Chris;
I didn't bother with trying to run manifolds on the 496 because that cam would never in a
million years work with them. I would guess the power loss with that cam would've been at
least 50 HP, probably considerably more.
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I think keeping the cubes at my present 454 is best idea and next rebuild going 489/496 would be an option. Hey, that's why they make 396 air cleaner stickers, right?
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Sounds like a plan.
Eric