ARP GM LS Stainless Steel Complete Engine Fastener Kit - 6 Point 1443A22 570 exhaust valves these heads

570 exhaust valves these heads move massive amounts of air

To find out

Simply drill the correct size hole

Vehicle Applications: GMC SIERRA 1500 CREW CAB/CHEVROLET SILVERADO 1500 CREW CAB 19-20

1971-1974 Pontiac Grandville

ARP GM LS Stainless Steel Complete Engine Fastener Kit - 6 Point 1443A22 570 exhaust valves these headsARPs product line contains thousands of part numbers, and has expanded to include virtually every fastener found in an engine and driveline. These range from quality high performance OEM replacement parts to exotic specialty hardware for Formula 1, IndyCar, IMSA, NASCAR and NHRA drag racing and marine applications. Since 1968, ARP is the fastener of champions and the world leader in fastener technology. Product Description: Engine and Accessory