This ARP 350-2802 Flywheel Bolt Kit fits Ford 351 Nascar V8 engines and uses 3/4" socket. ARP's premium grade Pro Series has a 190,000 PSI rating and the High-Performance Series is rated at 180,000 PSI. Formed from aerospace alloy and heat-treated prior to thread rolling and machining, they are far superior to OEM hardware. Both feature an exclusive, flat, 12-point head design and larger than stock shank diameter for increased strength and improved flywheel register. Complete with washers and nuts where applicable. ARP 350-2802 Flywheel Bolt Kit Features: Fits Ford 351 Nascar V8 engines Uses 3/4" Socket 190,000 PSI 0.925 UHL 7/16-20 thread Flywheel and Flexplate bolts play an important role in the performance and safety of race cars and street machines alike. Protect yourself and your ride with ARP!