BM 20237 Flexplate, 153 Tooth for 55-85 Internal Balance Small Block Chevy

SKU: 20237
Fits 1955 to 1985 GM small block V8 engines except the 400 cid engine. Uses a 153 tooth ring gear. Has 10.75 inch bolt pattern. Compatible with Powerglide, TH350, TH400, and TH700R4 automatic transmissions.
Price: $102.95
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Verify This Part Fits Your Vehicle

As performance levels increase, an O.E. style flexplate just won't cut it and a stronger option is a necessity to prevent transmission and/or converter failure. B&M has you covered with our high performance flexplate designed for 1955 to 1985 small block Chevy V8 engines (internally balanced) with two piece rear main seal. Features include high tensile strength steel construction to resist elongation and cracking, 10.75 inch bolt pattern, 153 tooth ring gear with double-sided welds for added strength and comes with SFI 29.1 safety certification insuring the ultimate in safety and performance. The assembly is then Zinc plated and treated with a Chromate Conversion Coating for added corrosion resistance and durability. B&M SFI approved flexplates are ideal for extreme duty race applications as well as street cars, tow vehicles or other vehicles needing the added protection and toughness that B&M has been delivering since 1953. Compatible with Powerglide, TH350, TH400 and TH700R4 automatic transmissions.

  • Includes SFI 29.1 Certification Sticker
  • Single Pattern 10.75 Inch Bolt Circle
  • Zinc Plated Chromate Finish
  • 153 Tooth Ring Gear
Crankshaft Bolt Hole Count6Outside Diameter (in)12.84
Tooth count153Weight (lb)6
Crankshift Bolt Hole Count6SFI Certification StickerIncluded
BalanceInternalDual PatternNo
IHRA LegalYesNHRA LegalYes
SFI ApprovedYes
 California Proposition 65 Information

WARNING: This product can expose you to chemicals including Cadmium and cadmium compounds which are known to the State of California to cause cancer and birth defects, or other reproductive harm (For more information go to


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