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1969 and later that is true,unless you have installed a higher lift cam then you will need to get a pushrod length checker(Comp Cams has them) and then you will shim the rockers or change to the correct length pushrods.SBF's prior to '68 had stud mount rockers that adjust like a SBC.
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Here is better idea and also budget friendly http://www.hotrodders.com/classified...1&cat=2&page=4 This would be a better solution and not a PIA like doing the pushrods and shim deal.The other advantage is these heads have a smaller chamber for more compression and with the stud mount rockers the cam swap would be an EZ deal,there are some good articles on www.fordmuscle.com in the Tech section about some home porting you can do to help it breathe.
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If the base circle on the new cam is the same as the stock cam, there will be no need for "adjustment". This is the "rule", not the "exception. The vast majoprity of American V8s made since '65 are "torque down" rockers, including the last generation of small block Chevy (through '97).
Generally, until lift numbers go quite "high" (over .480" in this case) aftermarket cams are ground on the same base circle as "stock" (factory) cams. FWIW Jim |
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