Engine Block Casting Number - 3970010
1972, 350 cid engine block with 2 or 4 bolt main caps. The casting number is mainly
for identification and
quality-control purposes. Through the casting
date, the day/night shift indicator and, on some components, the
"clock" position, it's possible for Chevrolet to pinpoint
within an hour or so when a specific component was cast. The casting
number also identifies specific "families" of components.
The casting number is located on the transmission mounting flange at
the rear of the block on the driver's side.
Engine Block ID
V = Flint Engine Plant
09 = 9th
day of month
DJ = 1972, 350cid, 175hp, 4 barrel
The ID number is stamped on the engine at the the engine
assembly plant and identifies the date of assembly, the
displacement/horsepower combination, and what chassis it was to be
installed in. The ID code is located on a pad just forward of
the passenger side cylinder head.
Engine Block Date Code - L41
December 4, 1971
The date code is located on the transmission mounting flange at
the rear of the block on the passenger's side and designates the
month, day, and year the engine block was cast. If the casting
date is later than the assembly date (Block ID Number), then you know
something is amiss -- it's real tough to assemble an engine before the
block is cast.
Cylinder Head Casting Number - 3973487X
1972, 350cid, LT-1 engine with 2.02" exhaust and 1.60"
intake valves, and 76CC combustion chambers. The cylinder head
casting number is found underneath the rocker cover, between rocker
Cylinder Head Date Codes - K261
November 26, 1971
December 8, 1971
Seems odd, but the two heads were cast in different months.
Guess they just grabbed whatever was on the self when they assembled
the engine. The date code is
found underneath the rocker cover, between rocker arm pedestals and
next to the casting number.
Manifold Casting Number - 6263751
Cast iron intake for 1972, 350cid/175hp engine with 4
Rochester Qjet carburetor. The intake manifold casting
number code is located on top of the intake.
Manifold Date Code - L61
L61 = December 6, 1971
The intake manifold date code code is located on top of the intake
next to the intake manifold casting number.
Exhaust Manifold Casting Number -
|The casting numbers on the Ram horn
manifolds are on the outside near the 1-3 or 6-8 cylinders.
So far, I haven't been able to find a decoder for these
numbers. I know the right hand manifold is not the
original because it has holes for emission tubes which are
capped off with pipe plugs. I'll keep looking for
information on the codes and post when I find something.
Carburetor ID Number - 7042210
= Rochester Prefix Code
= Decade (1970-1975)
= Year (1972)
= Quadrajet, 4 barrel,
= Division (Chevrolet)
= Transmission (Even
number is automatic)
The ID number is on the carburetor body on the drivers side behind the
secondary throttle lever.
Carburetor Date Code -
= December 6, 1971
The date code is found on the carburetor body on the drivers side
behind the secondary throttle lever, adjacent to the ID number.