High flow exhaust Manifolds?

big time 1X1 1/4 as opposed to

RustyRatRod said

I know that's true of the intake manifolds (mostly) but are you sure about that on the exhaust manifolds? That's one I've never heard. Not that means a damn thing. lol

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Yes they are bigger and taller. I had old LA specific headers (pre 68) and they would not seal on a 340 port, bottom of port was exposed. Red are 64 273 and orange are 340 (probably exhaust gasket port matched)...