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I've done 3 jobs with Cometics on stock finished motors, no leaks. Make sure everything is super clean and use copper spray on the gaskets, also used a small amount of RTV around coolant passages.
From past experience, your block should be machined to a 90RA with Cometic Multi-layer gaskets, which is very smooth. The GN1 heads usually have the correct finish from Champion. You can run them without the block being machined, but they could leak or suck coolant. In any case, use GM/AC Delco stop leak tablets with Cometics.
Such as this: http://shop.advanceautoparts.com/we...e&utm_campaign=enhancedrm&utm_content=7160111 ?
Where do you apply the copper spray and why?
Is that with a chip cause its gonna be way rich with 2 different turbos and that far apart on boost. Turbos are considerably different
I have a forged Weber shortblock with aluminum heads.I want to go with 0.032 RJC head gaskets or 84/85 GM steel shim head gaskets.I assume that an OE deck surface texture is correct given thats what I used when I ran 84/85 steel shims and they were great.Any other knowledge would be awesome.Thanks for looking.I am about to install the one's from RJC on mine. Was running felpro.