What do you think caused this?

[rb68rr]

 

[rb68rr]

left to right #6 thru #1

 

[kidglok]

detonation? how was the oil pressure?

 

[rb68rr]

I believe the oil pressure might have dropped and I didn't notice until I heard the tale tale knock!

 

[krom]

What fuel?

 

[rb68rr]

I haven't checked the mains but I guess they will look the same!

 

[rb68rr]

The crankshaft actually looks good! Does this look like oil starvation?

 

[boostingbuick]

Looks like a lose of oil or green coolant. I don't see the spots from detonation.

 

[rb68rr]

Why does #6,3 and 2 look better than the others?

 

[blackdeathtrap]

my moneys on lack of lube

 

[turbofabricator]

In adaquate oil clearance, detonation, poor oil pump set-up, Poor assembly practices, not pre-lube prior to start up, no assembly lube, Gremlins, etc. What was your oil pressure on start up? What did you do to pre-lube the engine? What type/weight of oil on break-in? Did you make sure there weren't any of those pesky Gremlins hiding in your oil pan? New oil pump pick-up screen? Re-use oil cooler after a bearing failure? Prime the pump prior to start-up? What break-in proceedure? How many miles on build? What were bearing clearances at build?