COMP's Positive Stop PTFE valve seals offer more clearance for dual springs with better sealing than o-ring or umbrella seals. These 503 seals have a .630" outer diameter and fit applications with 11/32" valves and .530" OD valve guides. Catalog User 1
This Part Fits:
Year
Make
Model
Submodel
1986-1987
Buick
Regal
Base
1987
Buick
Regal
GNX
1986-1987
Buick
Regal
Grand National
1986-1987
Buick
Regal
Limited
1986
Buick
Regal
T-Type
1987-2000
Chevrolet
Astro
Base
1987-1995
Chevrolet
Astro
CL
1987-1995
Chevrolet
Astro
CS
1996-2000
Chevrolet
Astro
LS
1987-2000
Chevrolet
Astro
LT
1963-1973
Chevrolet
Bel Air
Base
1963-1972
Chevrolet
Biscayne
Base
1969-1974,1995-1999
Chevrolet
Blazer
Base
1996-2003
Chevrolet
Blazer
LS
1995-2001
Chevrolet
Blazer
LT
1999-2001
Chevrolet
Blazer
Trailblazer
2001-2003
Chevrolet
Blazer
Xtreme
2003
Chevrolet
Blazer
ZR2
1969
Chevrolet
Brookwood
Base
1968-1974
Chevrolet
C10 Suburban
Base
1975-1980
Chevrolet
C10 Suburban
Custom Deluxe
1975-1980
Chevrolet
C10 Suburban
Scottsdale
1975-1980
Chevrolet
C10 Suburban
Silverado
1994-1997
Chevrolet
C1500
Base
1988-1998
Chevrolet
C1500
Cheyenne
1988-1992
Chevrolet
C1500
Scottsdale
1988-1998
Chevrolet
C1500
Silverado
1990-1998
Chevrolet
C1500
WT
1968-1974
Chevrolet
C20 Suburban
Base
1994-1995
Chevrolet
C2500
Base
1988-1995
Chevrolet
C2500
Cheyenne
1988-1992
Chevrolet
C2500
Scottsdale
1988-1995
Chevrolet
C2500
Silverado
1994-1995
Chevrolet
C2500
WT
1967-1979
Chevrolet
Camaro
Base
1979
Chevrolet
Camaro
Berlinetta
1975,1977-1978
Chevrolet
Camaro
LT
1977-1978
Chevrolet
Camaro
LT Rally Sport
1976-1979
Chevrolet
Camaro
Rally Sport
1967-1973,1975
Chevrolet
Camaro
RS
1967-1969,1987-1990
Chevrolet
Caprice
Base
1977-1979,1987-1990,1993
Chevrolet
Caprice
Classic
1987-1988
Chevrolet
Caprice
Classic Brougham
1977-1979
Chevrolet
Caprice
Classic Landau
1987-1988
Chevrolet
Caprice
Classic LS Brougham
1979
Chevrolet
Caprice
Classic Sport
1967-1968
Chevrolet
Chevelle
300
1967-1969
Chevrolet
Chevelle
300 Deluxe
1964-1967,1970-1972
Chevrolet
Chevelle
Base
1967-1972
Chevrolet
Chevelle
Concours
1969-1972
Chevrolet
Chevelle
Concours Estate
1965-1967,1973
Chevrolet
Chevelle
Deluxe
1969-1972
Chevrolet
Chevelle
Greenbrier
1968-1972
Chevrolet
Chevelle
Malibu
1968-1972
Chevrolet
Chevelle
Nomad
1964-1972
Chevrolet
Chevelle
SS
1963-1967
Chevrolet
Chevy II
Base
1963-1968
Chevrolet
Chevy II
Nova
1964-1967
Chevrolet
Chevy II
Nova SS
1964-1977,1987
Chevrolet
El Camino
Base
1975-1977
Chevrolet
El Camino
Classic
1977
Chevrolet
El Camino
Conquista
1968-1974
Chevrolet
El Camino
Custom
1987
Chevrolet
El Camino
SS
1996-2003
Chevrolet
Express 1500
Base
1996-2003
Chevrolet
Express 1500
LS
2001-2002
Chevrolet
Express 1500
LT
1996-2003
Chevrolet
Express 2500
Base
1996-2003
Chevrolet
Express 2500
LS
1983
Chevrolet
G10
Base
1975-1984,1987-1995
Chevrolet
G10
Beauville
1981-1984,1987
Chevrolet
G10
Bonaventure
1975-1984,1987-1995
Chevrolet
G10
Chevy Van
1975-1984,1987-1995
Chevrolet
G10
Sportvan
1964-1967,1969-1974
Chevrolet
G10 Van
Base
1968-1974
Chevrolet
G10 Van
Sportvan
1975,1977-1984,1987-1995
Chevrolet
G20
Beauville
1983-1984
Chevrolet
G20
Bonaventure
1975,1977-1984,1987-1995
Chevrolet
G20
Chevy Van
1978-1981
Chevrolet
G20
Nomad
1978-1984,1987-1995
Chevrolet
G20
Sportvan
1967-1974
Chevrolet
G20 Van
Base
1968-1974
Chevrolet
G20 Van
Sportvan
1976,1978-1979,1981-1984,1987-1995
Chevrolet
G30
Beauville
1983-1984
Chevrolet
G30
Bonaventure
1976,1978-1979,1981-1984,1987-1995
Chevrolet
G30
Chevy Van
1976,1978-1979,1981-1984,1987-1995
Chevrolet
G30
Hi-Cube
1970-1974
Chevrolet
G30 Van
Base
1970-1974
Chevrolet
G30 Van
Sportvan
1963-1973,1977-1979
Chevrolet
Impala
Base
1977
Chevrolet
Impala
Custom
1977-1979
Chevrolet
Impala
Landau
1979
Chevrolet
Impala
Sport
1964-1967
Chevrolet
Impala
SS
1968-1974
Chevrolet
K10 Suburban
Base
1975-1980
Chevrolet
K10 Suburban
Custom Deluxe
1975-1980
Chevrolet
K10 Suburban
Scottsdale
1975-1977,1979-1980
Chevrolet
K10 Suburban
Silverado
1994-1997
Chevrolet
K1500
Base
1988-1998
Chevrolet
K1500
Cheyenne
1988-1992
Chevrolet
K1500
Scottsdale
1988-1998
Chevrolet
K1500
Silverado
1991
Chevrolet
K1500
Sport
1990-1998
Chevrolet
K1500
WT
1968-1974
Chevrolet
K20 Suburban
Base
1994-1995
Chevrolet
K2500
Base
1988-1995
Chevrolet
K2500
Cheyenne
1988-1992
Chevrolet
K2500
Scottsdale
1988-1995
Chevrolet
K2500
Silverado
1994-1995
Chevrolet
K2500
WT
1976
Chevrolet
K5 Blazer
Base
1975-1980
Chevrolet
K5 Blazer
Cheyenne
1981-1982
Chevrolet
K5 Blazer
Custom
1975,1977-1980
Chevrolet
K5 Blazer
Custom Deluxe
1981
Chevrolet
K5 Blazer
Deluxe
1978,1980-1982
Chevrolet
K5 Blazer
Silverado
1964-1967,1973-1977
Chevrolet
Malibu
Base
1974-1977
Chevrolet
Malibu
Classic
1976-1977
Chevrolet
Malibu
Classic Landau
1977
Chevrolet
Malibu
Classic Sport
1973-1974
Chevrolet
Malibu
Estate
1976
Chevrolet
Malibu
Landau
1977
Chevrolet
Malibu
Sport
1987-1988
Chevrolet
Monte Carlo
Base
1987-1988
Chevrolet
Monte Carlo
LS
1969-1979
Chevrolet
Nova
Base
1976-1977
Chevrolet
Nova
Concours
1973-1975,1978-1979
Chevrolet
Nova
Custom
1975
Chevrolet
Nova
LN
1975,1978
Chevrolet
Nova
Police
1977-1979
Chevrolet
Nova
Rally
1987
Chevrolet
R10
Custom Deluxe
1987
Chevrolet
R10
Scottsdale
1987
Chevrolet
R10
Silverado
1987
Chevrolet
R20
Custom Deluxe
1987
Chevrolet
R20
Scottsdale
1987
Chevrolet
R20
Silverado
1991
Chevrolet
S10
Baja
1988-2003
Chevrolet
S10
Base
1988-1990
Chevrolet
S10
Durango
1992-1993
Chevrolet
S10
EL
1994-2003
Chevrolet
S10
LS
1988-1989
Chevrolet
S10
Sport
1994-1998
Chevrolet
S10
SS
1988-1992
Chevrolet
S10
Tahoe
1999-2003
Chevrolet
S10
Xtreme
1994-2003
Chevrolet
S10
ZR2
2002-2003
Chevrolet
S10
ZR5
1988-1994
Chevrolet
S10 Blazer
Base
1988-1989
Chevrolet
S10 Blazer
High Country
1994
Chevrolet
S10 Blazer
LT
1988-1990,1992
Chevrolet
S10 Blazer
Sport
1988,1990-1994
Chevrolet
S10 Blazer
Tahoe
1991-1994
Chevrolet
S10 Blazer
Tahoe LT
1999-2003
Chevrolet
Silverado 1500
Base
1999-2003
Chevrolet
Silverado 1500
LS
1999-2003
Chevrolet
Silverado 1500
LT
2002-2003
Chevrolet
Silverado 1500
WT
1963-1966
Chevrolet
Suburban
Base
1987
Chevrolet
V10
Custom Deluxe
1987
Chevrolet
V10
Scottsdale
1987
Chevrolet
V10
Silverado
1959
Fiat
1100
Base
1976-1977
Ford
F-100
Base
1975-1977,1979
Ford
F-100
Custom
1975-1977
Ford
F-100
Northland
1975-1977,1979
Ford
F-100
Ranger
1979
Ford
F-100
Ranger Lariat
1975-1977,1979
Ford
F-100
Ranger XLT
1977
Ford
F-100
XLT
1976-1978
Ford
F-150
Base
1975-1979
Ford
F-150
Custom
1975-1978
Ford
F-150
Northland
1975-1979
Ford
F-150
Ranger
1978-1979
Ford
F-150
Ranger Lariat
1975-1979
Ford
F-150
Ranger XLT
1977
Ford
F-150
XLT
1976-1978,1983-1986
Ford
F-250
Base
1975-1979,1987-1992
Ford
F-250
Custom
1975-1978
Ford
F-250
Northland
1975-1979
Ford
F-250
Ranger
1978-1979
Ford
F-250
Ranger Lariat
1975-1979
Ford
F-250
Ranger XLT
1983-1994
Ford
F-250
XL
1983
Ford
F-250
XLS
1977,1983-1984,1993-1994
Ford
F-250
XLT
1985-1992
Ford
F-250
XLT Lariat
1976-1978,1983-1986
Ford
F-350
Base
1975-1979,1987-1992
Ford
F-350
Custom
1975-1978
Ford
F-350
Northland
1975-1979
Ford
F-350
Ranger
1978-1979
Ford
F-350
Ranger Lariat
1975-1979
Ford
F-350
Ranger XLT
1983-1994
Ford
F-350
XL
1983
Ford
F-350
XLS
1977,1983-1984,1993-1994
Ford
F-350
XLT
1985-1992
Ford
F-350
XLT Lariat
1975-1978
GMC
C15
Base
1977-1978
GMC
C15
Heavy Half
1975-1978
GMC
C15
High Sierra
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Great Service very knowledgeable staff, my ram is running perfect
Steve Rooney
This company lies to you. Ordered a 02 sensor from APPD for my C7 Vette. Paid the highest possible courier service for the fastest possible shipping from Newcastle to France. I needed the part urgently. Ordered at the weekend and called them Monday to confirm all was in hand and explained the part was required urgently. Response from APPD yes we've recieved the order and will ship as soon as its been processed. Called every day for the next 7 days to be told yes its been shipped and this is the shipping number. Turned out it took them till Friday ..5 days later to post it and then the package lay at the courier another week or so. APPD lied to me throughout this whole transaction. The package cleared customs in 2 days and should have been with me in just over week and not over 4 weeks. APPD offereed the postage refunded after I had to start a PAYPAL dispute.. This should have been a straight forward simple part delivery.When it goes wrong you shouldn't lie to your customer. A serious compay would refund the customer not try to fuzz the truth and blame everyone else. I refused the postage delivery refund so you can buy some honesty pills and discuss with your team how to avoid more negative service feedback. If your thinking of ordering parts from APPD scroll on and find another supplier. You dont need or want the hassle of dealing with these people.
wade Patout
Over a month waiting on parts and all I get is it will scan soon week after week. Reordered from US so I could finish build and same parts arrived in one week. Waiting to see if they will refund??
Gareth weare
placed an order for parts 13th of feb, all listed in stock, got shipping update for label created on the 16th of feb. I have still not received what I ordered and paid for, no updates. I have been getting the same generic answer "order will be fulfilled today" for nearly 2 months now when trying to enquire. Quite disappointing as I have been unable to finish off my car due to waiting on the final fuel system parts for over 2 months now.
PHILIP HYDE
I initially ordered the wrong part but managed to change the order before it was sent out. Lovely product Really well made.
Chris Impey
Made my first purchase with these guys, very helpful and quick replies to my questions.
Delivery was very quick, will be using again
AAAAAA++++++++
Julian Boulter
Brilliant communication, bought parts very difficult to source in the UK, this was the only supplier who managed to get them for me...top service!!!