| Material | Tensile Strength |
| ARP2000 | 220,000psi |
| L19 | 260,000psi |
| Custom Age 625+ | 260,000-280,000psi |
ARP are a world leader in the fastener business. Designed as a direct fit to all 4G63 engines without any drilling or tapping required. A must when on the journey to push big boost to to replace the worn and fatigued 20+ year old head bolts which have seen more than their fair share of wear and tear and abuse.
These head stud kits will provide the required clamping force to keep your engine block and head together under pressures of high boost.