Thanks Pat, it just seems like everywhere I look they make it sound like the pistons for a 1979 454 are different than a 1994 454. If you look in summit the Speed pro pistons for the 454 all have a ** next to the part number. At the bottom of the list it states **NOT FOR GEN V OR GEN IV ENGINES. I just dont understand what would be different. The stroke maybe? Thanks again for the advice.