cam question
cbailey
02-24-2008, 01:54 PM
I have a early model 302 and was wondering how big of a cam i could run and still use the factory rockers, stamped steel. I want it to hit hard, duration and lift numbers please.
THANKS
ps I am running speed pro pistons with fly cut flat tops
THANKS
ps I am running speed pro pistons with fly cut flat tops
MagicRat
02-25-2008, 11:12 PM
How old is the 302?
Lets assume your engine is more than 30 years old and you have the older style heads with rocker posts.
The stock press-in posts have a tendency to pull out with big cams and strong valve springs. You need to convert to screw - in rocker studs
(302's made in the late '70's and newer had bolt-down pivot sleds for the rockers and do not have this weakness)
The stock rockers are not a problem, regardless of style. They are very durable. Fancy aftermarket rockers are not any stronger, and, in the case of aluminum rockers, much weaker.
Aftermarket rockers usually have roller tips for slightly less friction and are often slightly lighter in weight for less valve train mass and slightly higher revs..... but no better for overall durability
Lets assume your engine is more than 30 years old and you have the older style heads with rocker posts.
The stock press-in posts have a tendency to pull out with big cams and strong valve springs. You need to convert to screw - in rocker studs
(302's made in the late '70's and newer had bolt-down pivot sleds for the rockers and do not have this weakness)
The stock rockers are not a problem, regardless of style. They are very durable. Fancy aftermarket rockers are not any stronger, and, in the case of aluminum rockers, much weaker.
Aftermarket rockers usually have roller tips for slightly less friction and are often slightly lighter in weight for less valve train mass and slightly higher revs..... but no better for overall durability
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