Quote:
Originally Posted by Skip Fix
"Let me simplify it, with this question. Will using 1.65 rockers put more strain on the pushrods, lifters and cam lobes, than using 1.5 rockers ?"
Figure EVERY BBC has had 1.7s(348-409s 1.75) BBF 1.7 + , every LS motor in trucks and cars 1.7+.
Yes it will put some mechanical stress more than a 1.5 but figure all these factory motors had even higher than 1.65s it must not be that bad.
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I don't see how there will be more stress if you change the valve springs and maintain the same seat and open pressures, but yes more stress if you leave the same springs in and thus the open pressure with 1.65 rockers are greater than they were with the 1.50 rockers. If you are building an engine from scratch and buy springs that will give you the pressures specified for the cam, matched to the valve lift, the stress will be the same regardless of rocker ratio. 1.65 rockers will use a slightly lower spring rate than will 1.5 rockers. Or am I missing something here?
I've been lurking and have enjoyed this thread.