1972 340 testing by Nick

[WymanV]

But there are good headers today that fit, don't leak and don't hang low. There's really no downside to running them except for the cost (and I sold the 68-70 manifolds in my two Barracudas for enough to pay for TTI headers).

I went with TTIs because the 340 I finally got didn't come with exhaust manifolds at all. My choice was paying a small fortune for stock 340 manifolds or paying a small fortune for shorty headers.

 

[bobscuda67]

I was surprised that the air cleaner didn't make much of a difference in the power rating.

 

[ajarofclay]

I'm not sure how much the extra gasket helped. I'd read in a couple of different articles that the stock 72 manifold inhaled as well as any aftermarket. They said the best mod would be the LD-340 just for the sake of a 30 pound weight savings. I'm sure I have the magazines in a box somewhere. That said, I did have my plenum machined down for the same effect and also have an extra stock manifold.