Thread: Low Backpressure Side Affects?

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Friend of mine swears by the same thought. His idea is that the max diameter for a small block exhaust is 2 !/4".... He's going to come over when we build the tubes and pipes for the 'Maro, then go along when we dyno the car.... We have a huge side bet (20 oz. Diet Coke) on the results...... If he wins, I'm gonna have one fast old chebbie!!!!!!

Hah, good luck, high stakes.

Originally Posted by Dave Severson

Friend of mine swears by the same thought. His idea is that the max diameter for a small block exhaust is 2 !/4".... He's going to come over when we build the tubes and pipes for the 'Maro, then go along when we dyno the car.... We have a huge side bet (20 oz. Diet Coke) on the results...... If he wins, I'm gonna have one fast old chebbie!!!!!!

Dave, I believe that he is wrong. Hedman supposedly proved that misconception back in the '60's.

Originally Posted by NTFDAY

Dave, I believe that he is wrong. Hedman supposedly proved that misconception back in the '60's.

I should clarify..... This will be a set of equal length tubes (size to be determined by some of the 383 chebbie guru's on CHR), done in a "step" design, coming into a set of 4 into 2 into 1 merge collectors.... then an X pipe aft of the collectors.... Theory being that all of the scavenging will be done before the exhaust pipes connect, all they have to do is supply a bit of back pressure and get the exhaust out from under the car.... Probably be another ton of labor hours to gain minimal horsepower, but it's all being done in the name of learning anyhow....