#12 sure looks blue to me,it appears as if the oil could not exit the journal,so the oil boils between the journal and the bearing.am i seing it wrong,or is the journal turning blue?

not knowing the history of these engines,makes me need to ask some questions,were the rods rebuilt or replaced at the time of build,or was this a completly new build?

The double chamfer combined with the full grooved mains is likely what killed it.. Here's some pics of various Callies, Manley, and GM for reference.

The one jornal at themain is very slightly discolored, the picture makes it look worse, but you are right.

The rods were brand new. The only thing reused at the time of the build was the block, and the crank...that was modified.

The last 3 pics are of the new crank and how the oiling hole should look.

Who built them?

Pictures of lifters that came out.

more lifters and cams

More cams - you have to look close to see what it going on.

Just a couple more

Again 20 HOURS