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-esi8408810
- 1969-chevrolet-nova-base-esi2040014
- 1970-chevrolet-blazer-base-esi8175550
- 1970-chevrolet-camaro-base-esi9302257
- 1971-chevrolet-blazer-base-esi7029971
- 1971-chevrolet-camaro-base-esi6121098
- 1972-chevrolet-blazer-base-esi3606945
- 1972-chevrolet-camaro-base-esi9090997
- 1973-chevrolet-blazer-base-esi8082682
- 1973-chevrolet-camaro-base-esi5841670
- 1974-chevrolet-blazer-base-esi9792274
- 1974-chevrolet-camaro-base-esi3995319
- 1975-chevrolet-camaro-base-esi2696172
- 1975-chevrolet-camaro-lt-esi1439738
- 1975-chevrolet-camaro-rs-esi3451863
- 1975-chevrolet-el-camino-base-esi9668774
- 1975-chevrolet-el-camino-classic-esi9562711
- 1975-chevrolet-k5-blazer-custom-deluxe-esi2729744
- 1975-gmc-jimmy-base-esi9870575
- 1975-gmc-jimmy-high-sierra-esi3462776
- 1975-gmc-jimmy-sierra-classic-esi1139907
- 1976-chevrolet-camaro-base-esi7571795
- 1976-chevrolet-camaro-rally-sport-esi8272561
- 1976-chevrolet-el-camino-base-esi3892907
- 1976-chevrolet-el-camino-classic-esi9129995
- 1976-gmc-jimmy-base-esi8692926
- 1976-gmc-jimmy-high-sierra-esi1655261
- 1976-gmc-jimmy-sierra-grande-esi7043268
- 1977-chevrolet-camaro-base-esi1679391
- 1977-chevrolet-camaro-lt-esi7652990
- 1977-chevrolet-camaro-lt-rally-sport-esi9596410
- 1977-chevrolet-camaro-rally-sport-esi2293683
- 1977-chevrolet-el-camino-base-esi7688583
- 1977-chevrolet-el-camino-classic-esi2311632
- 1977-chevrolet-el-camino-conquista-esi5536392
- 1977-chevrolet-impala-base-esi3183573
- 1977-chevrolet-impala-custom-esi9065003
- 1977-chevrolet-impala-landau-esi3109491
- 1977-gmc-jimmy-base-esi8051586
- 1977-gmc-jimmy-high-sierra-esi2137797
- 1977-gmc-jimmy-sierra-classic-esi5496100
- 1977-gmc-jimmy-sierra-grande-esi6716037
- 1978-chevrolet-camaro-base-esi2931536
- 1978-chevrolet-camaro-lt-esi6749176
- 1978-chevrolet-camaro-lt-rally-sport-esi5899556
- 1978-chevrolet-camaro-rally-sport-esi2090624
- 1978-chevrolet-impala-base-esi3302883
- 1978-chevrolet-impala-landau-esi4422667
- 1978-gmc-jimmy-base-esi1615671
- 1978-gmc-jimmy-high-sierra-esi3983830
- 1978-gmc-jimmy-sierra-classic-esi5725020
- 1978-gmc-jimmy-street-coupe-esi7208204
- 1979-chevrolet-camaro-base-esi5916631
- 1979-chevrolet-camaro-berlinetta-esi6335503
- 1979-chevrolet-impala-base-esi5633009
- 1979-chevrolet-impala-landau-esi5121110
- 1979-chevrolet-impala-sport-esi7594564
- 1979-gmc-jimmy-base-esi3698996
- 1979-gmc-jimmy-high-sierra-esi7730446
- 1979-gmc-jimmy-sierra-classic-esi9114805
- 1979-gmc-jimmy-sierra-grande-esi5101717
- 1979-gmc-jimmy-street-coupe-esi1174860
- 1979-gmc-k1500-base-esi7315804
- 1979-gmc-k1500-high-sierra-esi6690803
- 1979-gmc-k1500-sierra-grande-esi4979681
- 1980-gmc-jimmy-base-esi8747225
- 1980-gmc-jimmy-high-sierra-esi3152542
- 1980-gmc-jimmy-sierra-classic-esi6747417
- 1980-gmc-jimmy-sierra-grande-esi4007839
- 1980-gmc-jimmy-street-coupe-esi5491998
- 1980-gmc-k1500-base-esi5562372
- 1980-gmc-k1500-high-sierra-esi9104965
- 1980-gmc-k1500-sierra-grande-esi1477255
- 1980-gmc-k2500-base-esi1763771
- 1980-gmc-k2500-high-sierra-esi5024004
- 1981-gmc-jimmy-base-esi6972358
- 1981-gmc-jimmy-high-sierra-esi6301353
- 1981-gmc-jimmy-sierra-classic-esi4270765
- 1981-gmc-jimmy-sierra-grande-esi1503681
- 1981-gmc-jimmy-street-coupe-esi2392681
- 1981-gmc-k1500-base-esi2236333
- 1981-gmc-k1500-high-sierra-esi9311155
- 1981-gmc-k1500-sierra-classic-esi3546284
- 1981-gmc-k1500-sierra-grande-esi4654134
- 1982-gmc-jimmy-base-esi3905195
- 1982-gmc-jimmy-high-sierra-esi2531483
- 1982-gmc-jimmy-sierra-classic-esi5137198
- 1982-gmc-jimmy-sierra-grande-esi2023121
- 1982-gmc-jimmy-street-coupe-esi4274454
- 1982-gmc-k1500-base-esi3989756
- 1982-gmc-k1500-high-sierra-esi4667766
- 1982-gmc-k1500-sierra-classic-esi1524610
- 1982-gmc-k1500-sierra-grande-esi2260729
- 1983-gmc-k1500-base-esi2710335
- 1983-gmc-k1500-high-sierra-esi6803735
- 1983-gmc-k1500-sierra-classic-esi1925498
- 1984-gmc-k1500-base-esi9346249
- 1984-gmc-k1500-high-sierra-esi8391044
- 1984-gmc-k1500-sierra-classic-esi9968085
- 1987-chevrolet-el-camino-base-esi1719011
- 1987-chevrolet-el-camino-ss-esi9190840
- 1987-chevrolet-monte-carlo-base-esi8718167
- 1987-chevrolet-monte-carlo-ls-esi7049807
- 1988-chevrolet-monte-carlo-base-esi8118531
- 1988-chevrolet-monte-carlo-ls-esi1696446
- Bucket:Chevy
- Bucket:Ford
- Engine Components>Valve Seals
- EPA:N/A
- LTL:N
- MPN:503-12
- Non-CARB:N
- Prop65:Y
- SpecialOrder:Y
