I am no guru but I rememder reading a post about this exact thing on the corral a few months ago. They said that this was a problem on some of the older Edelbrok heads. You may want to do a search over there or make a post it was a big topic.
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79 Hatch: NA 347, Stage 2 Canfield Heads, Victor JR. Intake, Blueprinted Holley 750 HP, Solid Roller Cam, Shooting for 10's on motor
93 LX: Tremec, dual friction clutch, fms flywheel, Hedman shorties, O/R H-pipe
Ricer hater's club member #49
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