Well last Sunday I pushed the 455 in my 71 GS to far. Getting on I-575 I wound it out to far it went up in a cloud of smoke. Towed it home found #5 spark plug smashed & antifreeze poured out,also found the crankcase full of antifreeze.
Today with high hopes I dissembled it(oh no). Found the piston in pieces with parts all over and a big crack in the cylinder wall What to do:It seems that the pistons are Speed pro Hypereutectic. #1 & 8 are H392NCP-.030/125-04-09-A and all the rest are H392NCP-.030/125-04-09-B (whats the diff between A & B)?
The block is a 1231738 block (1/2) oil pick up/Code TA,heads #1231786/intake #8-1236403/ painted in white under the timimg cover (1708930?) All points to a 71 Riv GS engine. Questions are: 1.Can the block be sleeved when its .030 over. 2.What is the difference between #1&8 pistons stamped (A) and the rest stamped(B) 3.the only marking on the cam seems to be cast #1231304 (stock?)3. why these pistons with 4 valve receses if the rest is stock? 4. Is there a machine shop in the Atlanta area that I could trust to do this repair if it's possible.Guess this is the time to detail the engine bay. Thanks, Woody