Ultra Seal's silicone beaded gaskets are perfect for aluminum heads & manifolds. A blend of nitrile rubber and fiber make a base that won't crack or split. They resist wicking and withstand 600 deg heat. The bead is around each port. Fits Big Block Chevy 396402 Hi-Performance Gen IV 1965-72 & 1965-90 427454 Hi-Performance Gen IV. 1/16" Thick Rectangle Stock Port 1.75W x 2.50H.
- Improves Performance
- Precision die cut for each application. These gaskets can be reused.
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