This is a USED set of Aluminum header Adapters for a GM to Spread Ports. They are 3/4" thick.
HEADER Adapters SBC to Spread Port Steel 1/4" WISSOTA IMCA ARCA NHRA IHRA K&N
BILLET SPECIALTIES GM LS VALVE COVER CONVERSION KIT,SBC TO LS,ALUMINUM,ADAPTERS
AUDI A4 S4 B5 REAR BIG BRAKE ADAPTERS, UPGRADE TO S4 B7 REAR BRAKES BR0037
SB Chevy Header Bolts SBC 327 350 383 400 V8 Allen Socket Head Grade 8 Exhaust
Patriot Exhaust H8050, 2 Pack Natural Steel Exhaust Header Set Sbc Fits 55-57 Pa
ARP 400-1109 Header Bolts - SBC - 5/16" Head Stainless Hex Head - 1.00"
