Mine are out .028" I run the grade 5 gaskets. I fill that you want the piston as close to but not touching the head as possible. I don't agree with just decking the piston to kill compression in a motor. Jeff
I think your okay! Im no engine builder though. But a thou and three tenths ain't that much lol.
Grade 5? how thick is that?
Grade C i read compressed are 0.0394 and I need to double check but i think the piston is 0.0013 above the deck
how much play do i safelyhave?
Make sure you check valve to piston clearances when making these type of changes in your motor build. You should have mininum .050 and .070 on intake and exhaust valves respectively. If you use aftermarket cams and deck the heads and block machining valve reliefs in the pistons would be necessary and these clearances are a must do item.
Grade 5? how thick is that?
Grade C i read compressed are 0.0394 and I need to double check but i think the piston is 0.013 above the deck
how much play do i safely have?
Had to edit
I believe it is more like .080 on intake and .100 on exhaust minimum. Remember this is not a gas motor
Found it they just dont call it grade 5 lol, It's just Block Over-Bored and Deck MilledCylinder Head.http://www.duramaxdiesels.com/forum/showthread.php?t=6148
1)Grade A(2)Grade B(3)Grade C(4)Block Over-Bored(5)Block Over-Bored and Deck MilledCylinder Head Gasket Grade
Henry, do you have thicknesses of each gasket type?