Quote:
Originally Posted by highcking
I have tried the "mouth suction" test on the NOS unit and it seems to respond properly. Even if it didn't, I can't see how the timing retards. Let me retest tomorrow to confirm the facts as I have stated them. I am pretty clear that revving the engine did NOT result in timing advance. This is apparently the result of the design --- there is no centrifugal advance, just that weird little valve mounted on the Holley 4000.
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I found a chart showing the factory advance curve. It does not show any retard at idle. The advance begins about 500 RPM and shows 3 deg. at 1,000 RPM, 11 deg. at 1500, and 17 deg. at 2500. This would be steady RPM, not while it's revving up. So you can check it with a timing light.