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B&M Steel SFI Certified Flexplate - Small and Big Block Chevrolet

1957-1985 Small Block Chevrolet, 1965-up 396-427 Big Block Chevrolet and 1978-2014 GM 90 degree V6 with 2-pc Rear Main Seal, 168-Tooth, Internal Balanced.

PART# 20230

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$130.00   Suggested Retail
$116.95   Your Price
Estimated shipping date: 01/20/2021
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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 SFI approved flexplate designed for 1955-1985 GM small block (internally balanced) V8 engines along with 4.3L V6 engines. Also fits 1965-up GM big block (internally balanced) V8 engines with two piece rear main seal. Features include high tensile strength steel construction to resist elongation and cracking, dual bolt pattern 10.75 or 11.5 inch converter mounting locations, 168 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.


  • Dual Pattern 10.75-inch and 11.5-inch
  • NHRA and IHRA Legal For All Classes
  • Includes SFI Certification Sticker
  • Ideal For Street Applications
  • Zinc Plated Chromate Finish
  • To Extreme Duty Racing


# of Teeth168
Crankshift Bolt Hole Count6
Dual PatternNo
Emission Code5
IHRA LegalYes
NHRA LegalYes
Outside Diameter (in)14.1
Product TypeAutomatic Transmission Flexplate
SFI ApprovedYes
SFI Certification StickerIncluded
Weight (lb)6.5
California Proposition 65 Chemical NameCadmium and cadmium compounds
California Proposition 65 RequiredYes
Part Number20230



This part is legal for sale or use on Emissions Controlled Vehicles, Uncontrolled (Non-Emissions Controlled) Vehicles, and Racing Use Only Vehicles because it does not affect vehicle emissions and is not covered by emissions regulations.

Tech Resources

Fits 1955-1985 GM small block V8 and 90 degree V6 engines with 168 tooth ring gear. Also fits 1965-up GM big block V8 engines (internally balanced) 2pc. main seal, using a 168 tooth ring gear. Does not fit 400 cid or 454 cid engines. Has 10.75-inch and 11.5-inch dual bolt patterns.


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