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how worked over are the heads? Some better flowing heads may be the reason why your lacking top end. Vortecs are good for a stockish motor, but id start looking at pro 1's or afr's.
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Not much just a little porting and polishing i thought about heads but they come at a very heafty price for the Performer Rpm Heads that i need to match my current setup but that could be the problem.
Stock Vortec Heads flow just as good if not better than the stock double hump camel back 2.02 heads-proven fact.
My whole set up is edelbrock top end kit minus the heads thats why the professional builder claimed 450 horse not the 500+ edelbrock advertises.
I've had my fair share of Holleys also and have had just as many problems thats why i decided to give something else a shot since i have heard alot of good about them. Not intending to offend anyone by asking about them.