Well the piston is .019-.021 smaller in the area of the rings then the skirt area . spec.'s for piston to wall clearance is .0035 to .0045 and when i do and engine each piston is miced and each hole is checked and each piston is then fitted to each hole with .004 skirt to wall clearance . These cast pistons can and will swell over .025-.026 or more and when you look at the damage it is all above the top compression ring not in the skirt area of the piston. and believe me when i tell ya that this happens . and they do not melt down thru the center BUT they will melt down the side past the end gap of the top ring .like this last one did . Then part of the top ring came up on top of the piston and is not embedded 3/4ths it's width in the top of the piston. And as to the heat riser question the heat rise is working and was all brand new at the time of the major overhaul. No the engine is not turning more then factory spec. RPMs and the ing. timing is dead on through the advance curve dead on and was set on a Sun 505 Dist strobe as per factory spec.'s for a C291 as a 291 has a different curve then a C263 . Full advance is set at 18 degrees at high idle . I know what i am seeing when i open up a engine as you learn fast when your playing with the lets go fast stuff and you start making lots of spare parts . with the well lets try this and OH wow we got this one to twist over 7 grand But what if we do this and see if we can turn 9 grand , Well gee she was still making power at 9500 lets see if it will take 10 grand , Oh gee maybe 9500 was more then enough the whole while your dumping floor dry and scoopen up the spare parts on the dyno room floor. so then ya start looking at the pieces to see what broke first . Yep BTDT many times , so i do believe i know what i am looking at . And oh one more thing here had i been in on the design of this engine there would have been a few upgrades to it like 7 mains two more head bolts to each cylinder and maybe even a crossflow head. A hemi head would really be nice and now that we are in the age of hy tech a fuel injection system and computer and a turbo oil coolers and yes them nifty piston cooler jets and FORGED pistons. Had i knowen that the new junk that Clevite send now would have been so bad i would not have throwen out all them forged Zolner pistons that i took out And even if the ring groves were a little wore out i am sure that thru the progressive ring chart i could have found something that would work.
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