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How much power you looking to get out of them? Screw in studs and a better valve job is pretty much all I have into mine. 400hp. no prob.
 
383 w/ XE 274 cam & Vortecs= great power! Best bang for the buck heads on the market- only 2 things to "worry" about:
compression (they tend to add compression becasue of small chambers) and need to machine the heads to accept larger springs for "bigger" cams- actually you can buy them "ready" now for that.
Otherwise, I wouldn't get anything else!
 
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