Originally Posted by SERacer
Looks like the piston failed around the pin area. I cannot explain the flat marks on the side of the piston other than the piston ****ing in the bore and dragging on the side of the block. Then the chain reaction takes place, the rod pushes the piston up into the head, making contact with the open exhaust valve. The extreme contact punches a hole in the piston and sends a shock through the valve train snapping the cam.
The other possibility is the cam broke and hung the valve open.
How long was the cam installed before this happened?
Sorry.
Looks like the piston failed around the pin area. I cannot explain the flat marks on the side of the piston other than the piston ****ing in the bore and dragging on the side of the block. Then the chain reaction takes place, the rod pushes the piston up into the head, making contact with the open exhaust valve. The extreme contact punches a hole in the piston and sends a shock through the valve train snapping the cam.
The other possibility is the cam broke and hung the valve open.
How long was the cam installed before this happened?
Sorry.
They have been installed for 20.000 miles
You guys might be right abaout the cam actually being the beginning point.... hmmmmm