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COMP Cams 503-16

Positive Stop PTFE Seals Guide Size: .530"



COMP Cams 503-16

Part Number: 249-503-16

Positive Stop PTFE Seals
  • Guide Size: .530''
  • Valve Size: 11/32''
  • 16/pkg
  • $27.47
    Ships
    COMP Cams 503-16 Positive Stop PTFE Seals Guide Size: .530" $27.47

    COMP Cams 503-16 Details

    Positive Stop PTFE Seals

  • 1 Year Limited Warranty

  • Specifications:

    Diameter (in.)
    0.34375
    Machine Work Required
    Yes
    Quantity
    Sold as a set of 16
    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:
    503-16

    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 503-16 fit your vehicle?

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    1980-1981 OLDSMOBILE CUTLASS CRUISER

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.0
    • SubModel: BROUGHAM
    • EngineType: V8

    1974 PONTIAC BONNEVILLE

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 6.6
    • SubModel: BASE
    • CUI: 400
    • EngineType: V8

    1968 OLDSMOBILE VISTA CRUISER

    • CC: 5733
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • SubModel: BASE
    • CUI: 350
    • EngineType: V8

    1979 CADILLAC DEVILLE

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 7.0
    • SubModel: BASE
    • EngineType: V8

    1978-1980 GMC C1500 PICKUP

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.0
    • SubModel: HEAVY HALF
    • EngineType: V8

    1968-1974 FORD E-200 ECONOLINE

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • EngineType: V8
    • SubModel: CLUB WAGON

    1981-1986 CHEVROLET C20 PICKUP

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • SubModel: CUSTOM
    • EngineType: V8

    1984-1986 CHEVROLET C10 SUBURBAN

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • SubModel: SCOTTSDALE
    • EngineType: V8

    1979-1980 GMC K1500 PICKUP

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 6.6
    • SubModel: SIERRA GRANDE
    • EngineType: V8

    1972-1973 PONTIAC VENTURA

    • CC: 5733
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • SubModel: BASE
    • EngineType: V8

    1985-1986 PONTIAC BONNEVILLE

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • EngineType: V8
    • SubModel: BROUGHAM

    1985-1986 PONTIAC BONNEVILLE

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • EngineType: V8
    • SubModel: LE

    1974 PONTIAC GRANDVILLE

    • CC: 7457
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 7.5
    • SubModel: BASE
    • CUI: 455
    • EngineType: V8

    1975-1977 GMC C15 SUBURBAN

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • SubModel: BASE
    • EngineType: V8

    1977-1978 FORD F-100

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.8
    • SubModel: CUSTOM
    • EngineType: V8

    1986 FORD LTD

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

    1974 GMC SPRINT

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 6.6
    • SubModel: CUSTOM
    • CUI: 400
    • EngineType: V8

    1971 FORD TORINO

    • CC: 5752
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.8
    • SubModel: BROUGHAM
    • CUI: 351
    • EngineType: V8

    1984 BUICK ELECTRA

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • EngineType: V8
    • SubModel: PARK AVENUE

    1969 CHEVROLET EL CAMINO

    • CC: 5736
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • SubModel: BASE
    • CUI: 350
    • EngineType: V8

    1979-1980 OLDSMOBILE TORONADO

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • SubModel: BROUGHAM
    • CUI: 350
    • EngineType: V8

    1979-1981 FORD F-350

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • EngineType: V8
    • SubModel: RANGER XLT

    1979 BUICK RIVIERA

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

    1988-1993 GMC C1500 PICKUP

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • SubModel: SIERRA SLX
    • EngineType: V8

    1995 FORD F-250

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.0
    • SubModel: SPECIAL
    • EngineType: V8

    1970 FORD FALCON

    • CC: 7030
    • Liter: 7.0
    • Aspiration: N
    • SubModel: FUTURA
    • Engine Vin: C
    • CUI: 429
    • EngineType: V8

    1968-1972 OLDSMOBILE F85

    • CC: 5737
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • SubModel: BASE
    • CUI: 350
    • EngineType: V8

    1982-1986 CHEVROLET K20 PICKUP

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • SubModel: CUSTOM
    • EngineType: V8

    1987-1991 GMC R2500 SUBURBAN

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • SubModel: BASE
    • EngineType: V8

    1979-1980 FORD E-150 ECONOLINE

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.8
    • SubModel: CHATEAU
    • EngineType: V8

    1987-1989 CADILLAC BROUGHAM

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

    1985-1987 PONTIAC GRAND PRIX

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • EngineType: V8
    • SubModel: BASE

    1970-1971 OLDSMOBILE TORONADO

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

    1971 FORD COUNTRY SEDAN

    • CC: 7030
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 7.0
    • SubModel: BASE
    • CUI: 429
    • EngineType: V8

    1968 GMC K35/K3500 PICKUP

    • CC: 5031
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.0
    • SubModel: BASE
    • CUI: 307
    • EngineType: V8

    1971 FORD TORINO

    • CC: 5752
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.8
    • Aspiration: N
    • SubModel: BROUGHAM
    • Engine Vin: M
    • CUI: 351
    • EngineType: V8

    1987-1988 CHEVROLET R20 SUBURBAN

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • SubModel: SCOTTSDALE
    • EngineType: V8

    1983 PONTIAC GRAND PRIX

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.0
    • SubModel: LJ
    • EngineType: V8

    1975-1983 FORD E-250 ECONOLINE CLUB WAGON

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.8
    • SubModel: CUSTOM
    • EngineType: V8

    1983-1995 GMC G25/G2500 VAN

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.0
    • SubModel: VANDURA
    • EngineType: V8

    1980 GMC K2500 SUBURBAN

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • Aspiration: N
    • SubModel: BASE
    • Engine Vin: L
    • CUI: 350
    • EngineType: V8

    1972-1974 PONTIAC VENTURA

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • SubModel: BASE
    • CUI: 350
    • EngineType: V8

    1977-1979 CHEVROLET IMPALA

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • EngineType: V8
    • SubModel: BASE

    1978-1979 PONTIAC CATALINA

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 6.6
    • SubModel: SAFARI
    • EngineType: V8

    1971 FORD RANCHERO

    • CC: 5752
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.8
    • SubModel: 500
    • CUI: 351
    • EngineType: V8

    1975 CHEVROLET G10 VAN

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • EngineType: V8
    • SubModel: BEAUVILLE

    1984 FORD MUSTANG

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • EngineType: V8
    • SubModel: GT

    1972-1973 OLDSMOBILE DELTA 88

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • SubModel: ROYALE
    • CUI: 350
    • EngineType: V8

    1970 FORD GALAXIE 500

    • CC: 7030
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 7.0
    • SubModel: XL
    • EngineType: V8

    1968 GMC K15/K1500 SUBURBAN

    • CC: 5031
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.0
    • SubModel: BASE
    • CUI: 307
    • EngineType: V8

    1970-1978 CHEVROLET G30 VAN

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • EngineType: V8
    • SubModel: SPORTVAN

    1974 CHEVROLET CAMARO

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • Aspiration: N
    • SubModel: BASE
    • Engine Vin: L
    • CUI: 350
    • EngineType: V8

    1976-1977 OLDSMOBILE OMEGA

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.3
    • SubModel: F85
    • CUI: 260
    • EngineType: V8

    1964 FORD FALCON SEDAN DELIVERY

    • Liter: 4.3
    • EngineType: V8
    • SubModel: BASE

    1984 FORD E-150 ECONOLINE

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.0
    • SubModel: BASE
    • EngineType: V8

    1995 GMC K1500 PICKUP

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.0
    • SubModel: SIERRA SLE
    • EngineType: V8

    1977 FORD F-350

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.8
    • SubModel: XLT
    • EngineType: V8

    1992 CHEVROLET CAMARO

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • EngineType: ALL
    • SubModel: Z28 HERITAGE EDITION

    1970-1971 FORD TORINO

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.0
    • SubModel: BROUGHAM
    • EngineType: V8

    1967 CHEVROLET SUBURBAN

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.6
    • SubModel: BASE
    • EngineType: V8

    1987-1988 CHEVROLET R30 PICKUP

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • SubModel: SILVERADO
    • EngineType: V8

    1987 CHEVROLET BLAZER

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.0
    • SubModel: CUSTOM DELUXE
    • EngineType: V8

    1972-1973 PONTIAC GRAND PRIX

    • CC: 6556
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 6.6
    • Aspiration: N
    • SubModel: BASE
    • Engine Vin: S
    • CUI: 400
    • EngineType: V8

    1969-1970 MERCURY MARAUDER

    • CC: 7014
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 7.0
    • SubModel: X-100
    • CUI: 428
    • EngineType: V8

    1975-1977 OLDSMOBILE 98

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

    1980-1984 OLDSMOBILE 98

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.0
    • SubModel: REGENCY
    • EngineType: V8

    1995 FORD F-150

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • EngineType: V8
    • SubModel: SPECIAL

    1979 GMC K1500 PICKUP

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.0
    • SubModel: HIGH SIERRA
    • EngineType: V8

    1972 CHEVROLET CHEVELLE

    • CC: 5736
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • SubModel: BASE
    • CUI: 350
    • EngineType: V8

    1979 CHEVROLET CAPRICE

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • SubModel: CLASSIC
    • CUI: 350
    • EngineType: V8

    1969-1970 CHEVROLET C20 PICKUP

    • CC: 5736
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • SubModel: BASE
    • CUI: 350
    • EngineType: V8

    1978-1979 CHEVROLET C10 PICKUP

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • SubModel: BIG TEN
    • CUI: 350
    • EngineType: V8

    1969-1972 MERCURY MONTEREY

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 7.0
    • SubModel: CUSTOM
    • CUI: 429
    • EngineType: V8

    1977-1981 GMC JIMMY

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • EngineType: V8
    • SubModel: BASE

    1994-1995 CHEVROLET K2500 PICKUP

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • SubModel: SILVERADO
    • EngineType: V8

    1965 PONTIAC TEMPEST

    • CC: 5343
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.3
    • Aspiration: N
    • SubModel: SAFARI
    • CUI: 326
    • EngineType: V8

    1984 FORD F-150

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.8
    • SubModel: XL
    • EngineType: V8

    1995 FORD F-250

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.0
    • Aspiration: N
    • SubModel: XL
    • Engine Vin: N
    • CUI: 302
    • EngineType: V8

    1974 PONTIAC LEMANS

    • CC: 5737
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • SubModel: BASE
    • CUI: 350
    • EngineType: V8

    1968-1969 CHEVROLET EL CAMINO

    • CC: 5031
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.0
    • SubModel: BASE
    • CUI: 307
    • EngineType: V8

    1995 GMC K1500 PICKUP

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.0
    • SubModel: SIERRA SPECIAL
    • EngineType: V8

    1977-1978 CHEVROLET CAMARO

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • EngineType: V8
    • SubModel: LT RALLY SPORT

    1965-1966 CHEVROLET CHEVELLE

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • EngineType: V8
    • SubModel: DELUXE

    1977-1979 OLDSMOBILE STARFIRE

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • EngineType: V8
    • SubModel: GT

    1988-1993 GMC K2500 PICKUP

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.0
    • SubModel: SIERRA
    • EngineType: V8

    1980 FORD E-100 ECONOLINE

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.0
    • SubModel: CHATEAU
    • EngineType: V8

    1978-1980 OLDSMOBILE 98

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • SubModel: REGENCY
    • CUI: 350
    • EngineType: V8

    1981-1983 CHEVROLET IMPALA

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • SubModel: BASE
    • CUI: 350
    • EngineType: V8

    1964-1965 FORD MUSTANG

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.7
    • SubModel: BASE
    • EngineType: V8

    1978-1980 PONTIAC BONNEVILLE

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.9
    • SubModel: SAFARI
    • EngineType: V8

    1976 PONTIAC CATALINA

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

    1980 FORD GRANADA

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.0
    • SubModel: ESS
    • EngineType: V8

    1992-1994 GMC K1500 SUBURBAN

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

    1985-1987 GMC CABALLERO

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • EngineType: V8
    • SubModel: BASE

    1991-1992 CHEVROLET CAMARO

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • SubModel: Z28
    • CUI: 350
    • EngineType: V8

    1969 OLDSMOBILE 442

    • CC: 6555
    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 6.6
    • Aspiration: N
    • SubModel: BASE
    • CUI: 400
    • EngineType: V8

    1969 CHEVROLET CAMARO

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 5.7
    • SubModel: RS
    • EngineType: V8

    1995 FORD BRONCO

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

    1964-1967 CHEVROLET MALIBU

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.6
    • SubModel: BASE
    • EngineType: V8

    1964 FORD FALCON

    • Fitment_Note: Requires Machining On Cylinder Heads~50-State Legal
    • Liter: 4.7
    • SubModel: FUTURA SPRINT
    • EngineType: V8
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