Schoenfeld Insert Muffler - 3.5" Core Fits 4" Collector Helmet Visor Anti-Fog Insert Features:Stock GM HEI replacement distributor

Features:Stock GM HEI replacement distributor cap

Uses the Factory Mounting Holes - for Easy Installation

We recommend it for cars up to 700 crank Hp/Tq (depending on part number) with moderate engine mods and street tires

Power Valve Cavity Seal

pulling more fuel from the carburetor

Schoenfeld Insert Muffler - 3.5" Core Fits 4" Collector Helmet Visor Anti-Fog Insert Features:Stock GM HEI replacement distributorWith its straight through design, the Schoenfeld Insert Muffler will reduce the noise level without excess back pressure. The insertis light weight with nothing to burn out. Started in 1974, Schoenfeld is known for custom fabricated headers for all forms of circle track racing. Schoenfeld Headers is the worlds largest manufacturer of circle track headers, but they specialize in a variety of high quality exhaust parts, including turn downs, extensions,