Thin head casting?

[fozyybear]

I looked at a Cummins engine today in a piece of heavy equipment. It was a "B" series engine. It had a hole in the head at the #6 cylinder location right where the manifold bolts to the head. The hole was in the head and not in the manifold. It seems that Cummins had an issue in those early years with some thin wall castings right in this area. Can anyone confirm that?

Thanks
Eric

 

[DVolk]

Some did have cracked heads

 

[Simplysmn]

My understanding is the early Non Inner cooled truck's had problem's with the head's cracking by the injector's ?

 

[DVolk]

Thats true and then there was tells of some cheap asain made repop heads that have issues