Home <<

  Grand Am Emblems & Labels 


6.5 Litre trunk emblem

It is made out of die-cast metal. This is the stick- on variety GM started selling as a replacement in the 80's. The original had 3 mounting pins.

Engine code label

This is a reproduction of the engine code paper sticker that goes on the front of the driver's-side valve cover. It has the two letter engine code, ignition timing and and a bar code. It is not known what the bar code was for, but it possibly was used to set up the timing equipment to ensure the ignition timing was set correctly in production.

Since it was paper, it deteriorated rather quickly and few examples survive. Vehicles built before the March 15, 1973 emissions system change used black ink instead of red.

Battery label

This is the label that goes on top of the standard Delco R89 side-terminal battery. It is placed on top of the battery so that it can be read from the front of the car.

Since batteries only lasted about 3 years and were usually recycled, few examples survive.

Inspection stamp

This is an engine inspection stamp on the front side of the driver's-side front valve cover. It does not stand for Automatic Transmission. Perhaps Assembly Test 2?

Block ID Stamped Numbers

Motor Unit Number
The sequential production number for the engine. Often referred to in service bulletins to identify production changes or service issues. It appears all Pontiac engines were cast and machined in Pontiac, MI.

Engine Code
Two character code identifies the engine assembly. This is like an engine "model designation"  and can be cross-referenced to just about all the parts used on the engine. The same engine codes were used for vastly different engines, so one must know the year of the engine as well.

Partial VIN
Usually starting with 2P..... It identified the VIN of the particular car the engine was installed in.

Block ID Stamped Numbers (close up)

Motor Unit Number
Note that it is a 6 digit number.
Prior years had a leading "0" for a seven digit number.

Engine Code
 2 character application code

Block ID Casting Numbers by Distributor

74  Model year

E214 Casting date E = May, 21=21st day, 4=1974

2 Foundry casting line or Pontiac Division?

D<N Cast on Day shift

Note Allen head oil galley plug is not original. Pontiac used square drive plugs

Block ID Casting Numbers Passenger Side Rear

481988  Block casting number

Circle with dots Time cast = 8am?

2 Foundry casting line or Pontiac Division?

Block ID Casting Numbers Lifter Valley
Often these numbers are missing, especially on 4 bolt main and other performance blocks.

5 / 0 = 350 block

0 / 0 = 400 block

2 / 8 = 428 block

5 / 5 = 455 block

X / X = 78-79 blocks

Block ID Casting Numbers Driver's Side

400 = 400

455 = 455

Sometimes this number may be missing

Note the 5 motor mount holes

Block ID Casting Numbers Passenger's Side

400 = 400

455 = 455

Sometimes this number may be missing

Located behind dipstick tube

Sometimes this number may be missing

Head ID Stamped Numbers 

3H = 400 4bbl 4X head with screw-in studs and heavy valve springs for manual trans car.

1974 HEI distributor

Some articles say that HEI did not come out until 1975, but this is not true. HEI was released May 1st, 1974 which required new engine codes for the rest of the 1974 production year. Most, but not all engines got HEI. The SD-455 did not.

The distributor has the number stamped on the side of the housing and also on the aluminum tag shown. 112871 is for a WR code manual trans 400.

The date code 4E17 translates to:
May (A=1, B=2, C=3, D=4, E=5...)
17th day of the month

4 different types of distributors were offered in 1974
Uniset points (combined points and capacitor)
Unitized Ignition

Frame sticker

This is an example of the sticker that goes on the driver's side of the frame behind the rear wheel. Note that is is mounted upside down. This is the way it was originally mounted. Frames were shipped upside down.

It has a two letter code and the GM frame part number, 338031 for a 1974 2-door A-body frame.

Energy absorbers

The bumper energy absorbers had yellow and black warning labels.