C506 S390N S391 Timing Chain Kits For Chevrolet
The DUHUI Bearing C506 timing chain kit is an OE-replacement component for General Motors vehicles equipped with 5.0L small block V8 engines (305 cu in). This timing chain kit includes the timing chain (C506), cam sprocket (S390N), and crank sprocket (S391), ensuring proper camshaft-to-crankshaft synchronization for optimal engine performance. Manufactured to match original equipment specifications, this kit delivers reliable performance for compatible GM vehicles.
Technical Specifications
| Specification | Value / Detail |
|---|---|
| DH Code | |
| Part Number | C506 |
| Kit Type | Timing Chain Kit |
| Timing Chain | C506 (26 links / 4 pieces) |
| Cam Sprocket | S390N |
| Crank Sprocket | S391 |
| Engine Displacement | 5.0L (305 cu in) / 5.0L (307 cu in) |
| Valve Configuration | OHV 16v |
Important: All information on this page is for reference only. Please verify OE numbers, dimensions, and vehicle fitment against your original part before ordering. Contact us for fitment confirmation.
DH Code & OE Numbers & Reference Numbers
DH Code:
OE Numbers:
12577183, 12577655
Reference Numbers (Interchange):
Cloyes: C506, S390N, S391
Vehicle Fitment
CHEVROLET: Camaro 1985-1988 (5.0L), Caprice 1985-1988 (5.0L), Monte Carlo 1985-1988 (5.0L), Impala 1985-1988 (5.0L), C10 Pickup 1985-1988 (5.0L), C20 Pickup 1985-1988 (5.0L), G20 Van 1985-1988 (5.0L), Nova 1968-1973 (5.0L/307)
PONTIAC: Firebird 1985-1988 (5.0L), Grand Prix 1985-1988 (5.0L), Parisienne 1985-1988 (5.0L)
OLDSMOBILE: Cutlass 1985-1988 (5.0L), Delta 88 1985-1988 (5.0L)
BUICK: Regal 1985-1988 (5.0L), LeSabre 1985-1988 (5.0L)
Engine: 5.0L V8 (VIN G, H, Q, S, U) – 305 cu in, 5.0L V8 (307 cu in)
Please verify OE number, dimensions and vehicle configuration before ordering.
Product Features
- Complete timing chain kit includes chain, cam sprocket, and crank sprocket for a full replacement.
- Pre-stressed chain design reduces stretch and increases chain life.
- Heat-treated gear sprocket teeth reduce wear and increase corrosion resistance.
- Designed specifically for GM 305 and 307 small block V8 engines.
- OE-grade materials and manufacturing standards ensure durability and long service life.
Installation Notes
- Verify timing marks on both sprockets are properly aligned before installation.
- Inspect timing chain guides and tensioner for wear – replace if necessary.
- Check crankshaft and camshaft keyways for damage before installing new sprockets.
- Torque cam sprocket bolt and crank sprocket bolt to manufacturer specifications.
- After installation, rotate engine manually to verify proper timing alignment.
About DUHUI Bearing
Manufactured by DUHUI Bearing – an automotive bearing supplier established in Zhejiang, China, in 2003. DUHUI produces timing chain kits and automotive components to OE specifications. Contact us
