Engine - 4 Bolt Main Application
88chevy03Number: 88-133-6A
Section: 6A
Date: Jan., 1988
Subject: REPLACEMENT 7.4L ENGINES FROM GMSPO
Model and Year: 1988 AND PRIOR C/K, R/V, AND P
MODELS WITH THE 7.4L ENGINE
TO: ALL CHEVROLET DEALERS
The 1988 7.4L engine has incorporated some changes that include a new design piston and 4 bolt main bearing cap retention. For 1988 models or prior model years, on vehicles which are subject to heavy duty applications (such as motorhome chassis) it is recommended the 4 bolt design engine be used when a replacement engine is required. The 1988 7.4L partial engine assembly is completely interchangeable with the 7.4L engines for previous model years.
Parts Information:
P/N Description
14079367 Partial Engine Assembly - 2 bolt main design
10120942 Partial Engine Assembly - 4 bolt main design