Headers tube diameter.

Jax said

I have noticed a lot of big block headers are 1 7/8"... Is there any big block engine that has the same flange dimensions that the small block? Then I may be able to buy the headers under a big block engine, but still fit them on my small block

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A small block Chevy is close dimensionally but how would you get Chevy headers to fir your chassis?

You are either stuck with CI manifolds or PAY someone to build you headers.

I have built about a half dozen headers and I won't do it again. Way too much work.