Dynoed my cheap 383

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I believe it's largely in the head prep. Good valve job and some porting. And the parts have to work together. Too often people install the wrong cam with a given compression ratio.

Agree, I'm making 602hp at low RPM with a street friendly cam. IQ52 heads... Heads are everything.
 
Seriously, that's really nice power & very mild.
I'm happy for ya !
 
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