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Old 10-07-2004, 10:49 AM
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1.65 roler rockers

I have looked through the knowledge base and can't find the answer to this specific question
I have a 1967 Pontiac with a 400cid engine. The crank, pistons and rods are all stock items. I will be fitting Edelbrock performer heads with 72cc combustion chambers along with performer cam and inlet manifold. The advertised lift of the cam is .420 inlet and .442 exhaust. I would like to fit a set of roller rockers. The original rockers were, as far as I can tell, 1.52 ratio and the only roller rockers I can find that are listed (summit) for the 1967 400 engine specify a ratio of 1.65. Will these rocker require me to machine the pistons? If so can I install any 1.5 ratio rocker made for the 7/16 stud

Thanks in advance

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Old 10-07-2004, 11:48 AM
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P to V clearance should be fine. Pontiac and Ford share the same dimensions from center of pin to center of trunion. So you can buy any set of Ford rockers and they would work. Am I sure. Yes, I use to work for a rocker mfg and all of our pontiacs were Ford extrusion.

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