I HAVE A 1997 ALLISON XB2003(BLUE AND WHITE) W/ 1998 2.5 MERCURY 225 PROMAX EFI.THE MOTOR IS AN ALL STOCK 225 PROMAX WITH ALL GOOD COMPRESSION WITH EVEN WARE ON ALL CYLENDERS. IT HAS AN 280 MIDSECTION ON IT I WAS TOLD FROM GUY WHEN I BOUGHT MOTOR AND A SPORTSMASTER LOWER UNIT THATS IN GREAT...