318 Factory Four BBL Intake Manifold

318willrun said
Not as much of a compression loss as one would suppose. When a guy has to choose between slightly lower compression with more flow, or the reverse, flow always wins. It's why I've stated here many times that I've NEVER put 360 heads on a 318 and lost power. I can tell you from the experience of driving them, the factory 318 Thermoquad (when up to snuff) will kick the living gizzard out of a 318 2bbl.

I agree. BTDT

Bodyperson said
I’m not sure of the exact numbers but it wasn’t a lot of gain especially running it through a single cat.

That was the problem. A dual exhaust even w/cats would have been a nice improvement.

318willrun said
I was Roadkill before the West Coast guys ever gave it a name. :)

Oh! If you tube only existed then. The crazy video I could have put up!

krazykuda said
The loss from the drop in compression is only about 3 - 5 HP according to the desktop dyno when you run it with just the compression decrease....

But you get more power from the increased port flow...

Yes, but, I think you’ll see a good bit more low end torque on the program?