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On the Chevrolet web site it says forged steel
LT4 Tech Specs-
Part Number:
19332621 or 19332702
Camshaft Duration (@.050 in.):
189° intake / 223° exhaust
Engine Type:
Direct injection spark ignition Gen-V Small-Block V8
Displacement (cu. in.):
376 (6.2L)
Bore x Stroke (in.):
4.06 x 3.62 (103.25 x 92 mm)
Block (P/N 12619171):
Cast aluminum with 6-bolt nodular iron main bearing caps
Crankshaft:
Forged steel
Connecting Rods:
Forged powdered metal
Pistons (P/N 12674094 Right Hand and 12674093 Left Hand):
Forged aluminum with internal ribs; flat-top crown
Camshaft Type (P/N 12642245):
Hydraulic roller
Cylinder Heads (P/N 12646959):
A356-T6 rotocast aluminum
Valve Size (in.):
2.13 intake / 1.59 exhaust
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