Pro Copper Head Gasket - 4.380" Bore, .062" Thick SCE-P133862

Pro Copper Head Gasket - 4.380" Bore, .062" Thick P133862 SCE-P133862 Suit B/B Chev 396-455 CHEVROLET BB MK4 4.380 X .062 Pro-Copper Head Gaskets

Not all solid copper gaskets are created equal. SCE uses premium 99% pure copper sheets rolled to our specifications (choice of 12 different thicknesses) and tested for uniform flatness to assure precise cylinder head-to-block alignment and eliminate uneven loading. After processing, each gasket is annealed to ensure optimum mating and provide measurable gains in-cylinder sealing, as evidenced by lower leak-down percentages. O-ringing recommended.