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Old 11-10-2019, 01:33 AM   #1
fftoddster
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Join Date: Apr 2015
Posts: 158
Default spark knock under load

Crab distributor with pertronix and correct coil. Vacuum brake hooked up to manifold vacuum. Edelbrock slingshot intake with dual 97's. Edelbrock heads... 6 volt pos ground/

Runs good, maybe a bit rich but knocks under load/hard acceleration.

New to all this. What should I be looking for or try?
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