headers vs manifolds on a 318 2bbl difference ????

318willrun said

As far as what these headers provided on this particular vehicle for bottom end torque, the 60 ft time was the same. It also felt the same off the line. The van has the factory super-tight torque converter in it, plus it's not as light as a Duster. But I can actually FEEL by the seat of the pants as the RPM's build that it is faster with the headers.

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I put a set of Try Y's on my 73 Challenger back in the day. I didn't re-jet the carb like I should have but it didn't go any faster in the 1/8th than with manifolds and stock exhaust. It was a pretty consistent 9.75's though. I can't remember the specs but I bet they were small tubes and collector. They were Mickey Thompsons. I have never seen a set since.