Automatic Transmission 168 tooth Flex plate & bolts compatible with 1970-1976 Big Block Chevy & GMC 454 7.4L V8 engines using TH350 and TH400 automatic transmissions. Flex plate specifications are as follows OUTSIDE DIAMETER: 14.13" TEETH: 168 BALANCE: Internal / Neutral (without weight) SAFETY RATING: OE-replacement (not SFI-approved) This flex plate has a dual torque converter bolt pattern to accommodate 10-3/4" and 11-1/2" torque converter bolt circle patterns for the TH350, TH400, and 700R4 automatic transmissions.