They are a bit different than the Chevy L6. For $90 I'm essentially getting a 3/8th thick steel gasket. Which then I'll have fun cutting up into the individual flanges =P I bought two of them so I can build one intake/exhaust and have a spare if I need to do it again.

I pretty much just looked up a place that does water jetting in Las Vegas as I pass through there from time to time. I'll keep you in mind when the next thing that I need cut out of steel pops into my head.
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Rebuilding an OHC Pontiac 250 with EFI and a Turbo