These non-SFI rated Small Block Fits Chevy flex plates are suggested whenever installing a new engine or transmission. 168-tooth flexplate for 1986-97 externally balanced small block Fits Chevys (such as 305/350) with a 1-piece rear main seal. ARP flex plate bolts. Features smaller head for socket clearance. Make sure you choose the correct flywheel for your application by reading our tech article. Small Block Fits Chevy - How to Choose a Flexplate.