Quote:
Originally Posted by Recian
I learned mine the easy way. It has an emissions label on the radiator support that says 5.0L but yours is long gone. Your engine is identical to my 81. I'm still trying to figure out how my engine code is a T0311UDB which is supposedly an 83 305. But my truck is an 81 and the VIN is stamped next to the engine code. I'm thinking the code decipher on z28 is wrong.
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The "UDB" is the engine part number "broadcast code", and those can span across multiple model years.
By way of further explanation, the RPO LG9 denotes the 2 bbl 5.0L engine - but within that family there has to be different part numbers to support the various available option content;
For example (I'm making this up for discussion purposes):
Part Number, B/C Code, Description
12345678 = UDA = 5.0L, 2bbl, manual trans, no A/C, federal emission
12345679 = UDB = 5.0L, 2 bbl, auto trans, no A/C, federal emission
12345680 = UDC = 5.0L, 2 bbl, manual trans, A/C, federal emission
12345681 = UDD = 5.0L, 2 bbl, auto trans, A/C, federal emission
12345682 = UDE = 5.0L, 2 bbl, manual trans, no A/C, California emission
12345683 = UDF = 5.0L, 2bbl, auto trans, no A/C, California emission
12345684 = UDG = 5.0L, 2 bbl, manual trans, A/C, California emission
12345685 = UDH = 5.0L, 2 bbl, auto trans, A/C, California emission
There would be a similar roll out of part number/codes for all the L6 engines, all the 350 cu in engines, all the 454s and all the diesels.
As you can see it's easier for the assembly line operator to read the manifest and go after a "UDB" than to try to remember to get a 12345679.
These codes are re-used as long as possible until some significant product change makes it necessary to roll the part number and therefore the b/c code along with it.
K