Distributors have high-output coils and adjustable vacuum advances, perfect for upgrading stock HEI distributors for higher RPM. Fit small and big block Chevy (except 348 and 409). Housings are CNC-machined 6061-T6 aluminum with an upper support bearing to provide accurate timing at higher RPM. Include snap-on spark plug wire retainer and instructions.Specialty items for the Shop, Trailer and Track. The Allstar Performance brand offers thousands of hard-to-find, specialty items that cover many segments in the performance aftermarket. For over 30 years, customers worldwide have come to rely on the quality, affordable and practical items available from Allstar Performance.Product Description: Ignition Control Module High Performance GM HEI 4 Pin Allstar HEI Distributors Sold Individually
