NOS 1973 GM 140 Engine Piston 3997405

Original GM New Old Stock (NOS) #3997405 engine piston and pin assembly. Genuine General Motors component, never installed and ideal for stock rebuilds, restoration projects, or collectors seeking authentic GM engine parts.

Applications:

• Chevrolet 140 C.I.D. Inline 6-Cylinder Engine
• Used on various Chevrolet models equipped with the 140 cubic inch six-cylinder engine
• GM service replacement piston
• Superseded by GM #460584 [oldsobsolete.com]

Part Information:

• GM Part Number: 3997405
• Description: Piston with Wrist Pin Assembly
• Condition: NOS (New Old Stock)
• Genuine GM Manufactured Part
• Standard Bore Application

Condition:

• New, never installed
• Original GM service part
• Excellent for restoration or period-correct engine rebuilding
• See photos for condition, markings, and packaging details