I have a set of pistons I ordered from Racetec to freshen a 632 cu in big block Chevy street engine with conventional heads. Beautifully made part, but some how got some wires crossed and these would have too much compression for the engine I was building. Offering them at cost $600, specs on box label in the photo below. Rings 1/16, 1/16, 3/16. I had the block honed .005" over to make it perfect but to save boring, so someone else freshening a 4.600" block may be able to do the same. Total Seal will make a ring set for the 4.605"