I HAVE A SET OF 455 HEADS THAT ARE FRESH REBUILT,ONE IS A J, AND ONE IS AN E .I WAS TOLD THAT THEY HAD BEEN PORTED TO MATCH, I DON'T KNOW!I'LL TAKE 50.00 FOR THEM, YOU PAY SHIPPING,THEY HAVE ABOUT 5 MINUTES RUN TIME ON THEM BEFORD MOTOR SEIZED UP, NO DAMAGE TO THE HEADS WHATSOEVER.CALL 361-782-1241,CELL IF INTERESTED,THANX,MARTY :hammerhea