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Thread: Big heads and cam no vacuume
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01-22-2007 #1New to Pro-Touring
- Join Date
- Dec 2006
- Posts
- 13
Big heads and cam no vacuume
I have an x drag car small block, 400 block 3.50 crank Dart 230 cylinder heads 13.5 compression, big roller cam, Holley 750 carb 4 corner idle with power valve blocked off 71 jets in front 80's in back ,620 lift automatic trans with a big converter. The engine was together when I purchased it. The problem; It's too rich idling an fouls plugs. I've tried a carb with a power valve (2.5) and it did not really help. The manifold vacuum is only about 3.5 when in gear at idle. I've had cars with bigger cams and not had this problem any suggestions or quick fix or band-aids ??? thanks, Mark