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I am trying to get a green/big pin 750 engine going in a Sport Cruiser... I previously had small pin installed but blew it up. Trying to sort out the exhaust and need some help. I just purchased a green 750 exhaust manifold on ebay and when I got it home realized the opening to the head tube is oval vs circle (unlike my previous setup). It also has 4 bolt holes to hold head tube to manifold. I blended whatever silver 650 and small pin 750 parts I had with previous build to make this all work, but now am wondering how to do this with the big pin.

Does anyone run oval manifold with circular headtube opening? Seems it would burn up the gasket.

Is a 750 oval headtube going to work in sport cruiser? Any other insights ?

Does big pin manifold bolt to jug using studs or do I run long bolts ?

Any help appreciated. On the hunt for whatever part(s) i may need too, so if you have the answers and the parts, you get to make a sale.
 

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The exhaust uses the same bolt pattern for small and big pin, and are studs. If I remember right, the sc used the same pipe as the 750ss, so all you should need is a oval port header pipe. You need to use the 12 hole intake, and not the 10 hole small pin intake.
 

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Discussion Starter #4
Did they make both round and oval port exhaust manifold/head pipe combos? Any downside to running one vs the other ? More power / less power ?
 
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