Engine# what do they. Mean

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Casting # is most likely 3970010.

V0405TJY

V= Flint plant
05= 5th month of the year
04= 4th day of the month


TJY 1973 350 conv.cab 155hp 4bbl C-10 to 2500
TJY 1974 350 conv.cab 160hp 4bbl C-10 to 2500
TJY 1978 350 conv.cab 165hp 4bbl C-10 & 1500
.
 
The 010, last three digits in most cases, indicate the engine block is a 4 bolt main

Nope....it only means it is a 4 inch bore SBC......302, 327 or 350.....in this case the TJY means its a 350 out of a pick up. Being from a truck its a good chance its a 4 bolt, but not always. You would have to pull the pan to make sure
 
Right on the money...

Nope....it only means it is a 4 inch bore SBC......302, 327 or 350.....in this case the TJY means its a 350 out of a pick up. Being from a truck its a good chance its a 4 bolt, but not always. You would have to pull the pan to make sure

I agree....
 

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