VCCA Home Forums TECHNICAL - 1945 AND NEWER 1955-1957 Need help decoding numbers/letter.

In addition to finding the cowl tag photo, I found photos of other numbers/letter (had forgotten I had taken them, brain cramp!)

If possible I would like to know what these numbers/letters mean.

1. On the top at the rear of motor right before the tranny = '3 GM' (the 3 is above and to the left of the GM;) '3731548'.

2. On the bolt mains clamp (?) holding the crank = '3743951', under that is 'GM 58'.

3. On the front of motor = 'G-17', under that is '548'.

4. On the intake = 'F67', below that is '3732680', below that is 'GM 3'.

5. Where the drive shaft is attached (u-joint) at the rear = '823' above the center and 'GM' below the center.

6. On the rear housing = '011', below that is '8726899' followed by a large 'GM 11' (only the GM is large).

7. On the very front on the top (maybe bottom) of motor is 'F67'. Right next to one of the bolt holes that bolts the engine to the stand.

8. On the top of cyn. head is 'F606F' (first 6 could be a lower case b). This is the number you lose with shaving I think.

Thanks in advance for any information you can give me about the numbers/letters...

Sorry about the long post but could not see making 8 separate topics.

I will re-ask in the "Mechanical - Engine, Trans, etc." category.

"548" is correct cast # for a 57 283.the rest of your questions aren't worded specifically enough to answer. give me a call some evening and i'll try to work thru the questions. mike

1-3731548 is the casting number for a 1957 8 cyl. engine

2-3743951 is the casting number for the front main bearing cap 1955-62 engine.

4-3732880 note 880-is the casting number for a 1957 2 barrel intake manifold.

6-3726899 is the differential carrier casting number for 1957-Note is 3726899

8-F606 is the engine ID numberFirst F indicates the engine was made in Flint,6 is the month (June)-o6 the 6th day-thelast F indiactes that its a 283 2 barrel Power Glide engine

Not sure what the short numbers indiacte like G-17 and GM 58...probably the foundry,vendor or date.

Thanks for that information on the numbers Gene; PS really liked your article in the new G&D, good job.

your question # 7 is the casting date of the engine. its the day it was cst at the flint foundry. it represents june 6th, 1957. look at it again, and note that the year is a single digit. had it been cast at tonowanda, ny, the year would have been double digits, in this case, F657.BTW, no corvette small blocks were cast in tonowanda, just flint mich, so a vette small block with double digits is almost certainly a restamped block if it carries a corvette suffix on its engine pad. mike

Good information to know, thanks Mike.