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PRW Platinum Series SFI-Approved Steel Flexplate Chevrolet 454 1970-90. 168 tooth and early, .187 inch thick core with high integrity design. Will work with 4L80E and 4-L85, includes late model 6 bolt convertor pattern and external balance. These flexplates are engineered to handle extreme duty applications and designed to take the punishment of today's high horsepower engines. The 4 millimeter thick centerplate provides a solid foundation for these new designs. Ring gears are precision welded to meet SFI specifications, utilizing robotic machinery and cold-welding process.