I posted this on the exhaust board and several folks have looked but no response. Anyway here it goes, I've got a set of Vortec heads with what I'm guessing they call square exhaust ports and my Hedman longtubes have round ports. What exhaust gasket do I need for this application?

 

One that fits the heads.

 

Im sure that helps him alot.

 

umm correct me if im wrong but i've always taken the gaskets that fit the headers. i cant remember the part #... ill post it later when i find it.

 

It's not that simple, unfortunately. Every combo of heads & headers is different, sometimes even individual castings differ.

You need to check against both the headers and the heads... I've even seen situations where the header sealing flange didn't even land on the raised machined boss on the heads, which of course gurantees that it will never seal.

Best thing to do is to look at Mr Gasket's site and compare the dimensions they give for their gaskets to the dimensions of your parts.