Tunnel Ram 383

Non of that info is mine. It's stuff I've learned...lol. It's also the basis for a program to size headers, ports, and intakes to specific rpm points and engine sizes. The program is Pipemax and a brilliant (and really nice) guy named Larry Meaux wrote it. The theories have been around since the flat head was hot rodded.
My words are my opinions. Certainly not law...lol. All in all I stand corrected fairly often, and I learn something every day...lol. No one should be afraid to comment on anything. I'm a firm believer in we wouldnt be typing if we didn't want to help. Even if our experiences and knowledge differs.
340 - I had a Wiend with two 660s on it...lol. On a 340 with a true 9.1:1 and a "284" MP cam. The results were... less than I wanted. So it wasn't there long and honestly, I haven't run one since. Not through any fault of the tunnel ram. The mismatch was my ignorance. I think the Edelbrocks (from what I've seen) are true street tunnel rams. The ports are smaller, the plenums are smaller, and they seem to be for more "mixed duty" applications. Kind of like the STR series with the replacable lids. Take the Edelbrock tunnel ram and smash it flat, and it is the STR series in terms of runner size and length although the plenum are is bigger on the STR. The Offy, Weiand, and Holley t-rams are race manifolds that we put on street cars. With the right support parts, they work well. Without it, not so much. I watched and commented on Dave's work when he was doing it and I think over all he got it very good. The question of "would a single 4bbl do better" was never a question he asked himself. He was committed to making it work well (sounds like you were/are too). IMO that attitude goes a long way to making a tunnel ram's setup, tuning process, and enjoyable service life "more user friendly".