Ok abbreviations???.PBM Brand??.Tell the truth,I am not trilled with the low tension Mahle rings on the part number I spoke about.The TRW's on the other hand have a ring pack that is more I think in line with my use.Now the compression ratio is 9.6 with 64cc heads.If only I could get this part number L2256f30's compression ratio under control with maybe 72cc heads,don't deck the block(far as I know it is flat not needing to be cut) and a .040 head gasket,my search for this stroker pistons would be over.So Pat what do you think the compression ratio would be???.

Please and Thank You,

Gary