Exhaust Manifold Gasket Set 1988-pontiac-firebird-esi5674963 5 thread and a2-5/8" standard

5 thread and a2-5/8" standard O-Ring

and the 8 hole center hub fits most OE fan clutches

The BD SBS is powder coated for corrosion resistance

DYAD DS clutches are equipped with a lightened billet steel flywheel providing low inertia resulting in quicker RPM's

Exhaust Manifold Gasket Set 1988-pontiac-firebird-esi5674963 5 thread and a2-5/8" standarda high density non asbestos fiber metal core composite material consisting of two graphite coated, heat resistant fiber blended sheets that are mechanically and chemically fused to an expanded steel core. The finished product provides high heat resistance, excellent load retention and unmatched sealing performance on exhaust manifold and header applications. A 50% recovery rate allows for gasket expansion in the event your header loses the proper