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I just picked up a 98’ 454 that I’m going to either do a stock rebuild on with a cam or run a 496 stroker kit and a larger cam. If I use the stock bbc Vortec heads how much hp am I leaving on the table? I would like to be at the 450-500 range at the motor. Other option would be to do a stock rebuild and run aluminum heads but need a small chamber set.
 

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My gen 6 originally had 353049's on it and they performed quite well. When I rebuilt it as a 496, I went with the Brodix oval port heads and it's a fantastic motor now.
 
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