Headers vs 340 manifolds

273 said

If you look at this dyno shootout a 340 manifold was worth 1hp over 360 and 4hp over 318 manifolds at 300 hp range.

Installing Exhaust Headers Into 300hp Crate Engine - Mopar Muscle Magazine

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i never trust what a magazine prints. those numbers can be correct I don't know. what i do know is that magazines can and do make article results look however they want the outcome to look. who knows what or what they didnt do in that test.