Here's the problem in a nutshell: I have a b16a block that's sleeved and had to be decked to insure an even surface. My Endyn/Rollerwave Wiseco pistons are 84.5mm and are sitting slightly out of the hole. I had the pistons HPC coated as can be seen in these pics. My head is blue printed and the chambers are cc'd so as to be 41.7 cc each. The red marks indicate where the piston is making contact with the head. This is with the head torqued to only 30 ft-lbs. The contact is not so severe as to eliminate movement, but this is only with a small amount of torque holding the head down. If I reshape the combustion chamber I change the dynamics of the head which was done by Alaniz Technologies. If I machine the pistons I probably will have to have them recoated by HPC. I am running a cometic head gasket for an 84.5mm bore from Golden Eagle.
What are your suggestions?

 

I would have the head redone and remove material from the sides of the combustion chamber all the way out to the 84.5mm spot facing marks. Actually, I can't tell if it is just a mark or if there was a very small amount of material removed.

Be sure to keep the quench pads intact.

-kenji

 

The pistons weren't confirured for use with heads with "pinched-in" chambers. You'll need to fit the domes to the chambers, or the chambers to the domes...and don't forget that the rods will stretch at high rpm, so you'll need at least .036-.038" clearance between the piston and chamber.