Page 7 of Valvetrain and Timing 2008 by Parts Pro

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 z-cams deliver serious hp torque for v-8s cam lifter kits description chevy sb v8 1957 87 262-400 c.i.d excellent low end torque and hp daily usage off road towing economy also mild turbocharged good low end and mid range torque and hp daily usage off road towing economy daily usage and off road towing performance and fuel efficiency good mid range to upper rpm torque and hp daily performance usage mild bracket racing good mid range hp performance usage ford v8 1962 87 221-302 c.i.d great low end torque and hp daily usage off road towing economy also mild turbocharged good low end and mid range torque and hp daily usage off road towing performance and fuel efficiency good mid range torque and hp daily performance and mild bracket racing ford v8 1969 93 302-351 c.i.d great low end torque and hp daily usage off road towing economy also mild turbocharged good low end and mid range torque and hp daily usage off road towing performance and fuel efficiency performance z-cams crane cams called upon their more than 40 years of computer aided cam lobe profile design experience in developing the z-cams for popular v-8 engines the z-cams are designed to increase the area beneath the lift curve in each profile simply put z-cams begin moving the valve off its seat quicker to initiate flow earlier the z-cam profile lengthens this rate of acceleration during the cycle in which the valve is opening and as it approaches maximum valve lift after max lift the z-cam then returns the valve to its seat but only after maximum flow and cylinder filling has been achieved z-cams function like a much bigger cam greater duration yet they increase low-end and mid-range torque in the most often used rpm range peak horsepower and torque output are enhanced throughout the entire rpm range z-cams were also designed to minimize horsepower-robbing harmonic frequency pulses when matched with the recommended crane valve springs and pushrods grind no rpm range advised comp ratio part no idle smooth good good fair fair z-256-2 z-262-2 z-268-2 z-274-2 z-286-2 1200-5200 1600-5400 1800-5800 2200-6400 3000-6800 8.0 to 9.5 8.5 to 10.0 8.75 to 10.75 9.5 to 10.75 10.25 to 12.0 113502 113512 113522 113532 113542 smooth good good z-256-2 z-268-2 z-274-2 1200-5000 1800-5600 2200-6000 8.0 to 9.5 8.75 to 10.5 9.5 to 10.75 363502 363512 363522 smooth good z-256-2 z-268-2 1200-5000 1800-5600 8.0 to 9.5 8.75 to 10.0 443502 443512 cam only retrofit hydraulic roller description chevy bb v8 1967 95 396-454 c.i.d excellent mid range torque and hp moderate performance usage mild bracket racing good mid range torque and hp performance usage mild bracket racing good w/manifold nitrous system idle grind no rpm range advised comp ratio part no fair fair zhr-288-2s-12 ig zhr-296-2s-12 ig 1600-5600 2200-6000 9.5 to 11.0 10.0 to 11.5 139011 139021 blue print muscle car camshafts restore the original rumble even though the musclecar era ran for only 6 or 7 years these uniquely american cars are highly desirable for collectors nostalgia buffs and those who still want to live in the past with these blueprint factory performance cams from crane you can install an exact reproduction of the cams that were original equipment on some of the finest musclecars ever built they feature all of the same specifications as oem and will produce the sound and feel that your restoration deserves description chevy sb hydraulic flat tappet 300 hp 327ci chevy sb mechanical flat tappet off-road special chevy bb hydraulic flat tappet 350 hp 396 ci chevy bb mechanical flat tappet 435 hp 427 ci pontiac v8 hydraulic flat tappet 400 hp ram air rpm range 800-4500 4200-7200 1200-4600 4400-7200 1600-5000 part no 968711 968821 969391 968561 968781 134 some parts are not legal for sale or use in california on any pollution controlled motor vehicle.

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