That looks like more than bearing material that came apart

There a swirling carbon tracking on top of one piston.

Look at this
http://www.sacskyranch.com/deton.htm

I know, I know, but I do not knwo WHAT it is, it almost looked like a metal "goo"........ but there was also bearing metal in the pan and oil galley and # 5 and 6 rods were lose.........

also the cooling passages were not well cleaned before assembly, I am not sure if this matters in this situation.....

motro never got hot, timming was checked several times, a merc tech was with me when it went, and it only made noise for MAYBE 15 seconds before we got it shut down. The oil was not burnt (it only had about an hour on it). Since I have had problems the tech and I both were hyper sensitive to possible problems.....

its doesn't sound like detonating to me,I am leaning towards something else maybe human error???

What oil galley??

Did you look at any other rods and main bearings??

It will be hard to tell now if there was a prob with clearance etc with those 2 now

Rob

Rereading your post I got ahead of myself.... What GM crate motor is it? The CR? a rebuilt engine?

Also the cylinder walls looks dark in one pick

Dean have you established whether these blocks have the correct bypass valve insatlled for marine use?

If they dont have the correct 30psi valve or have them plugged, most of your oil will bypass the filter and cooler through the block