Yes, I know this has probably been asked multiple times, but I've never seen an answer that made sense (of course, GM didn't always make sense
).
The 62-65 optional engines (small blocks) received 2 1/2in exhaust manifolds. Then, in 66 and later cars, ALLLLLL small blocks only had 2in manifolds. Why?
The front ex pipe is 2 1/2in on 66-later cars, but the first few inches was reduced down to 2in. Why not keep the manifolds 2 1/2in also?
One would think that the later hi-perf 350 engines would benefit from the larger 2 1/2in manifolds.

The 62-65 optional engines (small blocks) received 2 1/2in exhaust manifolds. Then, in 66 and later cars, ALLLLLL small blocks only had 2in manifolds. Why?

The front ex pipe is 2 1/2in on 66-later cars, but the first few inches was reduced down to 2in. Why not keep the manifolds 2 1/2in also?

One would think that the later hi-perf 350 engines would benefit from the larger 2 1/2in manifolds.
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