This is a USED set of STEEL header Adapters for a GM to Spread Ports. They are 5/16" thick.
HEADER Adapters SBC to Spread Port Aluminum WISSOTA IMCA ARCA NHRA IHRA K&N
BILLET SPECIALTIES GM LS VALVE COVER CONVERSION KIT,SBC TO LS,ALUMINUM,ADAPTERS
2X V Drive Jet Boat Aluminum Water Pump Adapters SBC For Big Block Chevy Engine
AUDI A4 S4 B5 REAR BIG BRAKE ADAPTERS, UPGRADE TO S4 B7 REAR BRAKES BR0037
A/C R1234YF Adapters, R134A to R1234YF Conversion Kit Fit for AC R1234YF Air Con
ARP 400-1109 Header Bolts - SBC - 5/16" Head Stainless Hex Head - 1.00"
