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.
CatalogUser 1This 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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