LLY to LBZ

messejme

Jazzy, Me and Max
Mar 7, 2008
741
0
16
Branchburg NJ
Just curious. My LLY through a Carrillo rod through the block and I need to replace the block. Can I use an LBZ block with LLY heads, injectors, CP3 ,glow plugs, etc.?
 

56taskforce

Well-known member
Mar 30, 2014
1,074
51
48
This may help. I am pretty sure any block up to 2016 LML are interchangeable.
 
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$chultz38

Member
Jan 22, 2009
230
5
18
Depending on who you ask most think the lb7/lly crank is better. IMO they all break and one isn't any better than another. Now the LBZ rods, yes better than the LLYs.
 

S Phinney

Active member
Aug 15, 2008
4,011
18
28
Quncy, Fl
This may help. I am pretty sure any block up to 2016 LML are interchangeable.

They are interchangeable going backwards but not using a older block in a LML truck.


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56taskforce

Well-known member
Mar 30, 2014
1,074
51
48
That seems like an easy modification to overcome but like I said not sure why one would want to. Besides the EPA I'm sure would frown on older power train in a newer vehicle.
 

gmac32

Member
Dec 8, 2009
288
3
18
bellville ohio
This is true. I put my lly built motor in my lml. The passenger side motor mount didn't bolt up. I have a 3/8 plate bolted to the block to move my motor mount foward
 

56taskforce

Well-known member
Mar 30, 2014
1,074
51
48
If you get a new set of GM replacement mount they are drilled with both patterns. Just noticed the relatively new mounts on my LBZ have the five holes.