Allstar Performance Spark Plug Index Shims 14mm 4240BK 1979-1990 GMC G3500

1979-1990 GMC G3500

Oil Filter Cutter

136 in Orifice

1977-1977 Oldsmobile Starfire

This motorsports seat belt system also features a "pull up" lap belt design which means you pull the lap belt ends toward the cam buckle to tighten the belts

Allstar Performance Spark Plug Index Shims 14mm 4240BK 1979-1990 GMC G3500Stackable shims index spark plugs at 30 intervals up to 360, properly positioning ground strap in cylinder head for increased power and clearance between spark plug and piston. Shims are intended for use with 14mm flat seat spark plugs only. Package of 24 shims contains 12 silver 60, 12 black 90, detailed instructions, and dial chart. Specialty items for the Shop, Trailer and Track. The Allstar Performance brand offers thousands of hard to find,