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I read a post from a well respected poster here that there is no benefit With the 1 3/4” shorty header over the 5/8” when running the 2 1/2” h pipe and exhaust.

any opinions before I waste any money? It’s a 302 stroker.

btw I run z 1 3/4 shorty headers on my z headed 363. My other stroker also has a raised exhaust port, but it’s minimal compared to the z head.
 

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How much HP is involved. At some point the 1 5/8" will make less power compared to the 1 3/4" shortys. It would also depend on the rest of the 2 1/2" exhaust system. They are not all equal either.
 
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