TIMING CHAINS & SPROCKETS
The timing chain is the vital link for engine timing between the crankshaft and camshaft. GM Performance Parts’ timing chains and sprockets deliver strength and accuracy for many miles of dependable service. A. 12371053
 Timing Chain Kit, 502 (Second Design Gen VI)
• Heavy-duty timing chain kit for all second-design 502 Gen VI roller-lifter engines with aluminum front timing cover
• Kit includes chain P/N 10114177, crankshaft sprocket P/N 12550039, camshaft sprocket P/N 12551401, camshaft retainer and bolts
• Also used in 572 B. 10114177
Timing Chain, 502 (Second Design Gen VI)
• Single-roller design for all second-design 502 Gen VI engines
• Use with crankshaft sprocket P/N 12550039 and camshaft sprocket P/N 12551401 12554553
Camshaft Dowel Pin (not shown)
 C. 9424877
Camshaft Bolt
• 5/16-18 x 0.75" bolt
3975949
Shim (not shown)
• Camshaft sprocket shim, 0.10" thic | 
