Up until I stopped visiting the engine plants at Chrysler in the early 2001 time frame, we machined ALL the cam bearings after they were pressed in to the block.
Once you understand this is how it was done at the factory, the poor fit and finish of the cam tunnel becomes somewhat of an “ah ha” moment.
At least, it was for me.
Measuring the cam bore sizing got moved way up near the top of the list of things to check for determining the viability of the block as a buildable core.
I had gotten screwed by that a couple times.
Block is all done and ready to assemble, and a cam bearing slips right through the bore.
At the time that happened, the repair to the block cost more than a core 440 block was worth.
