Magnum Exhaust Manifolds in an A Body

RustyRatRod said

No. I mean the Jim Laroy private dyno work. It's posted on this site somewhere, but God help you trying to find it. It wasn't in depth. All it was was basically him saying they made really no difference at all. I would trust someone like him FAR further than anyone running a magazine with sponsors.

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Don't remember that test.

I have issues with the magazine test, not because they could be skewed by sponsors, but because the 300 HP crate motor is too tame to really show a difference. Any motor that get's swapped from the beer barrel intake and EFI to a dual plane with a 4 bbl and sees virtually no difference in power between the two is not going to exercise the 318 manifolds let along anything bigger than that.

I did find a 440 that Jim did (now that I know his screen name) where he put BB HP manifolds on a low compression 440 build and saw almost no power difference when compared to the standard BB manifolds. Is that the one you are referring too?