Posted by Bruce(OR) on November 12, 2020 at 04:19:14 from (65.102.27.56):
In Reply to: Chevy engine experts? posted by svcummins on November 11, 2020 at 19:13:07:
20" is a good number. Is that ported vacuum, manifold vacuum or venturi vacuum? Not moving tells me your gauge is sticking. '72 350 should be running about 8 degrees timing. Firing order 1-8-4-3-6-5-7-2 Point gap around .018 giving you the 30 degree dwell angle. Set the dwell first, then set timing. Place an index mark at the base of the dist base. If the mark does not move, neither does the dist in the future. Reset your dwell back to 30 degrees and the timing will fall back in.
As long as your playing, Hold the timing light on the timing marks. Does it bounce around at idle? Worn timing chain. Rev engine about 1800 Do the timing marks bounce? Worn dist shaft bushings.
Brucewellis@aol.com
Looking for higher mileage? GM Lean drop carb adj works well.
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