[HWYSTR455]

So I have 3 sets of 87cc round port E-heads, used 2 of them are 315cfm on an OE blocks, and one set 340cfm on an IA2 iron block.

I was building a boosted engine, started with an OE block and iron heads. When the IA2 block came out, I switch the guts of the OE block over to that 2nd run IA2 block.

Then I bought the 1st set of 315cfm E-heads, and swapped them onto the IA2 block.

Changed directions on the boosted build, sold the rotating assembly, and put the heads on one of the OE blocks with the heads off the IA2 block.

Bought the 2nd set of 315cfm E-heads and built the IA2 as an NA engine.

There's more, but to make a long story short, not sure which set of studs I have on the IA2 build. Shortly after startup it popped the gasket between #4 & #6 cyl, I bough the 340cfm E-heads and installed.

Had a mild seep on the head gaskets in same area on both side, nothing in the oil, just a hint of a few drips after a few startups. I used MLS gaskets and retorqued twice after a few cycles. It looks good now but will keep an eye on it.

But, just to say, I've think I've maybe had 1 head gasket failure on any of the pontiac engines I've built and never had Cometics leak. And that's why I question which studs I have.


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