01-03-2016, 06:06 AM
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CC Member
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Join Date: Apr 2009
Location: Little Rock area,
AR
Cobra Make, Engine: ERA Street Roadster #782 with 459 cu in FE KC engine, toploader, 3.31
Posts: 4,527
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Not Ranked
Besides a vacuum leak it could be due to slower idle speed or less initial timing. I assume you don't have vacuum advance on the distributor? Is the cam advanced or retarded differently than before?
However 5 inches less vacuum is quite a lot of difference.
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