Product Summary

Standard Bearing Undersize

  • Improves Crankshaft Finish, silicon particles reduce/eliminate microscopic ferrite peaks on improperly ground/polished nodular cast iron crankshafts
  • Corrosion Resistance, defends against corrosion caused by unleaded fuels and moisture
  • Tolerance Control, all shells matched to ± .0001" vs. the competitions' ± .00025"
  • Excellent conformability, minimum depth of .012" enables greater adjustment to bore or journal misalignment without causing bearing failure or journal damage
  • Improved oil clearance, because of reduced wear, silicon bearings make it possible to maintain OE clearances over the life of the engine, which reduces operating noise, vibration, and excess oil flow

Comes as a Kit

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Key Specs

MFG. Part #9108957
BrandSpeedway Motors
Bearing UndersizeStandard
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Speedway Motors 9108957 Details

Speedway Motors has all the parts you need to rebuild your Flathead Ford V8, including these high quality rod bearing/main bearing rebuild kits.

  • Precision built to the high standards demanded by today's rodders and restorers
  • Standard size insert-style high quality aluminum bi-metal rod bearings
  • Standard size silicon bi-metal main bearings

Kit Includes:

  • (1) 1949-1953 Flathead Ford V8 Standard Bore 2.138 Insert Rod Bearings Set
  • (1) 1949-1953 Flathead Ford V8 Main Engine Bearings Set-Standard Bore

 

Flathead Ford V8 Standard Bore Rod Bearings

  • Tolerance Control: ± .0001" vs. the competitions' ± .00025"
  • Superior Embedability: Material is much thicker than Babbitt overlays (.012" vs. .0008"). This provides greater macro-particle (> .0004" diameter) embedability. Macro particles are most responsible for scratching  crank journals & tearing/weakening babbitt overlays.
  • Temperature Threshold: Bi-metal withstands 662° F (350° C) compared to tri-metal 365° F (185° C). Affords greater protection against localized overheating due to misalignment, detonation, overloading, loss of coolant, etc.
  • Conformability: Minimum depth of .012" enables greater adjustment to bore or journal misalignment without causing bearing failure or journal damage.

 

Flathead Ford V8 Standard Bore Main Engine Bearings

  • Improves Crankshaft Finish: Silicon particles reduce/eliminate microscopic ferrite peaks on improperly ground/polished nodular cast iron crankshafts.
  • Wear Resistance: During engine operation, silicon particles round off crank journal high spots, reducing friction and related wear.
  • Improved oil clearance: Because of reduced wear, silicon bearings make it possible to maintain OE clearances over the life of the engine, which reduces operating noise, vibration, and excess oil flow.
  • Tolerance Control: All shells matched to ± .0001" vs. the competitions' ± .00025"
  • Temperature Threshold: Silicon bimetal material melts/flakes at 662° F vs. tri-metal at 365° F.
  • Corrosion Resistance: Defends against corrosion caused by unleaded fuels and moisture.
  • Environmentally Friendly: All KING silicon bimetal engine bearings are "Lead Free".
  • O.E. preferred material: Most O.E. engines today use and enjoy the benefits of silicon bimetal bearings.

 

Speedway Motors 9108957 Specifications

KEY SPECS
MFG. Part #9108957
BrandSpeedway Motors
Bearing UndersizeStandard
GENERAL
Sold in QuantityKit
Narrowed BearingNo

Ratings & Reviews

5

2 Reviews

Overall Assessment

Customers confirm the product fits perfectly, evident by an increase of 10 PSI in oil pressure. Noted as a "good part", it's been praised for its quality, practicality in rebuilding Ford flatheads. The material's durability and the product's usability stand out as key features. It clearly outshines competitors in performance. The product comes highly recommended for its superior fit and quality.

5

2 reviews

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fit perfect.

5.0

4 years ago

Dick

central Florida

Verified

Fit perfect and oil pressure went up 10 PSI.

Would Recommend

Good part

5.0

5 years ago

Conny

Sweden

Verified

Rebuild ford flathead

Would Recommend

Showing 2 of 2 reviews

Questions & Answers

Fitment

  • 255 Ford Flathead V8

  • 337 Ford Flathead V8

  • 255 Ford Flathead V8

  • 337 Ford Flathead V8

  • 255 Ford Flathead V8

  • 337 Ford Flathead V8

  • 255 Ford Flathead V8

  • 337 Ford Flathead V8

  • 255 Ford Flathead V8

  • 337 Ford Flathead V8

  • 255 Ford Flathead V8

  • 337 Ford Flathead V8

  • 255 Ford Flathead V8

  • 337 Ford Flathead V8

  • 255 Ford Flathead V8

  • 337 Ford Flathead V8

  • 255 Ford Flathead V8

  • 337 Ford Flathead V8

  • 255 Ford Flathead V8

  • 337 Ford Flathead V8

  • 255 Ford Flathead V8

  • 337 Ford Flathead V8

  • 255 Ford Flathead V8

  • 337 Ford Flathead V8

  • 255 Ford Flathead V8

  • 337 Ford Flathead V8

  • 255 Ford Flathead V8

  • 337 Ford Flathead V8

  • 255 Ford Flathead V8

  • 337 Ford Flathead V8

  • 255 Ford Flathead V8

  • 337 Ford Flathead V8

  • 255 Ford Flathead V8

  • 337 Ford Flathead V8

  • 255 Ford Flathead V8

  • 337 Ford Flathead V8

  • 255 Ford Flathead V8

  • 337 Ford Flathead V8

Customer Impersonation Script