Quote:
Originally Posted by jwd
WRONG. I suggest you re-read the article you posted by John Hinckley and pay attention to the third paragraph.
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It shouldn't pose any problems at idle but where you do have to be careful is in a highway cruise situation with a fast centrifugal advance curve. Cruising at 2500 rpm with 36 to 38 deg inital and centrifugal advance all in, and 18 to 20 deg vacuum advance can cause some motors to develop a miss or repetitive light stumble from basically firing too early before TDC. My old, aluminum head BB Chevy developed this problem and I had to modify the vacuum can to limit total vacuum advance to about 10 eg which fixed the problem.