5" O.D. and 4" I.D.
Here is just a sampling of the popular exhaust manifold gaskets that we offer. Each gasket is designed to withstand the high temperatures of marine exhaust applications. Gaskets are sold individually.
Big Tube FF Gasket (Sold Each)
Sport Tube/Sweeper Flex Flare Gasket fits Merc 525/600/700 Gen-X, Hurricane Lite.
Split Flange Gasket
Adapter to Header 2-3/8" Big Tube Gasket
Adapter to Header Gasket for 2-1/8", 2-1/4" Big Tube
Head to Adapter 2-3/8" Big Tube Gasket
Head to Adapter Flange Gasket for 2-1/8, 2-1/4" Big Tube
E-Top & Sport Tube Exhaust Gasket
LS Exhaust Gasket
Small Block Chevy Adapter Flange Gasket
Small Block Chevy Round Port Exhaust Gasket
Small Block Chevy Square Port Exhaust Gasket