Had a moment of CRS as ya did state 263to 291 . You do know that when ya do this change you also have to set ing. timing to the 291 spec.s and it also helps to fatten up the carb a little . The best thing is to use a C291 dist. Also what i was sayen was that these new pistons that you get today and it does not matter who you buy them from they all come from the same place Clevitte and the piston O D varies up to .003 and id of the sleeves varies also . Each engine that i have put together i start off by micen the bores and write it down then we do each piston THEN and only then is it put on the rod for that hole and the bore is honed to fit with .004 added in for skirt to wall fit Also the honing takes care of any wrinkling that may happen when the sleeve is PRESSED in . On the D 361 and DT 361-and 407's .this is most important . Now also did you set the end gaps off the wrist pin at about a 30degree angle staggered . The only oil burn that you should have should last no more then a few min.s from the lubing of the piston before it was installed and any oil that may have been on the exhaust valves. There should be NO pumping on any holes. Now IF by chance you may have broke the rings while shoving them in the holes . I hqave done a bunch of 706's over the years as i lost count of all the 706 gasser that i have bought and hauled out of Il. and In. over the twenty years that i did the buy and sell thing.
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