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If you want zero deck with those pistons and rods, he's probably going to have to mill your deck about .025", give or take a little for block squareness and casting tolerances. Nothing to worry about IMO.



Seriously ??? Would you cut .025 off a head and not worry about anything ? Not cut the intake side of the head ???

I have to do some math




Well right off the bat we almost all go to a .039 fel pro composition gasket so that puts the heads back up .017 to .018 right off the bat from stock .022 steel shims. so little change then unless you do excessive milling to the head after that nothing to worry about.
That will put his true compression around 10.2 to 1 (I cc a set of stealth's last year all were 82.5 to 83.5) so with the 3000 stall you will need for the 509 should run fine on 89 91 for sure.





the valley end rails need to be cut , you use the sme math as the intake side of the heads , .0123 for every .010 of the deck of the valley pan , ASSuMEing he is using that, will not sit flat. Plus he needs to check the heads to the valley end rails. On my 383 stroker build between the heads I was using , cut .050ish , and the deck cut about .025 , I had to take .070 off the valley rails to get the intake gasket to sit right .