Compatible with Oldsmobile® 400-455 V8. This product is not created or sold by GM®.; SCE Gaskets Accu-Seal Pro intake gaskets enhance sealing around intake ports and coolant passages with silicone beads and premium gasket materials seal tight. Doing what gaskets are supposed to do resisting the weeping of oil and coolant. They also have a release coating for easy clean-up. These gaskets fit Olds 400-455 V8 engines with "large port" heads and the rectangular port openings measure 1.4 x 2.4 inches. Compressed thickness is approximately .062 inches.;.
