Very true - I made the (probably incorrect) assumption
that he was going with the same rocker ratio.
--- Bob Walker <spriteracer98@yahoo.com> wrote:
> To quote David Vizard, from his book page
> 306.......If a 1.5
> rocker as opposed to 1.25 is used, the clearence set
> at the
> valve needs to be increased. For instance, if the
> valve
> clearence required was 12 thousandths with a
> standard rocker
> ratio, then it will need to go, in round figures, to
> 15
> thousandthe, ie 9.6 thou clearence at the tappet
> times 1.5.
> If it is a race cam, most of which employ 15
> thousandths
> clearence with a 1.25 rocker, we find that that's 12
> thousandths at the cam follower. translating this
> back to
> valve clearence means 18 thousandths with a 1.5
> rocker.
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