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.
This Part Fits:
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 |
- 1969-chevrolet-blazer-base-esi5609095
- 1969-chevrolet-nova-base-esi7573634
- 1970-chevrolet-blazer-base-esi8151367
- 1970-chevrolet-camaro-base-esi5293617
- 1971-chevrolet-blazer-base-esi2666581
- 1971-chevrolet-camaro-base-esi8321578
- 1972-chevrolet-blazer-base-esi3910849
- 1972-chevrolet-camaro-base-esi5559977
- 1973-chevrolet-blazer-base-esi4135725
- 1973-chevrolet-camaro-base-esi5578174
- 1974-chevrolet-blazer-base-esi8401284
- 1974-chevrolet-camaro-base-esi1073549
- 1975-chevrolet-camaro-base-esi7052596
- 1975-chevrolet-camaro-lt-esi2274229
- 1975-chevrolet-camaro-rs-esi6437921
- 1975-chevrolet-el-camino-base-esi5502546
- 1975-chevrolet-el-camino-classic-esi9482507
- 1975-chevrolet-k5-blazer-custom-deluxe-esi8781900
- 1975-gmc-jimmy-base-esi5300356
- 1975-gmc-jimmy-high-sierra-esi2211263
- 1975-gmc-jimmy-sierra-classic-esi6888598
- 1976-chevrolet-camaro-base-esi8826139
- 1976-chevrolet-camaro-rally-sport-esi8846068
- 1976-chevrolet-el-camino-base-esi9781122
- 1976-chevrolet-el-camino-classic-esi3054122
- 1976-gmc-jimmy-base-esi7988244
- 1976-gmc-jimmy-high-sierra-esi9552074
- 1976-gmc-jimmy-sierra-grande-esi5698423
- 1977-chevrolet-camaro-base-esi5948636
- 1977-chevrolet-camaro-lt-esi5341394
- 1977-chevrolet-camaro-lt-rally-sport-esi6530229
- 1977-chevrolet-camaro-rally-sport-esi5456740
- 1977-chevrolet-el-camino-base-esi6604066
- 1977-chevrolet-el-camino-classic-esi6279721
- 1977-chevrolet-el-camino-conquista-esi2960663
- 1977-chevrolet-impala-base-esi5098541
- 1977-chevrolet-impala-custom-esi6514587
- 1977-chevrolet-impala-landau-esi3003083
- 1977-gmc-jimmy-base-esi4111623
- 1977-gmc-jimmy-high-sierra-esi8927385
- 1977-gmc-jimmy-sierra-classic-esi4914498
- 1977-gmc-jimmy-sierra-grande-esi9632665
- 1978-chevrolet-camaro-base-esi5422754
- 1978-chevrolet-camaro-lt-esi2051490
- 1978-chevrolet-camaro-lt-rally-sport-esi9057587
- 1978-chevrolet-camaro-rally-sport-esi8087766
- 1978-chevrolet-impala-base-esi4973366
- 1978-chevrolet-impala-landau-esi9458061
- 1978-gmc-jimmy-base-esi9659462
- 1978-gmc-jimmy-high-sierra-esi8926425
- 1978-gmc-jimmy-sierra-classic-esi1880758
- 1978-gmc-jimmy-street-coupe-esi5004531
- 1979-chevrolet-camaro-base-esi3913956
- 1979-chevrolet-camaro-berlinetta-esi6672513
- 1979-chevrolet-impala-base-esi1579383
- 1979-chevrolet-impala-landau-esi1354994
- 1979-chevrolet-impala-sport-esi6430580
- 1979-gmc-jimmy-base-esi8514401
- 1979-gmc-jimmy-high-sierra-esi2766328
- 1979-gmc-jimmy-sierra-classic-esi3661983
- 1979-gmc-jimmy-sierra-grande-esi8012702
- 1979-gmc-jimmy-street-coupe-esi9011978
- 1979-gmc-k1500-base-esi3781167
- 1979-gmc-k1500-high-sierra-esi7977577
- 1979-gmc-k1500-sierra-grande-esi2605053
- 1980-gmc-jimmy-base-esi8499999
- 1980-gmc-jimmy-high-sierra-esi8135068
- 1980-gmc-jimmy-sierra-classic-esi6346959
- 1980-gmc-jimmy-sierra-grande-esi3417747
- 1980-gmc-jimmy-street-coupe-esi7999545
- 1980-gmc-k1500-base-esi4947591
- 1980-gmc-k1500-high-sierra-esi8216438
- 1980-gmc-k1500-sierra-grande-esi4348375
- 1980-gmc-k2500-base-esi3147326
- 1980-gmc-k2500-high-sierra-esi4732790
- 1981-gmc-jimmy-base-esi6829330
- 1981-gmc-jimmy-high-sierra-esi9679527
- 1981-gmc-jimmy-sierra-classic-esi8266696
- 1981-gmc-jimmy-sierra-grande-esi8664916
- 1981-gmc-jimmy-street-coupe-esi8690576
- 1981-gmc-k1500-base-esi1850325
- 1981-gmc-k1500-high-sierra-esi3476223
- 1981-gmc-k1500-sierra-classic-esi5074870
- 1981-gmc-k1500-sierra-grande-esi3151977
- 1982-gmc-jimmy-base-esi9758287
- 1982-gmc-jimmy-high-sierra-esi6335844
- 1982-gmc-jimmy-sierra-classic-esi2966873
- 1982-gmc-jimmy-sierra-grande-esi1203357
- 1982-gmc-jimmy-street-coupe-esi9396534
- 1982-gmc-k1500-base-esi3323747
- 1982-gmc-k1500-high-sierra-esi4986703
- 1982-gmc-k1500-sierra-classic-esi7998922
- 1982-gmc-k1500-sierra-grande-esi8179509
- 1983-gmc-k1500-base-esi3946723
- 1983-gmc-k1500-high-sierra-esi7932072
- 1983-gmc-k1500-sierra-classic-esi6440489
- 1984-gmc-k1500-base-esi1114603
- 1984-gmc-k1500-high-sierra-esi9069569
- 1984-gmc-k1500-sierra-classic-esi9663326
- 1987-chevrolet-el-camino-base-esi5890560
- 1987-chevrolet-monte-carlo-base-esi9374318
- 1988-chevrolet-monte-carlo-base-esi7050074
- 1988-chevrolet-monte-carlo-ls-esi9333480
- Bucket:Chevy
- Bucket:Ford
- Engine Components>Valve Seals
- EPA:N/A
- LTL:N
- MPN:503-12
- Non-CARB:N
- Prop65:Y
- SpecialOrder:Y