the length depends on how the rockers are sitting on the valve stem. you need a push rod checker and dial it in till the rocker is riding in the center of the stem.....then measure the lenght and thats the size you need
Do i need different PUSH RODS??
ALLRIGHT i have the proformer heads and a z303 Cam right. The block is a 306 with low comp pistions with a SC on it. Do i need to change my pushrods?? Cuz the z303 cam has a .552 lift .If i use the ford racing ones will the valves hit the pistons?? What size and kind of push rods i need!!!Thanks for the help guys.
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