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Clevite CB743HN21

Connecting Rod Bearing Chevy 1958-2007 V8 348/366/396/402/409/427/454/496ci (8.1L) with -.021" Undersize

Clevite CB743HN21

695-CB743HN21 NEW

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Clevite CB743HN21 Connecting Rod Bearing Chevy 1958-2007 V8 348/366/396/402/409/427/454/496ci (8.1L) with -.021" Undersize $14.99
Connecting Rod Bearing
  • Chevy
  • 1958-2007
  • V8 348/366/396/402/409/427/454/496ci (8.1L)
  • -.021" Undersize
  • HN Series

  • Clevite CB743HN21 Details

    Connecting Rod Bearings

    Notes
  • H Series Bearings - High-Performance Bearing
  • N Series Bearings - Narrowed for greater crankshaft fillet clearance

  • Specifications:

    Manufacturer's Part Number:
    CB743H21

    These Tri-Metal 77 engine bearings combine the strength of a copper-lead alloy layer with steel backing and an electroplated babbitt metal. The steel backing provides strength and durability; the babbitt overlay provides the critical surface characteristics of slipperiness and conformability. This ideal design has properties not even found in many original equipment bearings. Clevite offers main bearings, rod bearings and cam bearings in this series.

    H Series -
  • Best to start with when unsure which bearing to choose
  • Medium level of eccentricity and high crush
  • Enlarged chamfers for greater crankshaft fillet clearance
  • Made without flash plating for better seating
  • Use with crankshafts that have oversized fillets
  • Use with engines that run mid-high RPM range
  • Contact patterns should ideally cover 2/3 to 3/4 of the bearing surface

    P Series -
  • Typically the greatest level of eccentricity
  • Rods and mains have high crush for maximum retention
  • Most are fully grooved to maximize oil flow to rod bearings
  • Reduced overlay thickness to prevent overlay fatigue
  • Use where extremely high RPMs cause severe rod bore close-in
  • Use where higher eccentricity is desired to narrow bearing contact patterns

    V Series -
  • This series essentially duplicates Clevite's former Vandervell parts
  • Typically low to medium eccentricity
  • Not available with oversized chamfers
  • No flash plating on the steel back
  • All Clevite main bearing sets use a single-piece thrust bearing
  • Narrowed parts available to accommodate increased crankshaft fillet clearance
  • Lead-indium overlay offers slightly better conformability

    M Series -
  • These are special purpose bearings having a nominal .005" thick Babbitt lining on a hardened steel back
  • They are intended mainly for Blown Fuel engines where severe crankshaft deflections cause edge loading of the bearings
  • Under these operating conditions bearing service life will be very short
  • Frequent inspection and replacement is recommended


    Part Number Key
    • H - High-Performance
    • HD - High-Performance bearing with dowel hole
    • HK - High-Performance bearing with moly/graphite coating
    • P - Standard Clevite 77 tri-metal bearing
    • M - Blown Fuel Engine bearing for severe crankshaft deflections & edge loading
    • N - High-Performance Narrowed for greater crankshaft fillet clearance
    • HG - High-Performance full angular grooved bearing
    • V - High-Performance with Lead Indium overlay (On Main Sets this indicates partial groove also)
    • VG - High-Performance with Lead Indium full angular grooved bearing
    • D - Bearing has a dowel hole
    • K - Tri-Armor coated bearing
    • X - Bearing has .001 more oil clearance than standard
    • XX - Bearing has .002 more oil clearance than standard
    • A or AL - Indicates Aluminum bearing material

    Note: Clevite main and cam bearings are priced as sets; rod bearings are priced each unless noted.

  • Does Clevite CB743HN21 fit your vehicle?

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    1987-1988 CHEVROLET V30 PICKUP

    • Liter: 7.4
    • SubModel: SCOTTSDALE
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1973 CHEVROLET LAGUNA

    • CC: 7441
    • Liter: 7.4
    • SubModel: ESTATE
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1970-1972 CHEVROLET CAMARO

    • CC: 6588
    • Liter: 6.6
    • SubModel: BASE
    • CUI: 402
    • EngineType: V8 ( 6.6 L / 402 )

    1976-1980 CHEVROLET C10 SUBURBAN

    • Liter: 7.4
    • SubModel: SILVERADO
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1972 CHEVROLET C30 PICKUP

    • CC: 6588
    • Liter: 6.6
    • SubModel: BASE
    • CUI: 402
    • EngineType: V8 ( 6.6 L / 402 )

    1988-1992 CHEVROLET K3500 PICKUP

    • Liter: 7.4
    • SubModel: SCOTTSDALE
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1975 GMC SPRINT

    • Liter: 6.6
    • SubModel: SP
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1999-2000 CHEVROLET C3500 PICKUP

    • Liter: 7.4
    • SubModel: BASE
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    2007 CHEVROLET SILVERADO 3500 CLASSIC

    • Liter: 8.1
    • SubModel: CLASSIC WT
    • CUI: 496
    • EngineType: V8 ( 8.1 L / 496 )

    1969 CHEVROLET CAMARO

    • Liter: 7.0
    • SubModel: BASE
    • CUI: 427
    • EngineType: V8 ( 7.0 L / 427 )

    1973-1974 CHEVROLET C20 PICKUP

    • Liter: 7.4
    • SubModel: BASE
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1987-1988 CHEVROLET R30 PICKUP

    • Liter: 7.4
    • SubModel: CUSTOM DELUXE
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1992-1994 CHEVROLET C2500 SUBURBAN

    • Liter: 7.4
    • SubModel: SILVERADO
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1969 CHEVROLET C10 PICKUP

    • CC: 6489
    • Liter: 6.5
    • SubModel: BASE
    • CUI: 396
    • EngineType: V8 ( 6.5 L / 396 )

    2001-2005 CHEVROLET SILVERADO 2500 HD

    • CC: 8128
    • Liter: 8.1
    • SubModel: BASE
    • CUI: 496
    • EngineType: V8 ( 8.1 L / 496 )

    2003-2007 GMC C5500 TOPKICK

    • CC: 8128
    • Liter: 8.1
    • SubModel: C5C042
    • CUI: 496
    • EngineType: V8 ( 8.1 L / 496 )

    2007 CHEVROLET SILVERADO 3500 CLASSIC

    • Liter: 8.1
    • SubModel: CLASSIC LT
    • CUI: 496
    • EngineType: V8 ( 8.1 L / 496 )

    1966 CHEVROLET CORVETTE

    • Liter: 7.0
    • SubModel: BASE
    • CUI: 427
    • EngineType: V8 ( 7.0 L / 427 )

    1999-2000 CHEVROLET C2500 PICKUP

    • Liter: 7.4
    • SubModel: BASE
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1966-1967 CHEVROLET CAPRICE

    • Liter: 7.0
    • SubModel: BASE
    • CUI: 427
    • EngineType: V8 ( 7.0 L / 427 )

    1988-1998 CHEVROLET K3500 PICKUP

    • Liter: 7.4
    • SubModel: SILVERADO
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    2003-2007 CHEVROLET C6500 KODIAK

    • CC: 8128
    • Liter: 8.1
    • SubModel: C6V042
    • CUI: 496
    • EngineType: V8 ( 8.1 L / 496 )

    1968-1969 CHEVROLET CAPRICE

    • CC: 6998
    • Liter: 7.0
    • SubModel: BASE
    • CUI: 427
    • EngineType: V8 ( 7.0 L / 427 )

    1972 CHEVROLET C10 PICKUP

    • Liter: 6.6
    • SubModel: BASE
    • CUI: 402
    • EngineType: V8 ( 6.6 L / 402 )

    1968 CHEVROLET CHEVY II

    • CC: 6489
    • Liter: 6.5
    • SubModel: NOVA
    • CUI: 396
    • EngineType: V8 ( 6.5 L / 396 )

    1973-1974 CHEVROLET C10 PICKUP

    • Liter: 7.4
    • SubModel: BASE
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1994-2000 GMC K3500 PICKUP

    • Liter: 7.4
    • SubModel: SIERRA SLT
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1991-1998 CHEVROLET K2500 PICKUP

    • Liter: 7.4
    • SubModel: CHEYENNE
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1970-1972 CHEVROLET CHEVELLE

    • CC: 6588
    • Liter: 6.6
    • SubModel: CONCOURS ESTATE
    • CUI: 402
    • EngineType: V8 ( 6.6 L / 402 )

    1990-1993 CHEVROLET C1500 PICKUP

    • Liter: 7.4
    • SubModel: SILVERADO
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1989-1991 CHEVROLET R3500 PICKUP

    • Liter: 7.4
    • SubModel: SILVERADO
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1973-1974 CHEVROLET LAGUNA

    • CC: 7441
    • Liter: 7.4
    • SubModel: BASE
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1981 CHEVROLET K30 PICKUP

    • Liter: 7.4
    • SubModel: CHEYENNE
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1972 CHEVROLET BISCAYNE

    • CC: 6588
    • Liter: 6.6
    • SubModel: BASE
    • CUI: 402
    • EngineType: V8 ( 6.6 L / 402 )

    1972-1974 CHEVROLET CORVETTE

    • CC: 7441
    • Liter: 7.4
    • SubModel: BASE
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1978 CHEVROLET K5 BLAZER

    • Liter: 7.4
    • SubModel: SILVERADO
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1974 CHEVROLET EL CAMINO

    • Liter: 7.4
    • SubModel: CUSTOM
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    2005 GMC C4500 TOPKICK

    • CC: 6599
    • Liter: 8.1
    • SubModel: C4E044
    • CUI: 403
    • EngineType: V8 ( 8.1 L / 403 )

    2006 CHEVROLET SILVERADO 3500

    • CC: 8128
    • Liter: 8.1
    • SubModel: LS
    • CUI: 496
    • EngineType: V8 ( 8.1 L / 496 )

    1990-1996 CHEVROLET C70 KODIAK

    • CC: 6998
    • Liter: 7.0
    • SubModel: C7H042
    • CUI: 427
    • EngineType: V8 ( 7.0 L / 427 )

    1999-2000 CHEVROLET K2500 PICKUP

    • Liter: 7.4
    • SubModel: BASE
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1997-1998 GMC C7500 TOPKICK

    • Liter: 6.0
    • SubModel: C7H042
    • CUI: 366
    • EngineType: V8 ( 6.0 L / 366 )

    1975 GMC SPRINT

    • Liter: 6.6
    • SubModel: HIGH SIERRA
    • CUI: 402
    • EngineType: V8 ( 6.6 L / 402 )

    1988-1998 CHEVROLET C3500 PICKUP

    • Liter: 7.4
    • SubModel: SILVERADO
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1989-1993 GMC G35/G3500 VAN

    • Liter: 7.4
    • SubModel: VANDURA SPECIAL
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1970 CHEVROLET CHEVELLE

    • CC: 6556
    • Liter: 6.6
    • SubModel: NOMAD
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1972 CHEVROLET MONTE CARLO

    • CC: 6556
    • Liter: 6.6
    • SubModel: BASE
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1981-1986 CHEVROLET K30 PICKUP

    • Liter: 7.4
    • SubModel: CUSTOM
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    2002-2006 CHEVROLET AVALANCHE 2500

    • EngineType: ALL
    • SubModel: ALL

    1981 CHEVROLET C30 PICKUP

    • Liter: 7.4
    • SubModel: DELUXE
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1994-1997 CHEVROLET K3500 PICKUP

    • Liter: 7.4
    • SubModel: BASE
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1973-1974 CHEVROLET C10 SUBURBAN

    • Liter: 7.4
    • SubModel: BASE
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    2005 GMC C4500 TOPKICK

    • CC: 6599
    • Liter: 8.1
    • SubModel: C4V042
    • CUI: 403
    • EngineType: V8 ( 8.1 L / 403 )

    1988-1993 GMC K3500 PICKUP

    • Liter: 7.4
    • SubModel: SIERRA
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1972 GMC SPRINT

    • CC: 7439
    • Liter: 7.4
    • SubModel: CUSTOM
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1975 GMC SPRINT

    • Liter: 6.6
    • SubModel: CLASSIC
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1988-2000 GMC K3500 PICKUP

    • Liter: 7.4
    • SubModel: SIERRA SLE
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1970-1972 CHEVROLET CHEVELLE

    • CC: 7439
    • Liter: 7.4
    • SubModel: SS
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    2001-2002 GMC SIERRA 2500 HD

    • Liter: 8.1
    • SubModel: SL
    • CUI: 496
    • EngineType: V8 ( 8.1 L / 496 )

    1970 CHEVROLET NOVA

    • Liter: 6.5
    • SubModel: BASE
    • CUI: 396
    • EngineType: V8 ( 6.5 L / 396 )

    1970 CHEVROLET BISCAYNE

    • CC: 6588
    • Liter: 6.6
    • SubModel: BASE
    • CUI: 402
    • EngineType: V8 ( 6.6 L / 402 )

    2007 CHEVROLET SILVERADO 2500 HD CLASSIC

    • Liter: 8.1
    • SubModel: CLASSIC WT
    • CUI: 496
    • EngineType: V8 ( 8.1 L / 496 )

    2003-2007 GMC C4500 TOPKICK

    • CC: 8128
    • Liter: 8.1
    • SubModel: C4V042
    • CUI: 496
    • EngineType: V8 ( 8.1 L / 496 )

    1970-1972 CHEVROLET C10 SUBURBAN

    • CC: 6588
    • Liter: 6.6
    • SubModel: BASE
    • CUI: 402
    • EngineType: V8 ( 6.6 L / 402 )

    1994-2000 GMC K2500 PICKUP

    • Liter: 7.4
    • SubModel: SIERRA SL
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    2003-2007 GMC C6500 TOPKICK

    • CC: 8128
    • Liter: 8.1
    • SubModel: C6C042
    • CUI: 496
    • EngineType: V8 ( 8.1 L / 496 )

    1968 CHEVROLET C30 PICKUP

    • CC: 6489
    • Liter: 6.5
    • SubModel: BASE
    • CUI: 396
    • EngineType: V8 ( 6.5 L / 396 )

    1997-1998 GMC C6500 TOPKICK

    • Liter: 6.0
    • SubModel: C6H042
    • CUI: 366
    • EngineType: V8 ( 6.0 L / 366 )

    1972 CHEVROLET EL CAMINO

    • Liter: 6.6
    • SubModel: BASE
    • CUI: 402
    • EngineType: V8 ( 6.6 L / 402 )

    2005-2007 CHEVROLET C4500 KODIAK

    • CC: 8128
    • Liter: 8.1
    • SubModel: C4C044
    • CUI: 496
    • EngineType: V8 ( 8.1 L / 496 )

    1970-1972 CHEVROLET CHEVELLE

    • CC: 7439
    • Liter: 7.4
    • SubModel: CONCOURS
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1970 CHEVROLET CHEVELLE

    • CC: 7439
    • Liter: 7.4
    • SubModel: BASE
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1994-1995 CHEVROLET K2500 PICKUP

    • Liter: 7.4
    • SubModel: WT
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1970 CHEVROLET EL CAMINO

    • CC: 7441
    • Liter: 7.4
    • SubModel: BASE
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1971-1972 CHEVROLET MONTE CARLO

    • CC: 6588
    • Liter: 6.6
    • SubModel: BASE
    • CUI: 402
    • EngineType: V8 ( 6.6 L / 402 )

    2001-2002 GMC SAVANA 3500

    • Liter: 8.1
    • SubModel: SLT
    • CUI: 496
    • EngineType: V8 ( 8.1 L / 496 )

    1968 GMC K25/K2500 PICKUP

    • CC: 6489
    • Liter: 6.5
    • SubModel: BASE
    • CUI: 396
    • EngineType: V8 ( 6.5 L / 396 )

    2001-2002 GMC C3500HD

    • CC: 8128
    • Liter: 8.1
    • SubModel: BASE
    • CUI: 496
    • EngineType: V8 ( 8.1 L / 496 )

    2003-2007 CHEVROLET C4500 KODIAK

    • CC: 8128
    • Liter: 8.1
    • SubModel: C4V042
    • CUI: 496
    • EngineType: V8 ( 8.1 L / 496 )

    2003-2007 CHEVROLET C4500 KODIAK

    • CC: 8128
    • Liter: 8.1
    • SubModel: C4E042
    • CUI: 496
    • EngineType: V8 ( 8.1 L / 496 )

    1981-1983 GMC C3500 PICKUP

    • Liter: 7.4
    • SubModel: SIERRA CLASSIC
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1968-1969 CHEVROLET CAPRICE

    • CC: 6489
    • Liter: 6.5
    • SubModel: BASE
    • CUI: 396
    • EngineType: V8 ( 6.5 L / 396 )

    1974 CHEVROLET MALIBU

    • CC: 7441
    • Liter: 7.4
    • SubModel: CLASSIC
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    2006 CHEVROLET SILVERADO 3500

    • CC: 8128
    • Liter: 8.1
    • SubModel: WT
    • CUI: 496
    • EngineType: V8 ( 8.1 L / 496 )

    1970 CHEVROLET IMPALA

    • CC: 6556
    • Liter: 6.6
    • SubModel: BASE
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1975 CHEVROLET MALIBU

    • Liter: 7.4
    • SubModel: CLASSIC
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1988-1993 GMC C3500 PICKUP

    • Liter: 7.4
    • SubModel: SIERRA
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1972 CHEVROLET BISCAYNE

    • CC: 6556
    • Liter: 6.6
    • SubModel: BASE
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1971 CHEVROLET CAPRICE

    • CC: 6588
    • Liter: 6.6
    • SubModel: BASE
    • CUI: 402
    • EngineType: V8 ( 6.6 L / 402 )

    1989-1991 CHEVROLET V3500 PICKUP

    • Liter: 7.4
    • SubModel: CHEYENNE
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1972 CHEVROLET BEL AIR

    • CC: 6556
    • Liter: 6.6
    • SubModel: BASE
    • CUI: 400
    • EngineType: V8 ( 6.6 L / 400 )

    1968 GMC K15/K1500 SUBURBAN

    • CC: 6489
    • Liter: 6.5
    • SubModel: BASE
    • CUI: 396
    • EngineType: V8 ( 6.5 L / 396 )

    2005 GMC C4500 TOPKICK

    • CC: 6599
    • Liter: 8.1
    • SubModel: C4C042
    • CUI: 403
    • EngineType: V8 ( 8.1 L / 403 )

    1958 CHEVROLET IMPALA

    • CC: 5704
    • Liter: 5.7
    • SubModel: BASE
    • CUI: 348
    • EngineType: V8 ( 5.7 L / 348 )

    2005-2006 CHEVROLET SUBURBAN 2500

    • CC: 8128
    • Liter: 8.1
    • SubModel: LT
    • CUI: 496
    • EngineType: V8 ( 8.1 L / 496 )

    1966-1967 CHEVROLET EL CAMINO

    • Liter: 6.5
    • SubModel: BASE
    • CUI: 396
    • EngineType: V8 ( 6.5 L / 396 )

    1994-2000 GMC K2500 PICKUP

    • Liter: 7.4
    • SubModel: SIERRA SLT
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    1999-2000 CHEVROLET K3500 PICKUP

    • Liter: 7.4
    • SubModel: BASE
    • CUI: 454
    • EngineType: V8 ( 7.4 L / 454 )

    2001 CHEVROLET SUBURBAN 2500

    • CC: 8128
    • Liter: 8.1
    • SubModel: BASE
    • CUI: 496
    • EngineType: V8 ( 8.1 L / 496 )

    1969 CHEVROLET K10 SUBURBAN

    • CC: 6489
    • Liter: 6.5
    • SubModel: BASE
    • CUI: 396
    • EngineType: V8 ( 6.5 L / 396 )
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