Fits select GM V?6 & V?8 (305, 350, 377, 454 & 502 cid EFI engines; also fits all 496 cid models; and select Black Scorpion models. This cooler is distinguishable by the blue drain plug and fuel line retainer screw that runs perpendicular to the fuel line routing.Refer to the Quicksilver catalog for up to date application information.