Thread: From the mind

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Originally Posted by Rrumbler

With standard Tri-Y headers as Doug Thorley used to build them, on one side of the engine the front and rear tubes come together in a Y and the two center ones do the same; on the other side, the front and third come together and the second and fourth. Those combos dump into the collector Y. That is for engines with a 1-8-4-3-6-5-7-2 firing order. That combo of pairing is what this looks like to me.

Rrumbler, I'd forgotten (CRS again) about the different pairings side to side to maximize scavenging. The SBF's 1-3-7-2-6-5-4-8 firing order would change the pairings, but I bet you're on target with the reason and I expect that's what Jerry was pointing out with his post.

Originally Posted by Dave Severson

Here's an excerpt from this year's Engine Master's competition, dang good numbers from a 4 valve mod motor with no supercharger, nitrous, or turbo!!!!! Read more: http://www.popularhotrodding.com/eng...#ixzz2hgptzTdG

Dave, thanks for the details, and for posting that link! Good stuff!