Squarebody Adventures

One man's adventures of rebuilding a 1987 GMC R1500 Longbed

Engine Codes

After buying the truck and starting to dig into all the issues I found that the truck no longer had the original 305 engine installed. I was a little heart broken because I really wanted the 305 engine since my first C10 had a 305 engine. After much digging I learned that the engine is basically a cobbled together frankenstein engine. Meaning it’s got parts from multiple years.

Engine

Block code: T0107CKH

   
T Tonawanda
01 January
07 7th day
Code Year Size (cu in) Description Code HP Bolt Note
CKH 1973 350 m/t, 4 spd, NB2 L48 175 4 F=Camaro, A=Chevelle, X=Nova/Chevelle/Monte Carlo
CKH 1974 350 m/t, 3 & 4 spd, NB2 L48 160 4 F=Camaro, A=Chevelle, X=Nova

CKH was an optional engine for a Monte Carlo in 1977.

17D464862 = Partial VIN

   
1 Chevrolet
7 1977
D Doraville, GA
464862 Production sequence

010 on the side of the block next to the oil filler tube
Guess : Engine code 3970010 lines up with the engine stamp and heads

Heads

Stamp: 333882

Year(s) Code Description Intake Exhaust CCs Port Size
1974 - 1980 333882 350ci or 400ci 1.94 1.5 76 160/160cc

Prone to cracking, thin cast, low compression, and smog compliant heads