671/871 Blower Base Gasket

The 671/871 Blower Base Gasket by Weiand is a critical sealing component engineered for supercharger installations on high-performance and modified engines. This gasket sits between the blower base and engine manifold, preventing boost leak and oil seepage that would compromise both performance and engine longevity. Whether you're running a street-driven hot rod, a weekend drag racer, or a custom engine build, a quality base gasket is non-negotiable—cheap gaskets fail under pressure cycling, forcing costly teardowns and lost boost.

Weiand's 671/871 gasket is precision-cut from durable elastomer material rated for sustained boost and thermal cycling, maintaining a reliable seal across repeated pressure spikes and temperature swings inherent to supercharged operation. The gasket design conforms to both the 671 and 871 blower base footprints, making it a versatile choice for builds using either displacement variant. At 0.55 lbs and measuring 12.6 x 0.5 x 16.6 inches, this gasket fits the standard mounting interface without modification, ensuring proper clamp load distribution and eliminating hot spots that lead to premature failure. The thin profile (0.5 inches) allows correct stack height while maintaining structural integrity under full boost.

This gasket is essential for any builder upgrading from stock to forced induction or rebuilding an existing blower system. Mechanics and engine builders should always replace the base gasket during supercharger installation or removal—reusing old gaskets invites leaks and wasted horsepower. Installation requires removing the blower base, cleaning all mating surfaces to bare metal, applying a light coat of gasket sealant, and torquing fasteners in a star pattern to manufacturer spec. Compatibility spans Weiand 671 and 871 superchargers across small-block Chevy, Ford, and other platforms—verify your blower base model before ordering.