Onservation about magnum 5.9

YY1 said
Vid in post 5 verifies 300 GROSS HP with headers from stock 5.9 (rated 245 NET HP from factory).

Did they say what headers they were for 20 HP gain over the Mag manifolds?

EDIT- 288 HP with manifolds. Headers only gained 12 HP. Interesting.
Seems to verify those manifolds are pretty good. I wonder if they were the 1992 only "big pipe" version.

EDIT 2- small manifolds.That supports the theory that those big pipe versions are "just as good" as headers.
291 HP on the "crate" version with a dual plane and a 750 carb. IMO 3 HP difference is negligible.

I wish Holdener had done a test with the exhaust manifolds as well as the headers after the cam swap. I think the cam is the real bottle neck on a stock 5.9 and until that is changed I can’t see any of it being a reasonable test.

I mean if it makes the same HP at about the same RPM with that long runner beer bear intake as it does with the MP dual plane, there has to be something else holding it back.