6.2-6.5l cylinder heads & block

[lmocibob]

i have a set of heads off a 6.2 or 6.5l diesel
the casting number is 10137567 are these 6.2 or 6.5 heads ? also which injector nozzles will fit these heads. ?

the block casting number is 10149599 it has a 1 piece rear main seal, is this a 6.2 or 6.5l diesel. ?

[john8662]

From those casting numbers, the heads are 6.5 Heads, I've got a pair sitting on the shop floor that bear the same cast number. For the injectors, you can have your pick, just any of the fine thread injectors will screw into the heads (either 6.2 or 6.5). Most likely you'll use the injectors for the injection pump you will use with that engine.

For the block it could be either one, GM shared that block between 6.2 and 6.5. I'm not sure what the exact cylinder bore between the two would be to tell for sure. But if those heads came off that block, its probably a 6.5.

[Peter J. Bierman]

A bore of 101 MM is a 6.2 L.
A bore of 103MM makes it a 6.5L

Peter