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Old 10-04-2012, 08:43 AM
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Originally Posted by ssmonty View Post
Just my two cents.
Yes the lifters need to be close to the same dimension that they would be after valve adjustment(approximately 1/2 turn). If your using 3/8"-24 studs
that would be just over .020" down from the retainer ring(1 divided by 24=.0416" per revolution, divided by 1/2=.0208").
This has come up before. I posted basically the same info that you just did, then had another member come along to say that the rocker arm ratio has to be added to the equation.

Then there was this theory... At the very least, the decimal point placement is way off.

I've not had the occasion to check if the rocker arm ratio comes into play or not on an assembled engine, but my feeling is that the ratio will have an effect on the preload.

If that's the case, the preload would be 0.625" per full turn, or 0.312" for 1/2 turn.
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