IROC Z28

iTrader: (1)

Stock L76 Engine from my G8 GT

Accelerated hard 0-80 and ka-boom at about 70 mph

Valve springs are good, Rod is connected tight. It is cylinder #5
looks like the piston fell apart and part of it was forced against the block making a hole on its way to the oil pan.... But why the failure?

S10xGN

iTrader: (11)

Pic #5 shows the oil looking like it's NEVER been changed! Was there any oil in the pan?

LLLosingit

iTrader: (4)

To many rpms would be my guess. How many rpms was it turning when it blew? How many miles on the engine. I agree with S10xGN that oil pan looks nasty, I've taken pans off motors with over 200,000 miles and they looked better.

IROC Z28

iTrader: (1)

Yes oil was always changed every 7000 miles or before with the 8.8 qt pan. 99% of miles are easy highway miles as i live in the country. I believe the oil looks nasty because of the large amount of coolant mixed in the pan and then sitting for a couple weeks mixed not to mention the gas getting squirted in as well.

I was turning about 5500 rpms when it let loose.