K 3500 Truck 4WD V8-454 7.4L VIN J SFI (1996)
Piston: Technical Service Bulletins
Engine - Revised Mechanical Specifications
File In Section: 06 Engine/Propulsion System
Bulletin No.: 99-06-01-018
Date: October, 1999
SERVICE MANUAL UPDATE
Subject:
Revised Engine Mechanical Specification
Models:
1996 Chevrolet and GMC C/K Models
1998 Chevrolet and GMC F Model
1998-99 Chevrolet and GMC C/K/G/P12/P32/42/B/C Models
with 6.0L, 7.0L or 7.4L Engine (VINs P, M, J, B, D - RPOs LSO, LRO, L29,
L21, LP4)
This bulletin is being issued to revise the Mechanical Specifications in the Engine Mechanical Specification sub-section of the Engine Section in the
1996 C/K Service Manuals, and the 1998 and 1999 C/K/G/P12/P32/P42/B/C/F Service Manuals. Revise the text of the Engine Mechanical Specification
for the Piston Pin Fit in Rod Clearance Specification for the 1996 7.4 L (L29) to read as follows:
Fit in Rod - 0.0787-0.0533 mm (0.0031-0.0021 in) - Interference Revise the text of the Engine Mechanical Specification for the Piston Diameter
Specification for the 1998-1999 7.4 L (L29, L21) and 1999 7.4 L (LP4) to read as follows:
Piston Diameter - 107.891-107.904 mm (4.2477-4.2482 in)
Revise the text of the Engine Mechanical Specification for the Piston Diameter Specification for the 1998 6.0 L (LSO) to read as follows:
Piston Diameter - 99.936-99.984 mm (3.934-3.936 in)
Revise the text of the Engine Mechanical Specification for the Bore and Piston Diameter Specifications for the 1998 7.0 L (LRO) to read as follows:
Bore - 107.950 mm (4.250 in)
Piston Diameter - 107.873-107.922 mm (4.247-4.248 in)
