magnum 5.9 with aftermarket pistons

OK, the pistons are .170 in the hole. Using a .028 thick gasket and 60 cc for magnum stock chamber size it came out to 8:1.

This will not do. So I am going to revert to putting some KB 107 on Scat rods, re-balance assembly. Might as well.

Installing KB 107 pistons with the same setup and increased compression height will kick it up to 9.5:1. The KB107 will put the pistons at .071 in the hole, and give me some valve clearance as a bonus. Compression height on the current pistons are 1.576. The Keith Black pistons are 1.675.

I need to mic my cylinders to find out if I can just replace the .040 over smog mothers with the Keith Blacks. Should I clean them with anything more than some acetone and a rag? I have a three stone type hone, but I dont like using that thing cause it removes alot of material. I was also thinking about putting some scotch bright pads on the stones with some solvent and cleaning them lightly with that.

My concern is the piston to wall clearance. The cylinders look as though they could just use a cleanup hone to seat the rings. But I know that boring a block is matched to the piston. Would it be possible to swap the sealed power 405p smoggers to the KB107 pistons with just a hone? The present crosshatch is mostly around the head bolt areas in the walls, which seems odd to me. Wouldnt it be the other way around?

I could go .060 over after a sonic check, but I really dont want to do that.

Ill tell you one lesson learned: PULL A HEAD AND CHECK FOR STOCK BORE BEFORE PULLING A MAGNUM 5.9 OUT THE BONEYARD!

EDIT: I have to go to the farm to get my graduated burret, I am not positive that the heads have a 60 cc chamber. But in any case the current pistons have to go.