Vehicle Compatibility: Fits 1955–1985 SBC engines with two-piece rear main seals, including Compatible with Chevy Compatible with V8 and 90° V6 applications 168 Tooth Design: Internal balance 168-tooth flexplate with 14.09" outside diameter, ideal for common automatic transmission installations Dual Bolt Pattern: Features 10-3/4" and 11-1/2" converter bolt patterns to support a wide range of transmission setups Heavy-Duty Construction: Steel flexplate provides dependable strength and durability for street and performance builds ARP Hardware Included: Supplied with premium ARP flexplate bolts featuring 12-point heads, larger shank diameter, and 200,000 PSI strength rating Flexplates These non-SFI rated S/B Compatible with Chevy automatic transmission flexplates are suggested whenever installing a new engine or transmission. These flexplates are for two-piece rear main seal engines ONLY. (Internal balance, 153-tooth) Dual bolt patterns, 9-3/4" and 10-3/4" Flexplate O.D. 12-3/4" Center Hole 2-1/2" (Internal balance, 168-tooth) Dual bolt patterns, 10-3/4" and 11-1/2" Flexplate O.D. 14.09" Center Hole 2-1/2" Make sure you choose the correct flywheel for your application by reading our tech article. Small Block Compatible with Chevy - How to Choose a Flexplate. ARP Bolts Flexplate bolts play an important role in the performance and safety of race cars and street machines alike. That’s why the fastener experts at ARP develop special bolts that are far superior to OEM hardware. Forged from aerospace alloy and heat-treated prior to thread rolling and machining. Fits Compatible with Chevrolet 90° V6 & 265-454 Compatible with Chevy Compatible with V8 with 2-Pc rear seal. Set of 6 bolts. Exclusive, flat, 12-point head design. Larger than stock shank diameter for increased strength and improved flexplate register. Originally developed for NASCAR Winston Cup competition. 0.24" Bolt head thickness. 200,000 psi rating.