AC Delco R42CTS Spark Plugs (GM PN 5613808)
type: Unknown Type
Vendor: CorvairFarmer
Description:
AC Delco R42CTS Spark Plugs (GM PN 5613808) - sold each
Part Identification & Description
The AC Delco R42CTS spark plug (GM Part Number 5613808) is a copper-core, extended-tip non-resistor plug. Designed for high-output GM engines, it features:
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14 mm × 1.25 thread size
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13/16″ hex for standard socket fit
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Extended “CTS” tip for improved ignition and fouling resistance
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AC Delco branding with period-correct blue/white/red box
Specific Fitment Chart
| Make | Model | Engine | Years |
|---|---|---|---|
| Chevrolet | Corvette | 5.7 L V8 (L83, ZR-1) | 1984–1990 |
| GMC | K1500/K2500 | 5.7 L V8 (LE2, L05) | 1987–1990 |
| Pontiac | Firebird | 5.0 L, 5.7 L V8 | 1982–1987 |
| Pontiac | Trans Am (Turbo) | 3.8 L Turbo V6 (LN3) | 1989–1990 |
| Oldsmobile | Custom Cruiser | 5.0 L, 5.7 L V8 | 1987–1989 |
| Chevrolet | Caprice/Camaro | 5.0 L, 5.7 L V8 | 1982–1987 |
Cross-References
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NGK UR5
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Denso T14VP-U
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Bosch WR9FS
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Champion RS14L
- location - lux bin