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Discussion Starter · #1 ·
Can someone tell me if the stock 240Z exhaust manifold has square ports or diamond shape ports?

I know the cylinder head is square port (duh!). But I seem to recall seeing the diamond shape exhaust runners on a manifold before.
 

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Discussion Starter · #4 ·
So there must have been some advantage to using the diamond ports for increased flow. Possibly to straighten out flow in the transition to the circular exhaust runners.

I've also found a couple of junkyard Maxima's (82-83) that had diamond shaped ports on the exhaust manifold, mated to circular ports on the cylinder head. Unfortunately, the Maxima manifolds have shorter runners compared to the Z manifold.
 
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