SB Chevy Exhaust Gaskets 262-400 ENG. ROUND PORT

The SB Chevy Exhaust Gaskets 262-400 ENG. ROUND PORT by FEL-PRO are purpose-built sealing solutions for small-block Chevrolet engine builds ranging from 262 to 400 cubic inches. As a mechanic, you know that exhaust gasket failure is one of the most common sources of exhaust leaks and performance loss in classic and restomod builds. These round-port gaskets seal the critical junction between the cylinder head and exhaust manifold, preventing combustion gases from escaping where they shouldn't and maintaining backpressure for optimal scavenging and power delivery.

FEL-PRO's engineering focuses on material composition and conformability—these gaskets employ a high-temperature elastomer core layered with steel that withstands the thermal cycling and vibration inherent to the exhaust environment. The round-port design matches the casting geometry of stock and most aftermarket small-block heads, ensuring a complete seal without edge gaps that would bleed exhaust. The compact 0.45-inch thickness and precise dimensional tolerances mean these gaskets won't require head shaving or port manipulation to fit properly, saving hours of machine work on your build.

You'll benefit most from these gaskets during any small-block rebuild—whether you're refreshing a tired 327, building a 350 street engine, or going all-out with a 400. They're equally suited for restorations, performance upgrades, and replacement of original equipment that has degraded over decades. Installation is straightforward: torque your manifold bolts in a star pattern to manufacturer specification (typically 25–30 ft-lbs for cast iron manifolds) without over-tightening, which can distort the gasket and cause leaks. Compatibility spans virtually all round-port small-block configurations from the early 1970s forward, making these a reliable choice for any SB Chevy platform.