273 Headers (weird combo)

66fs said

Some headers, need to be modified to use the smaller ports on early heads. Forget whose, maybe TTI?

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I've not used TTI's. I know Doug's, Hedman's, Cyclones, and a few others I have used have "small block" headers. I've used on small port heads (273/318) and large port heads (340/360) and no issues.