Page 171 of GM Performance Parts 2006 Catalog by GM Parts Direct

Crankshaft Forging B Crankshaft Seal Adapter C Crankshaft (forged steel) A 169 NOTE: NOTE: NOTE: NOTE: NOTE: 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. 14088526 Crankshaft, cast iron This is a nodular cast iron, one-piece rear main seal crankshaft for 300- and 330-horsepower engines. This crank does not have a pilot bearing. A. 14096036 Crankshaft, forged steel Forged 1053 steel with 3.48" stroke and 2.10" diameter rod journals and standard 350 mains for 350 HO engines with one-piece rear seal and 3.00" flywheel flange bolt circle. Used on ZZZ, ZZ2 and ZZ3 engines. Requires counterweighted flywheel. 12556307 Crankshaft, forged steel (used in late-style ZZ4 engine) Forged 1053 steel crankshaft used in post-November 1998 ZZ4 engines. Replaces all cast or steel ZZ4 crankshafts. Must be used with connecting rod P/N 10108688 and piston P/N 10159436. 12489436 Crankshaft, 383-cubic-inch forged steel Forged 4340 steel crankshaft used to create 383-cubic-inch engines with 3.800" stroke. Rod journals are 2.10" and mains are standard 350 size. Should be used with connecting rods P/N 12497870, standard pistons P/N 88962748 or 0.030" oversize pistons P/N 88962749, balancer P/N 12498008, and 1986-and-later one-piece crank seal design flywheel or flexplate. B. 10185100 Crankshaft Forging (350-cubic-inch style) Raw forging from S38 micro alloy steel. Can be machined for a 3.46" to 3.50" stroke. 24502460 Crankshaft Forging Exceptionally strong and durable 4340 steel raw forging ideal for machining to custom stroke dimensions from 3.20" to 4.00". The 2.900" diameter main bearing journals can be ground to fit 400-cubic-inch small-block main bearings. Large front section can be machined for big-block or small-block balancer. Uses early style two-piece rear seal. C. 10051118 Crankshaft Seal Adapter Allows installation of early-style, two-piece seal crankshaft in block machined for one-piece rear seal. Adapter allows installation of heavy-duty crankshaft in cast iron Bowtie small-block V-8 or 90 V-6. Kit includes two-piece aluminum seal retainer mounting bolts and hardware. Gasket and seal not included. Use rear seal P/N 10121044, retainer gasket P/N 12555714, dowel pin P/N 9441003, and 1986 or later oil pan and gasket set.

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