Poop, thats what i figured the minute i test fit the bolts....there just way too long, guess someone will be the happy owner of these ARPs back on sale in parts section $120. Thanks guys for all the help!

 

I just checked out my block, not sure if its a G or a 6 but its G or 6 0051. That was stamped on the driver side front of the block. On the passenger side its stamped 5.3L.
I'm not sure what year it is.

Is there a difference between the car and truck blocks? Could I tell from that?

Thanks

 

Nope! You Need the code from the top above the water pump. Yes there is a difference with car and truck blocks.

 

I just took a couple of quick pics of my block. Its a bare short block.
I dont see any codes other than the ones I saw. The only other mark I see is an A1 on the passenger side.
Any help would be appreciated
Thanks

 

Looks to be around 05 or newer because of the LS2 Style lifter trays and the 2nd generation cam plate with recesed screws. Is there a part or casting number on the back of the block by the bell housing???

 

in the valley were the knock sensors go is there any numbers cast into there???

 

05 or newer, sounds good so far, hah. Its in pretty good shape. Besides it sitting in my shed. I'm planning on cleaning soon.

Ran out and took these then my batteries died, hah.
The markings on the back are 12572733 and 5.3L E
I couldnt see any other castings.

 

The only Info I could find is that 12572733 Is an L33 aluminum RWD block. I believe that option didn't start till 2005

 

It looks to me like you've got a L33 5.3 liter there. I also see flat-top pistons, which reinforces that. For the L33, you need the newer style ARP head bolts, where the bigger bolts are all the same length.

I'm pretty sure that you are having difficulty because you haven't cleaned out the threads in the block. The ones I've had apart, had something similar to thread-locker in the bolt holes. To get the holes cleaned out, I took one of the old head bolts, and cross-cut the threads of it with my die grinder, to make it look like a tap. It cleans the threads up really easily.

What heads are you bolting onto that thing?

 

Well, thats good news. I was afraid I found a FWD 5.3. Not knowing what the difference is but was under the impression it was an L33. I'm happy Its in great condition.


AK,
You happen to have a part number for those head bolts?
I have a set of 317s that will be getting cleaned up, I'm going to polish them and see how they come out. Then I may port them.

Thanks guys, I appreciate it.