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On the track, the stumble issue is probably irrelevant since most of the guys are running in excess of 3,000 rpms most of the time.
Allan A:
I doubt that the 351W was running 30 mm Venturis. If he was, his rpm range would have been pretty limited.
The best way to check on the stumble is to measure your air fuel mixture at all rpm ranges and make adjustments accordingly. If you want the stumble to go away real quickly, drill a third progression hole.
Cracker:
I think you have some of your data turned around. Idles @ 5,340?
Something doesn't compute.
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