02-23-2004, 03:03 PM
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CC Member
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Join Date: Jan 2002
Location: Northridge,
CA
Cobra Make, Engine: Arntz Cobra
Posts: 1,839
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Not Ranked
RMB,
You have had some EXCELLENT advice here. I like the 650 Holley and use that for autocross and a 670 Avenger for the street. If you are drag racing ONLY, then a larger carb may help. I had a very similar problem last year. My vacuum advance on the distributor had ruptured, allowing a vacuum leak.
The way to test the vacuum advance (assuming that you have one): Remove the distributor cap and vacuum hose from the distributor. Twist the advance plate against the spring with one hand. Put a finger over the vacuum advance hose fitting tube. Release the plate, allowing it to return to the normal position. After a few seconds, pull your finger off the tube. You should hear a "pssst" of air suck in. If you do not hear it, try a few more times. If it is working correctly the vacuum should be maintained for a whole minute. If there is no pressure generated by this procedure, your diaphram is ruptured and you will need a new vacuum advance.
Paul
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