Steve, it sounds like you have found a somewhat overlooked truth..... big dollar parts and round ports are great, but a 400hp / 500tq Poncho 455 can be built with old D Port heads, non roller cam, and just good build technique, cam choice, and decent pistons. Good exhaust to flow it, and what you find is what you should find. 9.5 to 1 on D Ports counteracts to a degree the lower comp 8.5 CR but higher flow round ports. Not a popular thing to say maybe......
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72 Bird
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