Hey Everyone.

I picked up a 5.3L Motor from a local. He said its a '03, however, there was a tag on it that said '04!

I need to determine the year for the wiring. Not sure if it means anything, but the ECM connectors are Green & Blue.

Here are the casting numbers i got off it (dont seem to match anything online)

Passenger side of block by oil pan
S04

Behind passenger head, on back of block:
12567392

Infront of Passenger Head:
06K02

Heads:
706

Thanks!

 

Casting Number 706
Head: 1999+ LR4 4.8 Litre Truck
1999+ LM4 /LM7 5.3 Litre Truck
Material: Aluminimum
Part Number:
12559852
12561706
Combustion Chamber Volume: 61.15cc
Compression Ratio: 9.5:1
Intake Port Volume: 200cc
Exhaust Port Volume: 70cc
Intake Valve Diameter: 1.89 inches
Exhaust Valve Diameter: 1.55 inches

 

Have you seen this cating number 1567392?
It is either a 4.8 or 5.3. It has a supercharger picked it up from a friend

 

That kinda looks like a part number...

 

man that sucks! I know the supercharger is from magnuson. it has a s/n number. carb number but no part number. Where on the engine block would be the casting number to find out what motor it is. on the back it has a 4.8l and 5.3l. The head has the 706 casting number on it

 

pull the heads a 5.3 has dish pistons a 4.8 has flat tops

and yea before some1 says it there are some flat top 5.3s out there but i doubt u got one of them