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COMP Cams 503-12

Positive Stop PTFE Seal Guide Size: .530"

COMP Cams 503-12

249-503-12

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Ships directly from the manufacturer
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COMP Cams 503-12 Positive Stop PTFE Seal Guide Size: .530" $16.99
Positive Stop PTFE Seal
  • Guide Size: .530''
  • Valve Size: 11/32''
  • 12/pkg

  • COMP Cams 503-12 Details

    Positive Stop PTFE Seals

  • 1 Year Limited Warranty

  • Specifications:

    Diameter (in.)
    0.34375
    Machine Work Required
    Yes
    Quantity
    Sold as a set of 12
    Valve Guide Diameter (in.)
    0.53
    Valve Stem Diameter (in.)
    0.344
    Valve Stem Seal Material
    PTFE
    Valve Stem Seal Type
    Positive stop
    Manufacturer's Part Number:
    503-12

    Comp Cams offers a complete line of valve stem seals, from the stock GM O-ring to the positive stop PTFE seal. These seals are a must to keep unwanted oil from entering the combustion chamber through the clearance in the valve guides. O-ring seals use the standard retainer and oil splash shield. Umbrella seals are normally used when a larger-than-stock diameter spring is used; in the case of a double spring, positive stop PTFE seals are used. There is also a smaller diameter Viton seal available for triple spring applications. O-rings and umbrella seals require no machining, but PTFE seals require the heads to be disassembled so the top guides can be machined with a special .530" diameter cutter. Whenever you're planning an overhaul or cam change, don't forget the valve seals!

    Features:
  • Excellent Sealing Properties
  • O-Ring & Umbrella Seals Require No Machining

  • Does COMP Cams 503-12 fit your vehicle?

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    Aspiration

    1975-1978 GMC C15 SUBURBAN

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: BASE
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1980 GMC K2500 PICKUP

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: SIERRA GRANDE
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1977 GMC C1500 PICKUP

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: INDY HAULER
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1969-1974 GMC C25/C2500 SUBURBAN

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: BASE
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1996-1997 CHEVROLET EXPRESS 2500

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.3
    • SubModel: LS
    • CUI: 262
    • EngineType: V6 ( 4.3 L / 262 )

    1967-1968 GMC C15/C1500 SUBURBAN

    • CC: 4097
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: BASE
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1994-1995 CHEVROLET K2500 PICKUP

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.3
    • SubModel: WT
    • CUI: 262
    • EngineType: V6 ( 4.3 L / 262 )

    1968-1969 CHEVROLET CHEVELLE

    • CC: 3769
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 3.8
    • SubModel: NOMAD
    • CUI: 230
    • EngineType: L6 ( 3.8 L / 230 )

    1972 CHEVROLET K10 SUBURBAN

    • CC: 4097
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: BASE
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1975-1978 FORD F-250

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 7.5
    • SubModel: NORTHLAND
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )

    1996-2003 CHEVROLET EXPRESS 2500

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.3
    • SubModel: BASE
    • CUI: 262
    • EngineType: V6 ( 4.3 L / 262 )

    1978-1979 CHEVROLET G30 VAN

    • CC: 4097
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: HI-CUBE
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1972-1984 GMC G15/G1500 VAN

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: VANDURA
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1975-1979 FORD F-150

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 7.5
    • SubModel: RANGER
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )

    1976-1977 CHEVROLET MALIBU

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: CLASSIC LANDAU
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1971 CHEVROLET G10 VAN

    • CC: 4097
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: SPORTVAN
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1975-1978 GMC K15 SUBURBAN

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: BASE
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1978 CHEVROLET C10 SUBURBAN

    • CC: 4097
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: BASE
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1968 GMC K35/K3500 PICKUP

    • CC: 4097
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: BASE
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1987 CHEVROLET R10 PICKUP

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.3
    • SubModel: SCOTTSDALE
    • CUI: 262
    • EngineType: V6 ( 4.3 L / 262 )

    1987-1988 CHEVROLET R20 PICKUP

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.3
    • SubModel: CUSTOM DELUXE
    • CUI: 262
    • EngineType: V6 ( 4.3 L / 262 )

    1978-1981 CHEVROLET G20 VAN

    • CC: 4097
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: NOMAD
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1977 FORD F-150

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 7.5
    • SubModel: XLT
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )

    1964-1965 CHEVROLET G10 VAN

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 3.2
    • SubModel: BASE
    • CUI: 194
    • EngineType: L6 ( 3.2 L / 194 )

    1988 CHEVROLET S10 BLAZER

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.3
    • SubModel: TAHOE
    • CUI: 262
    • EngineType: V6 ( 4.3 L / 262 )

    1968-1971 CHEVROLET C10 SUBURBAN

    • CC: 4097
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: BASE
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1979 FORD F-100

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 7.5
    • SubModel: CUSTOM
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )

    1986-1990 FORD F-350

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 7.5
    • SubModel: XL
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )

    1975 GMC C25/C2500 PICKUP

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: HIGH SIERRA
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1967 CHEVROLET CHEVY II

    • CC: 4098
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: BASE
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1987-1988 CHEVROLET CAPRICE

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.3
    • SubModel: CLASSIC
    • CUI: 262
    • EngineType: V6 ( 4.3 L / 262 )

    1976 CHEVROLET MALIBU

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: LANDAU
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    2000-2001 CHEVROLET S10 BLAZER

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • EngineType: ALL
    • SubModel: LT

    1979 CHEVROLET NOVA

    • CC: 4097
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: BASE
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1987 CHEVROLET R20 PICKUP

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.3
    • SubModel: SCOTTSDALE
    • CUI: 262
    • EngineType: V6 ( 4.3 L / 262 )

    1988-1992 CHEVROLET K2500 PICKUP

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.3
    • SubModel: SCOTTSDALE
    • CUI: 262
    • EngineType: V6 ( 4.3 L / 262 )

    1988-1989 CHEVROLET S10 PICKUP

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.3
    • SubModel: SPORT
    • CUI: 262
    • EngineType: V6 ( 4.3 L / 262 )

    1967 GMC C25/C2500 PICKUP

    • CC: 4098
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: BASE
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1969-1971 GMC C25/C2500 PICKUP

    • CC: 4097
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: BASE
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1979-1984 GMC C2500 PICKUP

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: HIGH SIERRA
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1999-2003 CHEVROLET SILVERADO 1500

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.3
    • SubModel: LT
    • CUI: 262
    • EngineType: V6 ( 4.3 L / 262 )

    1983-1984 FORD F-350

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 7.5
    • SubModel: XLT
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )

    1976-1978 FORD F-250

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 7.5
    • SubModel: BASE
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )

    1975-1978 FORD F-350

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 7.5
    • SubModel: NORTHLAND
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )

    1975-1978 CHEVROLET K5 BLAZER

    • CC: 4097
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: CHEYENNE
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1976 CHEVROLET K5 BLAZER

    • CC: 4097
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: BASE
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1987-1995 CHEVROLET G10 VAN

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.3
    • SubModel: BEAUVILLE
    • CUI: 262
    • EngineType: V6 ( 4.3 L / 262 )

    1991-2000 CHEVROLET ASTRO

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • EngineType: ALL
    • SubModel: ALL

    1967-1969 CHEVROLET CAMARO

    • CC: 3769
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 3.8
    • SubModel: BASE
    • CUI: 230
    • EngineType: L6 ( 3.8 L / 230 )

    1979-1980 GMC C1500 SUBURBAN

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: SIERRA CLASSIC
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1987-1989 CHEVROLET G20 VAN

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.3
    • SubModel: SPORTVAN
    • CUI: 262
    • EngineType: V6 ( 4.3 L / 262 )

    1967 CHEVROLET CHEVELLE

    • CC: 4097
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: DELUXE
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1972-1974 CHEVROLET G10 VAN

    • CC: 4098
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: BASE
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1977-1984 CHEVROLET G20 VAN

    • CC: 4097
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: BEAUVILLE
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1999-2002 CHEVROLET SILVERADO 1500

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.3
    • SubModel: BASE
    • CUI: 262
    • EngineType: V6 ( 4.3 L / 262 )

    1975-1982 GMC JIMMY

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: SIERRA CLASSIC
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1987-1995 CHEVROLET G20 VAN

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.3
    • SubModel: BEAUVILLE
    • CUI: 262
    • EngineType: V6 ( 4.3 L / 262 )

    1975-1980 CHEVROLET C10 SUBURBAN

    • CC: 4097
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: CUSTOM DELUXE
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1968 CHEVROLET CHEVY II

    • CC: 3769
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 3.8
    • SubModel: NOVA
    • CUI: 230
    • EngineType: L6 ( 3.8 L / 230 )

    1968-1969 CHEVROLET EL CAMINO

    • CC: 3769
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 3.8
    • SubModel: CUSTOM
    • CUI: 230
    • EngineType: L6 ( 3.8 L / 230 )

    1988-1995 CHEVROLET K2500 PICKUP

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.3
    • SubModel: SILVERADO
    • CUI: 262
    • EngineType: V6 ( 4.3 L / 262 )

    1988-1998 CHEVROLET C1500 PICKUP

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.3
    • SubModel: CHEYENNE
    • CUI: 262
    • EngineType: V6 ( 4.3 L / 262 )

    1979-1980 GMC C1500 SUBURBAN

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: BASE
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1978 GMC C35/C3500 PICKUP

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: HIGH SIERRA
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1969-1974 CHEVROLET NOVA

    • CC: 4098
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: BASE
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1969 CHEVROLET G10 VAN

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 3.8
    • SubModel: BASE
    • CUI: 230
    • EngineType: L6 ( 3.8 L / 230 )

    2001-2003 CHEVROLET S10 BLAZER

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • EngineType: ALL
    • SubModel: XTREME

    1991-1994 OLDSMOBILE BRAVADA

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • EngineType: ALL
    • SubModel: ALL

    1988-1992 CHEVROLET C2500 PICKUP

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.3
    • SubModel: SCOTTSDALE
    • CUI: 262
    • EngineType: V6 ( 4.3 L / 262 )

    1990-1998 CHEVROLET K1500 PICKUP

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.3
    • SubModel: WT
    • CUI: 262
    • EngineType: V6 ( 4.3 L / 262 )

    1967-1968 CHEVROLET CHEVELLE

    • CC: 3769
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 3.8
    • SubModel: 300
    • CUI: 230
    • EngineType: L6 ( 3.8 L / 230 )

    1975-1980 CHEVROLET C10 SUBURBAN

    • CC: 4097
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: SCOTTSDALE
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1975-1979 FORD F-250

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 7.5
    • SubModel: RANGER XLT
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )

    1973-1974 FORD F-350

    • CC: 7539
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 7.5
    • SubModel: BASE
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )

    1979-1980 GMC C35/C3500 PICKUP

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • EngineType: ALL
    • SubModel: ALL

    1965 CHEVROLET CHEVELLE

    • CC: 3180
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 3.2
    • SubModel: SS
    • CUI: 194
    • EngineType: L6 ( 3.2 L / 194 )

    1967 CHEVROLET CHEVELLE

    • CC: 4097
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: 300 DELUXE
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    2003 CHEVROLET SILVERADO 1500

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.3
    • Aspiration: N
    • SubModel: BASE
    • Engine Vin: X
    • CUI: 262
    • EngineType: V6 ( 4.3 L / 262 )

    1993-1994 FORD F-250

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 7.5
    • SubModel: XLT
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )

    1988-1992 CHEVROLET K1500 PICKUP

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.3
    • SubModel: SCOTTSDALE
    • CUI: 262
    • EngineType: V6 ( 4.3 L / 262 )

    1971-1974 GMC G25/G2500 VAN

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: RALLY
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1972 GMC SPRINT

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: CUSTOM
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1975-1977 CHEVROLET K10 SUBURBAN

    • CC: 4097
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: SILVERADO
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1978-1979 CHEVROLET G30 VAN

    • CC: 4097
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: CHEVY VAN
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1983-1986 FORD F-350

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 7.5
    • SubModel: BASE
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )

    1964-1966 CHEVROLET CHEVY II

    • CC: 3769
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 3.8
    • SubModel: NOVA SS
    • CUI: 230
    • EngineType: L6 ( 3.8 L / 230 )

    1977-1979 CHEVROLET IMPALA

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: LANDAU
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1989-1990 CHEVROLET CAPRICE

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.3
    • SubModel: BASE
    • CUI: 262
    • EngineType: V6 ( 4.3 L / 262 )

    1988-1998 CHEVROLET C1500 PICKUP

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.3
    • SubModel: SILVERADO
    • CUI: 262
    • EngineType: V6 ( 4.3 L / 262 )

    1975 GMC C25/C2500 PICKUP

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: SIERRA GRANDE
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1966 CHEVROLET SUBURBAN

    • CC: 4098
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: BASE
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1963-1965 CHEVROLET BEL AIR

    • CC: 3769
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 3.8
    • SubModel: BASE
    • CUI: 230
    • EngineType: L6 ( 3.8 L / 230 )

    1969-1971 GMC C35/C3500 PICKUP

    • CC: 4097
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: BASE
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1971 GMC G35/G3500 VAN

    • CC: 4097
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • Aspiration: N
    • SubModel: RALLY
    • Engine Vin: C
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1979 CHEVROLET CAPRICE

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: CLASSIC SPORT
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1975-1976 GMC SPRINT

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: SP
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1970-1973 CHEVROLET EL CAMINO

    • CC: 4098
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: CUSTOM
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1979 FORD F-100

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 7.5
    • SubModel: RANGER LARIAT
    • CUI: 460
    • EngineType: V8 ( 7.5 L / 460 )

    1982-1984 GMC G35/G3500 VAN

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: VANDURA SPECIAL
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )

    1967-1973 CHEVROLET CAMARO

    • CC: 4098
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.1
    • SubModel: BASE
    • CUI: 250
    • EngineType: L6 ( 4.1 L / 250 )
    Items You Need
    Some parts are not legal for use in California or other states with similar laws / regulations