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 |
|---|---|---|---|
| 1980-1981 | Buick | Century | Base |
| 1982-1989 | Buick | Century | Custom |
| 1980-1981,1984 | Buick | Century | Estate |
| 1985-1989 | Buick | Century | Estate Wagon |
| 1980-1989 | Buick | Century | Limited |
| 1984 | Buick | Century | Olympia Limited |
| 1980-1981 | Buick | Century | Sport |
| 1980-1987 | Buick | Electra | Estate Wagon |
| 1980-1984 | Buick | Electra | Limited |
| 1980-1984 | Buick | Electra | Park Avenue |
| 1980-1983 | Buick | Estate Wagon | Base |
| 1980-1981 | Buick | LeSabre | Base |
| 1985 | Buick | LeSabre | Collector's Edition |
| 1982-1985 | Buick | LeSabre | Custom |
| 1985-1990 | Buick | LeSabre | Estate Wagon |
| 1980-1985 | Buick | LeSabre | Limited |
| 1982 | Buick | LeSabre | Limited Edition F/E |
| 1981 | Buick | LeSabre | Sport |
| 1980-1981,1986-1987 | Buick | Regal | Base |
| 1980-1981,1986-1987 | Buick | Regal | Limited |
| 1980-1985 | Buick | Riviera | Base |
| 1982 | Buick | Riviera | Limited Edition |
| 1983-1985 | Buick | Riviera | Luxury |
| 1980 | Buick | Riviera | S |
| 1981 | Buick | Riviera | T-Type |
| 1983 | Buick | Riviera | XX Anniversary Edition |
| 1980-1982 | Buick | Skylark | Base |
| 1983-1989 | Buick | Skylark | Custom |
| 1980-1989 | Buick | Skylark | Limited |
| 1980-1982 | Buick | Skylark | Sport |
| 1986-1987 | Buick | Somerset | Custom |
| 1986-1987 | Buick | Somerset | Limited |
| 1986 | Buick | Somerset | T-Type |
| 1985 | Buick | Somerset Regal | Base |
| 1985 | Buick | Somerset Regal | Limited |
| 1987-1990 | Cadillac | Brougham | Base |
| 1987-1990 | Cadillac | Brougham | d'Elegance |
| 1986 | Cadillac | Fleetwood | Brougham |
| 1986 | Cadillac | Fleetwood | Brougham d'Elegance |
| 1985-1989 | Chevrolet | Astro | Base |
| 1985-1989 | Chevrolet | Astro | CL |
| 1985-1989 | Chevrolet | Astro | CS |
| 1987-1989 | Chevrolet | Astro | LT |
| 1994 | Chevrolet | Blazer | Base |
| 1992-1993 | Chevrolet | Blazer | Cheyenne |
| 1987 | Chevrolet | Blazer | Custom Deluxe |
| 1988-1991 | Chevrolet | Blazer | Scottsdale |
| 1987-1994 | Chevrolet | Blazer | Silverado |
| 1994 | Chevrolet | Blazer | Silverado Sport |
| 1980 | Chevrolet | C10 | Big Ten |
| 1980-1981 | Chevrolet | C10 | Cheyenne |
| 1981-1986 | Chevrolet | C10 | Custom |
| 1980 | Chevrolet | C10 | Custom Deluxe |
| 1981 | Chevrolet | C10 | Deluxe |
| 1980-1986 | Chevrolet | C10 | Scottsdale |
| 1980-1986 | Chevrolet | C10 | Silverado |
| 1981-1986 | Chevrolet | C10 Suburban | Custom |
| 1980 | Chevrolet | C10 Suburban | Custom Deluxe |
| 1981 | Chevrolet | C10 Suburban | Deluxe |
| 1980,1982,1984-1986 | Chevrolet | C10 Suburban | Scottsdale |
| 1980,1982-1986 | Chevrolet | C10 Suburban | Silverado |
| 1994-1995 | Chevrolet | C1500 | Base |
| 1988-1995 | Chevrolet | C1500 | Cheyenne |
| 1988-1992 | Chevrolet | C1500 | Scottsdale |
| 1988-1995 | Chevrolet | C1500 | Silverado |
| 1990-1995 | Chevrolet | C1500 | WT |
| 1992-1995 | Chevrolet | C1500 Suburban | Base |
| 1995 | Chevrolet | C1500 Suburban | LS |
| 1995 | Chevrolet | C1500 Suburban | LT |
| 1992-1994 | Chevrolet | C1500 Suburban | Silverado |
| 1980-1981 | Chevrolet | C20 | Cheyenne |
| 1981-1986 | Chevrolet | C20 | Custom |
| 1980 | Chevrolet | C20 | Custom Deluxe |
| 1981 | Chevrolet | C20 | Deluxe |
| 1980-1986 | Chevrolet | C20 | Scottsdale |
| 1980-1986 | Chevrolet | C20 | Silverado |
| 1981-1986 | Chevrolet | C20 Suburban | Custom |
| 1980 | Chevrolet | C20 Suburban | Custom Deluxe |
| 1981 | Chevrolet | C20 Suburban | Deluxe |
| 1980,1982,1984-1986 | Chevrolet | C20 Suburban | Scottsdale |
| 1980,1982-1986 | Chevrolet | C20 Suburban | Silverado |
| 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 |
| 1992-1995 | Chevrolet | C2500 Suburban | Base |
| 1995 | Chevrolet | C2500 Suburban | LS |
| 1995 | Chevrolet | C2500 Suburban | LT |
| 1992-1994 | Chevrolet | C2500 Suburban | Silverado |
| 1980-1981 | Chevrolet | C30 | Cheyenne |
| 1981-1986 | Chevrolet | C30 | Custom |
| 1980 | Chevrolet | C30 | Custom Deluxe |
| 1981 | Chevrolet | C30 | Deluxe |
| 1980-1986 | Chevrolet | C30 | Scottsdale |
| 1980-1986 | Chevrolet | C30 | Silverado |
| 1994-1995 | Chevrolet | C3500 | Base |
| 1988-1995 | Chevrolet | C3500 | Cheyenne |
| 1988-1992 | Chevrolet | C3500 | Scottsdale |
| 1988-1995 | Chevrolet | C3500 | Silverado |
| 1980,1988 | Chevrolet | Camaro | Base |
| 1980-1986 | Chevrolet | Camaro | Berlinetta |
| 1985-1990 | Chevrolet | Camaro | Iroc-Z |
| 1987 | Chevrolet | Camaro | LT |
| 1980 | Chevrolet | Camaro | Rally Sport |
| 1989-1992 | Chevrolet | Camaro | RS |
| 1992 | Chevrolet | Camaro | RS Heritage Edition |
| 1981-1987 | Chevrolet | Camaro | Sport |
| 1980-1987,1991-1992 | Chevrolet | Camaro | Z28 |
| 1992 | Chevrolet | Camaro | Z28 Heritage Edition |
| 1982 | Chevrolet | Camaro | Z28 Indianapolis 500 Pace Car |
| 1986-1992 | Chevrolet | Caprice | Base |
| 1980-1993 | Chevrolet | Caprice | Classic |
| 1986-1990 | Chevrolet | Caprice | Classic Brougham |
| 1981-1982 | Chevrolet | Caprice | Classic Estate |
| 1980-1981 | Chevrolet | Caprice | Classic Landau |
| 1993 | Chevrolet | Caprice | Classic LS |
| 1987-1990 | Chevrolet | Caprice | Classic LS Brougham |
| 1991-1993 | Chevrolet | Caprice | Classic LTZ |
| 1980 | Chevrolet | Caprice | Classic Sport |
| 1982-1989 | Chevrolet | Celebrity | Base |
| 1982-1983,1989 | Chevrolet | Celebrity | CL |
| 1985 | Chevrolet | Celebrity | Classic |
| 1982 | Chevrolet | Celebrity | CS |
| 1985-1987 | Chevrolet | Celebrity | Estate |
| 1984-1989 | Chevrolet | Celebrity | Eurosport |
| 1980-1983 | Chevrolet | Citation | Base |
| 1980 | Chevrolet | Citation | Club |
| 1980 | Chevrolet | Citation | Custom |
| 1980-1983 | Chevrolet | Citation | X-11 |
| 1984-1985 | Chevrolet | Citation II | Base |
| 1984-1985 | Chevrolet | Citation II | X-11 |
| 1988 | Chevrolet | Corvette | 35th Anniversary Edition |
| 1980-1982,1984-1991 | Chevrolet | Corvette | Base |
| 1982 | Chevrolet | Corvette | Collector's Edition |
| 1986 | Chevrolet | Corvette | Indianapolis 500 Pace Car |
| 1990-1991 | Chevrolet | Corvette | ZR-1 |
| 1980-1987 | Chevrolet | El Camino | Base |
| 1981-1986 | Chevrolet | El Camino | Conquista |
| 1980-1981 | Chevrolet | El Camino | Royal Knight |
| 1980-1987 | Chevrolet | El Camino | SS |
| 1983 | Chevrolet | G10 | Base |
| 1980-1995 | Chevrolet | G10 | Beauville |
| 1981-1984,1986-1987 | Chevrolet | G10 | Bonaventure |
| 1980-1995 | Chevrolet | G10 | Chevy Van |
| 1980-1995 | Chevrolet | G10 | Sportvan |
| 1980-1995 | Chevrolet | G20 | Beauville |
| 1983-1984 | Chevrolet | G20 | Bonaventure |
| 1980-1995 | Chevrolet | G20 | Chevy Van |
| 1980-1981 | Chevrolet | G20 | Nomad |
| 1980-1995 | Chevrolet | G20 | Sportvan |
| 1980-1996 | Chevrolet | G30 | Beauville |
| 1983-1984 | Chevrolet | G30 | Bonaventure |
| 1980-1996 | Chevrolet | G30 | Chevy Van |
| 1980-1996 | Chevrolet | G30 | Hi-Cube |
| 1980-1996 | Chevrolet | G30 | Sportvan |
| 1980-1985 | Chevrolet | Impala | Base |
| 1981-1982 | Chevrolet | Impala | Estate |
| 1980 | Chevrolet | Impala | Sport |
| 1980-1981 | Chevrolet | K10 | Cheyenne |
| 1981-1986 | Chevrolet | K10 | Custom |
| 1980 | Chevrolet | K10 | Custom Deluxe |
| 1981 | Chevrolet | K10 | Deluxe |
| 1980-1986 | Chevrolet | K10 | Scottsdale |
| 1980-1986 | Chevrolet | K10 | Silverado |
| 1981-1986 | Chevrolet | K10 Suburban | Custom |
| 1980 | Chevrolet | K10 Suburban | Custom Deluxe |
| 1981 | Chevrolet | K10 Suburban | Deluxe |
| 1980,1982,1984-1986 | Chevrolet | K10 Suburban | Scottsdale |
| 1980,1982-1983,1985-1986 | Chevrolet | K10 Suburban | Silverado |
| 1994-1995 | Chevrolet | K1500 | Base |
| 1988-1995 | Chevrolet | K1500 | Cheyenne |
| 1988-1992 | Chevrolet | K1500 | Scottsdale |
| 1988-1995 | Chevrolet | K1500 | Silverado |
| 1991 | Chevrolet | K1500 | Sport |
| 1990-1995 | Chevrolet | K1500 | WT |
| 1992-1995 | Chevrolet | K1500 Suburban | Base |
| 1995 | Chevrolet | K1500 Suburban | LS |
| 1995 | Chevrolet | K1500 Suburban | LT |
| 1992-1994 | Chevrolet | K1500 Suburban | Silverado |
| 1980-1981 | Chevrolet | K20 | Cheyenne |
| 1981-1986 | Chevrolet | K20 | Custom |
| 1980 | Chevrolet | K20 | Custom Deluxe |
| 1981 | Chevrolet | K20 | Deluxe |
| 1980-1986 | Chevrolet | K20 | Scottsdale |
| 1980-1983,1985-1986 | Chevrolet | K20 | Silverado |
| 1981-1986 | Chevrolet | K20 Suburban | Custom |
| 1980 | Chevrolet | K20 Suburban | Custom Deluxe |
| 1981 | Chevrolet | K20 Suburban | Deluxe |
| 1980,1982,1984-1986 | Chevrolet | K20 Suburban | Scottsdale |
| 1980,1982-1983,1985-1986 | Chevrolet | K20 Suburban | Silverado |
| 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 |
| 1992-1995 | Chevrolet | K2500 Suburban | Base |
| 1995 | Chevrolet | K2500 Suburban | LS |
| 1995 | Chevrolet | K2500 Suburban | LT |
| 1992-1994 | Chevrolet | K2500 Suburban | Silverado |
- 1980-chevrolet-camaro-base-esi6547301
- 1980-chevrolet-camaro-berlinetta-esi4536287
- 1980-chevrolet-camaro-z28-esi3913618
- 1980-chevrolet-k10-cheyenne-esi1310403
- 1980-chevrolet-k10-custom-deluxe-esi4777979
- 1980-chevrolet-k10-scottsdale-esi2292059
- 1980-chevrolet-k10-silverado-esi8358776
- 1980-chevrolet-k20-cheyenne-esi4227429
- 1980-chevrolet-k20-custom-deluxe-esi1817004
- 1980-chevrolet-k20-scottsdale-esi9865828
- 1980-chevrolet-k20-silverado-esi4331923
- 1980-pontiac-firebird-formula-esi1526827
- 1980-pontiac-firebird-trans-am-esi1431638
- 1981-chevrolet-camaro-berlinetta-esi3736839
- 1981-chevrolet-camaro-sport-esi2161493
- 1981-chevrolet-camaro-z28-esi9546223
- 1981-chevrolet-k10-custom-esi6430453
- 1981-chevrolet-k10-deluxe-esi8745633
- 1981-chevrolet-k20-custom-esi9825166
- 1981-chevrolet-k20-deluxe-esi3930820
- 1981-pontiac-firebird-formula-esi5607077
- 1981-pontiac-firebird-trans-am-esi4326686
- 1982-chevrolet-k10-custom-esi3286429
- 1982-chevrolet-k10-scottsdale-esi1600602
- 1982-chevrolet-k10-silverado-esi8334462
- 1982-chevrolet-k20-custom-esi3303917
- 1982-chevrolet-k20-scottsdale-esi7131634
- 1982-chevrolet-k20-silverado-esi6856484
- 1983-chevrolet-k10-custom-esi6404174
- 1983-chevrolet-k10-silverado-esi4746015
- 1983-chevrolet-k20-custom-esi5632961
- 1983-chevrolet-k20-silverado-esi4014313
- 1984-chevrolet-corvette-base-esi7203502
- 1984-chevrolet-k10-custom-esi4206361
- 1984-chevrolet-k10-scottsdale-esi2687083
- 1984-chevrolet-k20-custom-esi9918855
- 1984-chevrolet-k20-scottsdale-esi6984203
- 1985-chevrolet-corvette-base-esi3232212
- 1985-chevrolet-k10-custom-esi8295648
- 1985-chevrolet-k10-scottsdale-esi8115314
- 1985-chevrolet-k10-silverado-esi3904065
- 1985-chevrolet-k20-custom-esi4275603
- 1985-chevrolet-k20-scottsdale-esi3084059
- 1985-chevrolet-k20-silverado-esi3635725
- 1985-chevrolet-k5-blazer-custom-esi6357393
- 1985-chevrolet-k5-blazer-silverado-esi1991474
- 1986-chevrolet-corvette-base-esi9000412
- 1986-chevrolet-corvette-indianapolis-500-pace-car-esi1855962
- 1986-chevrolet-k10-custom-esi7978354
- 1986-chevrolet-k10-scottsdale-esi9023186
- 1986-chevrolet-k10-silverado-esi5796529
- 1986-chevrolet-k20-custom-esi4044588
- 1986-chevrolet-k20-scottsdale-esi3959439
- 1986-chevrolet-k20-silverado-esi8246224
- 1986-chevrolet-k5-blazer-custom-esi9131316
- 1986-chevrolet-k5-blazer-silverado-esi3639079
- 1987-chevrolet-blazer-custom-deluxe-esi6573341
- 1987-chevrolet-blazer-silverado-esi9838620
- 1987-chevrolet-corvette-base-esi2540351
- 1988-chevrolet-blazer-scottsdale-esi6509611
- 1988-chevrolet-blazer-silverado-esi5398551
- 1990-chevrolet-corvette-zr-1-esi6511928
- 1991-chevrolet-corvette-zr-1-esi8191954
- Bucket:Chevy
- Bucket:Ford
- Engine Components>Valve Seals
- EPA:N/A
- LTL:N
- MPN:503-8
- Non-CARB:N
- Prop65:Y
- SpecialOrder:Y
