Quote:
Originally Posted by 65nss4spdGTO
I set of unported 225CFM D-Ports can make 1 horsepower to cubic inch on a 455ci. That can push a 3600lb car into the 11's.
Calvin Hill
Hill Performance
708-250-7420
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No factory D-Ports flow 225 cfm Stock. A set of "slightly warmed over" D-Ports can flow in the 240 cfm range (Jim Butler sold the things for years advertising that the heads would flow better than a stock RA-IV head, which they would). Butler's cast iron head porter was a master at doing those head ports exactly the same, over and over, year after year.
I agree totally that a 225 cfm head can make one hp to cubic inch on a 455 engine.
Congrats.
Tom Vaught