CRANKSHAFTS
GM Performance Parts crankshafts listed in this section are the backbone of a high-performance engine build and are the same components that go into GMPP crate engines. A. 3963523
Crankshaft, Forged Steel (454 & 502 Cubic Inches)
• Externally balanced
• Nitride-treated 1053 forged steel with 4.00" stroke, cross-drilled 2.75" diameter main bearing journals, and 2.20" diameter rod bearing journals Must be used with counterweighted torsional damper and flywheel or flexplate.
3963524
 Crankshaft, Forged Steel (454 & Mark IV 502 Cubic Inches) (not shown)
• Premium quality
• Externally balanced
• Nitride-treated 5140 forged steel with 4.00" stroke, cross-drilled 2.75" diameter main journals, and 2.20" diameter rod bearing journals Must be used with counterweighted torsional damper and flywheel or flexplate. 14096983
Crankshaft, Forged Steel (Gen V & Gen VI 454) (not shown)
• Externally balanced
• Forged 1053 steel crankshaft with one-piece rear main seal B. 10183723
Crankshaft, Forged Steel (Gen V & Gen VI 502)
• Externally balanced
• Cross-drilled
• Nitride-treated forged 1053 steel crankshaft with onepiece rear main seal
10114186
Crankshaft, Forged Steel (Gen V & Gen VI 427) (not shown)
• Steel 1053 crankshaft with 3.75" stroke for 1991-and-later 427 cubic inch engine
C. 88961554
Crankshaft, Forged Steel (572 Cubic Inches)
• Premium 4340 steel forging for 572 cubic inch engines Must use main bearing P/N 88962212 and rod bearing P/N 88962926. | 
