I have a CR/VTEC Turbo with a OEM head gasket right now and I know it is failing because when I installed it, I did not re-torque the head bolts. I found out afterwards that this is absolutly necessary on a turbo motor (Live and Learn). My car is lacking power and is leaking oil out of the front of the block. I have researched cometic gaskets and they seem to offer a superior product. Can anyone tell me which one i should go with: My head has already been milled a few times in the past...not too sure how much. I say this because I know that there is not too much piston to valve clearance. Bore Size: 85 mm or 86.5 mm? Thickness: .025, .030, .040, .054, .067, .078, .098, or .120? My head will have to be resurfaced again once I pull it off. Please let me know which combination I should go with. What is the allowable warpage limit on the CRV B20B block......say, if the block is warped too much, if I choose a thicker headgasket, will that take care of that margin of error.