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B&M Transmission Adapter Plate

SBC/BBC Engine to Buick, Olds, Pontiac TH350/TH400/TH700R Transmission.

PART# 30497

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This B&M Racing transmission bellhousing adapter plate was developed to bolt a Buick, Oldsomobile or Pontiac TH350,TH400 or TH700R4 transmission on Chevrolet small block big block engines manufactured after 1962. Does not fit late model LS or LS based LT engines. The heavy gauge adapter plate is laser cut to exacting tolerances for a precise fit, then powdercoated with a premium black finish. Also features the iconic B&M name laser cut in the plate. Includes hardware to mount the adapter plate to the transmission and installation instructions. Made in the USA.


  • Adapts Early Chevy V8 Engines to B.O.P. Transmissions
  • Durable Black Powdercoated Finish
  • Laser Cut For Precise Fitment
  • Over 65 Years of B&M Quality
  • Heavy 10-gauge Plate Steel
  • B&M Logo Laser Cut


Emission Code5
Product TypeAutomatic Transmission Adapter Plate Kit
Thickness (in)Sep-64
Transmission ModelBOP (Buick, Oldsmobile, Pontiac) TH350/TH400/TH700R Transmission
California Proposition 65 RequiredNo
Part Number30497



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.

In The Box

In The Box

  • Adapter Plate
  • Hardware and Instructions

Tech Resources

Used to adapt SBC/BBC engine to B.O.P. (Buick, Oldsmobile, Pontiac) TH350/TH400/TH700R Transmission. Does not fit LS or LS based LT engines.
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