SFI 29.1 certified chromoly flexplate 0.035 inch thicker than stock flexplates Designed and built for racing, chevy 454 1970-90 early Manufactured to exceed OEM specifications Features double-welded ring gears designed to withstand the RPM and stress of engine torque related to high stall converters This Chromoly SFI 29.1 flexplate is a high-performance component designed for 454 engines produced between 1970 and 1990. Constructed from chromoly, this flexplate is SFI-approved for reliability in high-performance applications. With 168 teeth, it is engineered to deliver optimal performance in your 454 engine. Crafted from premium chromoly, it offers exceptional strength and durability. This enables it to withstand the demands of high-performance engines and intense driving conditions. It is SFI 29.1 approved, meeting the stringent standards set by the SFI Foundation. This certification guarantees that the flexplate can withstand the stresses of high RPMs and torque, offering peace of mind for racing and performance. The flexplate is specifically designed for 454 engines manufactured between 1970 and 1990. Its precise design ensures a proper fit and optimal performance, meeting the unique requirements of these engines. With 168 teeth, this flexplate is engineered for engagement with your engine's starter. This ensures reliable starting performance, even under extreme conditions. The flexplate is designed for engines with external balancing to ensure proper weight distribution and efficient engine operation.