 8.0 to 9.5 deg lobe sep 114 112 114 112 112 114 112 112 112 112 112 112 112 112 adv duration int exh 278 290 260 272 266 272 272 284 260 272 296 306 260 272 272 284 260 272 272 284 260 276 260 272 260 272 260 272 gross valve lift int exh .467 .494 .427 .454 .440 .454 .454 .480 .484 .515 .553 .571 .456 .484 .484 .512 .456 .484 .484 .512 .493 .502 .456 .484 .427 .454 .427 .454 application chevy sb 262-400 chevy sb 262-400 chevy sb 262-400 chevy sb 262-400 chevy bb 396-502 chevy bb 396-502 ford 221-302 except ho ford 221-302 except ho ford 351w 302 ho 82-84 ford 351w 302 ho 82-84 ford boss 351 351c 351m 400 olds 260-455 67-84 pontiac 265-455 ply/dodge/chry 273-360 318 67-86 rpm range 2200-6200 1200-5000 1600-5200 1800-5600 1000-4800 3000-6800 1200-4800 1800-5400 1200-4800 1800-5400 1200-4800 1200-4800 1200-4800 1200-4800 should i consider moving up to a roller cam the answer is yes yes and yes investing the extra cost of converting from a standard flat-face cam to a crane hydraulic roller creates power and torque you can feel and use engines equipped with roller cams enjoy an extremely broad power band compared to the relatively narrow band of conventional lifters this means the engine is making peak horsepower and torque over a much wider rpm range the reason is the area under the lift curve this means the lifter roller wheel allows the cam lobe to be shaped to open and close the valves quicker increasing the flow efficiency of your engine with the correct matching valve train components a hydraulic roller cam can idle smoothly if you choose make great low-end power at 1500 rpm and still pull strong all the way through 6500 rpm useable power i can feel throughout the rpm range i ll take it some parts are not legal for sale or use in california on any pollution controlled motor vehicle 133

[close]