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Numbers do seem low but if motor doesn't have any mechanical problems that intake I am sure is not optimal at all for 427 cubes. Even a ported intake would be worth Probably 15rwhp. Most guys running those big cubes need an aftermarket intake.
My buddy had a mild 408 ls2 and even with a ported ls3 it wasn't enough. He went with one of those high ram types... can't remember which one it was years ago in a 2000s goat and he jumped like 25rwhp.
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