01-09-2009, 08:41 AM
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CC Member
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Join Date: May 2006
Location: St. Louisville,
Oh
Cobra Make, Engine: A&C 67 427 cobra SB
Posts: 2,445
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Not Ranked
rocker ratio pro & con
I been thinking about what is the advantage of a 1.7:1 rocker ratio verses the factory 1.6:1.
At first glance, I thought that you can just grind the cam with more lift and do the exact same thing, but then I realized that ramp rates limit how quickly you can open and close the valves. Therefore the 1.7 would have an advantage.
On the other hand, the higher ratio puts more load on the lifter & pushrod side of things. The Boss 302 used 1.73:1, so it must be a workable load.
I would assume that it is no problem keeping the rocker centered on the valve stem, which brings me to a question. What changes: from the pivot point to the push rod or to the valve or both?
Anyways what ratio do you run? What good or bad things have you seen or heard? Give the pro's and con's.
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