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King Engine Bearings MB 427AM1.25 AM-Series Main Bearing Set 1.25mm Undersize

(Chevrolet Camaro 1982-84, S10 1982-85, Cavalier 1985-86, S10 Blazer 1983-85, Celebrity 1982-86, Citation 1980-86, Citation II 1984-85 + 10 more models)

Part of: King Engine Bearings Main Bearing Set Oversize

Other options in this family: King Engine Bearings MB5835SI0.5 King Engine Bearings MB5557SI0.75 King Engine Bearings MB4102SI0.25 King Engine Bearings MB5280SI0.5 King Engine Bearings MB5770SI0.25

Manufacturer

Picture for manufacturer King Engine Bearings

Part Number

MB 427AM1.25
14 reviews
Sale Price

$38.39

Estimated ship date Tuesday, November 24

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Product Details

The King Engine Bearings MB 427AM1.25 is a complete crankshaft main bearing set designed for the Chevrolet 173 V6 engine. This set is supplied at a 1.25mm undersize to accommodate reground crankshafts during engine rebuilds, restoring proper oil clearances and extending engine life.

AM-Series Bearing Technology:

  • Alecular Alloy Material: Constructed from an aluminum, tin, and copper-plus alloy bonded to a high-strength steel backing — a proven bi-metal bearing construction
  • Superior Embeddability: The AM-Series material absorbs macro-particles from the oil stream, reducing scratching of crank journals and protecting Babbitt overlay integrity
  • Precision Tolerance Control: Wall thickness tolerance maintained to within ±0.0001 inches for accurate, consistent oil clearances across every shell in the set
  • Lead-Free Construction: Environmentally friendly and user-safe formula with no lead content
  • Street and Marine Rated: The AM-Series is specifically recommended for street and marine engine applications
  • Undersize: 1.25mm undersize to fit reground crankshaft journals

King Engine Bearings has been a precision bearing specialist since 1960, engineering bearings for automotive, marine, aviation, and performance applications. Every bearing undergoes rigorous quality control to ensure proper fit and long-term reliability during engine assembly.

Products specifications

Fits

Chevrolet Camaro 1982-84, S10 1982-85, Cavalier 1985-86, S10 Blazer 1983-85, Celebrity 1982-86, Citation 1980-86, Citation II 1984-85; Pontiac Firebird 1982-84, 6000 1982-86, Phoenix 1980-84; Buick Century 1982-86, Skylark 1980-85 + 6 more models

Flange Oversize

FL ON MAX

Undersize

1.25

Material

bimetal (aluminum base)

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Perfect

Best price and super fast shipping. Only issue was that their online order status system was really far behind! The system said my order was "pending" and it had been shipped. Later it said "processing" and it was on my doorstep. Not a big deal and certainly better than the opposite (they tell you something has happened when it hasn't) and doesn't keep them from being a 5 star seller in my book.

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