Exhaust Manifold Gasket Set Copper Seal Exhaust Gasket Set Copper Seal Exhaust Gasket Set; Rectangle Port Shape; Port Dimensions W-1.56 in. x H-2.32 in.; SPECIFICATIONS: Collector Gaskets Included: No Engine Make/Size: Ford Big Block FE Gasket Line: Copper-Seal Material: Copper Port Shape: Rectangle WARNING CA Proposition 65: No FEATURES: Will Not Shrink/Deteriorate Creates A Tight Leak Proof Seal Helps Lower Under-Hood Temps Seals Irregular Surfaces Seals Slightly Damaged Surface Ideal For Tow Vehicles Ideal For Motor Homes Copperseal exhaust gaskets are unique gaskets made from .043 inch solid copper. They feature an embossed O-ring design for a leak proof seal. They won't shrink, deteriorate or blowout. Header bolts stay tight. Ideal for motor homes and towing. Using his own '57 Chevy as a rolling test bed, drag racer Joe Hrudka launched the most famous gasket company in the world more than half a century ago. Building a name for himself and his company competing at Cleveland-area tracks Norwalk and Dragway 42, Hrudka quickly established Mr. Gasket as the go-to gasket source for racers with a line of head gaskets, exhaust gaskets, oil pan gaskets, and fasteners that sealed perfectly every time and withstood the punishing temperatures and pressures of racing. Now an important part of Holley Performance, Mr. Gasket continues to expand application coverage with more and more new products for race cars and muscle cars alike. Beyond the gaskets that made the Mr. Gasket brand what it is today is an endless variety of high-performance parts, including carburetor and fuel system components, chrome-plated accessories to dress up your engine bay, fuel additives, shifter accessories, cooling-system accessories, specialty tools, and a wide array of heavy-duty suspension and driveline components.