Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - measure valve lift at retainer
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Old 05-25-2008, 10:09 AM
tdkkart tdkkart is offline
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Pushrod lenghth should have no affect whatsoever on the lift at the valve, except on extreme examples where pushrod flex is a problem.

What I would suspect is that your rocker ratio is not exactly 1.5, woldn't be unusual at all, especially with "off-brand" rockers. Rocker flex is also a possiblity if your springs are really heavy.

Set up a test stand to check your rockers with very little spring pressure, I'll bet the ratio is actually closer to 1.44 as indicated by your measurements.
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