Tim,
The bolt pattern on the head is #2 on the link. The forging number on the crank is 3701894. This is absolutely a low pressure engine, all the bearings are babbit and the oil line plumbing is for low pressure oiling. Before these trucks became vintage they were just another vehicle that broke down and needed repair. I'm sure that not all repairs were always done by the book. My Frankenstien engine verifies this.
