\'87 454 pistons I have an '87 one ton 4x4 that I just bought with a 454. I would assume that this '87 454, being a smogger motor, would have dished pistons. I also have a '91 454 (2 bolt main)out of a tow truck and would assume the same for it. Does anyone know if that would be correct? What would the stock compression ratio's be for these?