Reply to "what cam - lifters and rockers"

Excellent advice on a tricky subject. One thing not mentioned (except in the figures given) is, the cam's exhaust duration should be 5-or-so degrees MORE than the intake due to the terrible cramped-up exhaust ports and resulting poor exhaust flows in iron cylinder heads. Ford apparently had to do this in order to clear frame rails and suspensions with front-engine Mustangs and Fairlane chassis, but Panteras have far more freedom of design. This duration split should be far closer to what the intakes use if you run aftermarket aluminum heads with a corrected exhaust port.