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10051118
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Crankshaft Seal Adapter
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A leak-resistant one-piece rear main bearing seal was introduced on production small-block V8 and V6/90º Chevrolet engines in 1986. Crankshafts in these engines were also redesigned to accommodate the new one-piece seal design. This adapter kit allows you to install an early-style crankshaft designed for a two-piece seal in a block which is machined for a one-piece rear seal. This seal adapter can also be used when installing a heavy-duty crankshaft in a cast iron Bow Tie small-block or Bow Tie V6/90º block machined for a one-piece seal.
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Technical Notes: The crankshaft seal adapter kit includes a two-piece aluminum seal retainer and related hardware. It does not include a gasket and two-piece seal; use pre-1986 two-piece rear seal P/N 10121044, retainer gasket P/N 12555714, and dowel pin P/N 9441003. The large outside diameter of the seal adapter requires a 1986 or later oil pan and gasket set. See the Chevy Power manual for installation instructions. Hex bolt P/N 10051121 and washer are used to hold the two halves of the adapter together. Bolt P/N 10051123 is used to hold adapter to cylinder case.
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10185100
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Crankshaft Forging
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This crankshaft raw forging is the same as design used on manufacturer P/N 3941184 except it is forged from S38 micro alloy steel. Can be machined for a 3.46" to 3.50" stroke.
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12556307
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Crankshaft (Forged Steel)
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This forged steel crankshaft is used on all 2nd design ZZ4 350 engines after November 1998 and can be used to replace all cast or steel forged crankshafts on ZZ4 engines only.
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Technical Notes: This crankshaft is made of 1053 steel and balanced to connecting rod P/N 10108688 and piston P/N 10159436. This crankshaft cannot be used on earlier ZZ design engines because the pistons change engine balance.
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14088527
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Crankshaft
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Used in the 350 (300 and 330 hp) special performance service engine with an identification code of "SP". This is a one-piece rear main seal type crankshaft made from cast iron.
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14096036
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350ci Forged Steel Crankshaft (One-Piece Seal)
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This 1053 forged steel crankshaft is used in 350 H.O. ZZZ-ZZ1-ZZ2-ZZ3 small-block V8s. It has a 3.48" stroke and 2.10" diameter rod journals.
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Technical Notes: This crank uses a one-piece rear seal. It has a 3.00" flywheel flange bolt circle, and requires a counterweighted flywheel for proper engine balance. Used in 5.7-liter High Output engine assembly.
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24502460
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Raw Crankshaft Forging
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Like the raw forging described above, this unmachined crankshaft gives competition engine builders the ability to customize a small-block Chevy's stroke dimension to fit a particular class or combination. It has a large front section for machining to big-block balancer size or small-block size. It will accommodate finished strokes from 3.20" to 4.00". The 2.900" diameter main bearing journals can be ground to fit 400ci small-block main bearings. This crank is forged from vacuum degassed 4340 steel, which provides exceptional strength and durability. This is a "non-twist" forging; all rod throws are forged in place. The large, circular counterweights are engineered to minimize bearing loads. The rod pin arms are lightened, and the machining pads found in production cranks are eliminated.
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Technical Notes: This crankshaft has no machining performed. It has replaced 5140 steel crank forging P/N 366280. Use with early style two-piece rear seal.
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3941180
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350ci Forged Steel Crankshaft
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This forged 1053 steel crankshaft has a 3.48" stroke and 2.10" diameter rod journals. It is not nitride treated.
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Technical Notes: This crankshaft requires a pre-1986 two-piece rear main seal. The forging ID number is "1182."
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3941184
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350ci Forged Steel Crankshaft
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This 1053 steel crankshaft is nitride treated to increase its journal hardness. It has a 3.48" stroke and 2.10" diameter rod journals.
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Technical Notes: This crank uses a pre-1986 two-piece rear main seal. The forging ID number is "1182."
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