Sounds like you started to stack a bearing on a cast rod. Shut her down just in time to save it.
I bought a 455 that had a severely stacked bearing on a cast rod, crank was just 30 seconds from snapping a rod.
Something you need to inform your machinist about. You need to bore it at least .008 under, not .004 under like you do with a Chevy.
The problem is Pontiacs distort .004 or more a 1/2" under the head bolts. You want your bores completely "round" after all.
If he can bore AND hone with a tq plate, great.
I asked for that on my 461 but he could not do it with his equipment. So he bored it .010 under and honed the rest with a tq plate.
Oh, I would run a Molnar rod all day long over a Eagle and they are about the same money.
I had to have a set of Eagles honed on the big end as they were tight when new.
Good luck with your new build. Getting it back by September would be fantastic.
A stacked rod bearing is why I tell all who want to listen, by forged rods. On just about any engine unless dead stock.
These things are too expensive to do otherwise.
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