1998 - 2002 ISB Stage 1 24v Cummins Performance Head GMC Yukon XL 2500 2001 to 2002 The Allilocker™ operation is simple

The Allilocker™ operation is simple

composite reservoir

Oil in a turbo charger can reach temperatures of 400°F

ARP 9/16" Head Studs torqued to 175 ft/lbs

1998 - 2002 ISB Stage 1 24v Cummins Performance Head GMC Yukon XL 2500 2001 to 2002 The Allilocker™ operation is simpleISB Stage 1 24v Cummins Performance Head Elevate your engine's performance with our ISB Stage 1 24v Cummins Performance Head. Designed to enhance power without the added cost and complexity of an aftermarket intake, this performance head combines the best of our industry leading remanufactured cylinder heads with advanced features for superior performance. Key Features: Enhanced Valve Springs: Equipped with 105 pound valve springs for improved