How do I find out what year model 6.0 I have.

 

It is a bare longblock. Has aluminum heads so it is at least a 01. I was told it was a later model than that but I want to know for sure.

 

The heads have #s on them. I don't know the vin #. Not sure on the dod as I have never seen one but I don't think so. It had 2 sensors in the valley cover but I think they are knock sensors. May yank the timing cover off and look at the cam and see if it is single or three bolt. Was hoping some #s on it would tell me.

 

Dished or flat top pistons would be another indicator...

 

I know it is a lq4 or 9. I just need to know what year it is.

 

There are numbers stamped on the block that will indicate the block's production date, I just don't remember how to decipher them. I remember reading about it in the internal engine section though, you could try searching there...

 

I will see if I can find it. thanks

 

I don’t blame you for wanting to know the year model of you block, as there is some important information that goes toward the basic build up needed in that information. Yes, all iron Gen III blocks are basically the same and all are a good candidate for a performance build up, but items such as cam bearings and head bolts are dependent on year model crossover’s and you will need to know what your starting with before purchasing these items.

GM changed the length of some of the head bolts in 2004. The '99-'03 engines had 16 long ones, (6.50” overall length) and four short ones, (4.40” overall length) along with 10 small 8.0 mm bolts. In '04, GM started using all short bolts (4.40”) to avoid the stripped threads that were caused when people put the short ones in the deep holes and tried to torque them down.

GM also changed the cam bearings in 2004, so that they require a different part number from the earlier models.

1997 thru 2003: 1st Housing Bore: 2.3260”, 5th Housing Bore: 2.3280”
Example = Durabond part # CH10

2004 thru current: 1st Housing Bore: 2.3460”, 5th Housing Bore: 2.3480”
Example = Durabond part # CH23

GM has always used a casting “clock” for parts they cast and I believe it is located on a flat area located in front of the passenger side cylinder head on the Gen III / IV motors, but don’t hold me to that.