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Originally Posted by 77 TRASHCAN
I, also vote for a set of 6X-8 heads, with the 2802 cam...
I don't know what to think about using the round port heads on a specific "driver" 455. It wouldn't be a head choice I would pursue.
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I disagree. The round ports are a lot better than 6x heads. Different animal completely.
I run a set of 72s on my 400 with a mild cam and it's a blast to drive on the street. No one can catch me so far. They all catch up at the next light and just shake their heads and say they couldn't keep up. Sooo much fun beating those turbo diesel trucks that think they are all that. They are quick but no match for a real hotrod. By the time I hit third I'm passing them and they are leaning forward in their seat like they can somehow go faster like that. I just love chirping the tires in the power band while I hit third gear as I'm passing them.
I do use octane booster, one bottle a tank, just for piece of mind that my high compression 400 isn't silently destroying itself. No detonation specs on the plugs.