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12556121 - Chevrolet Performance Parts 350 Partial Engine (Shortblock) Used With 12568758 (Goodwrench #12520270) (1987-1995 Truck Engine) & 1996-2000 Chevy & GMC Vortec 350 (Vin Code R)

This product may require vehicle validation(s) for proper fitment. Please contact us to confirm correct vehicle fitment and usage.

Availability: Item has been discontinued and is no longer available
Shipping: FREE 48 State Shipping


12556121 - New from GM Performance Parts, Partial engine assembly used with GM Goodwrench 12520270 Built from all new parts, assembly includes:

  • Cast iron 4 bolt main block with 1 piece rear main seal- factory roller compatible
  • Nodular iron crankshaft
  • Powdered metal connecting rods
  • Dished hypereutectic pistons (18cc dish)
  • Brass freeze plugs
  • Does Not Have A Mechanical Fuel Pump Provision
  • Cam bearings
  • Can be used in marine applications
  • Note: Oil Pump Is Not Included

When used with 76cc heads compression ratio will be 8.1:1

When used with 64cc heads compression ratio will be 9.1:1

When used with 62cc heads compression ratio will be 9.2:1

When used with 58cc heads compression ratio will be 9.6:1

Application List



  • 12556121
  • 12556121
  • GM (General Motors)
  • Item has been discontinued and is no longer available
  • New


Shipping Information

  • Item Requires Shipping
  • 253.0 lbs.
  • W19.0000” x H16.9000” x L28.3000”
  • FREE 48 State Shipping

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