I run a 351w in my truck bone stock as far as I know. Well back in march of this year I was about to move but my friends wanted me to run one last bogg with them. So naturaly I did. We took five trucks in all. Well when we got there we unloaded and me and my wife decided to go out across the pond, we had no problem. A friend of mind needed to go back up to the entrance and asked if I'd take him. So we jumped in my truck and run the hard road back to the gate, but on the way back we just cut across the pond and that when the trouble started. I like to play in 2wd as far as I can, as we were coming across I noticed that I was losing power and I stoped and locked in and took off again. We were 2 feet from having my back tires out of the water and my motor just shut off. We pulled it up to the trailers and found out that I had three plug wires loose/off the passenger side of my motor. I thought that was the problem, I put them back on and didn't think much more about it. A little while later when I decided to go back out it wouldn't crank so we popped the clutch, I made about 3/4 away across the pond and it shut down again. I got out expecting my wires to be back off, but they weren't. The security for the bogg pulled me out with the house truck, and we popped the clutch again and I headed for the trailers again and before I could get there it went to losing power, when I got to the trailer I was pissed. 4 or 5 of us went to checking it out, I noticed it didn't have any water in it so as was filling it up steam rolled out of the driverside of the block and when we looked for why the steam come out we realized that th middle freeze plug was gone, We checked my temp gauge and found that it had quit working. I was highly pissed off by this time, but my father in-law was headed to town to get some parts for his so I had him pick me up an adjustable rubber frezze plug. We put it in, filled it with water, and obouvisly it woudn't crank so we popped the clutch. My headers are built to where all 8 of my pipes come up through the hood, when we got it crunk water was spraying out of the back 4 cylinders of the motor. Across the pond we went, I pulled a chevy out and came back across the pond. As we were getting back to the trailer the motor was trying to lock up again. We waited an hour until it was time to leave, we filled it with water popped the clutch, I pushed my buddies jacked up 62' tempest on his trailer and loaded mine. Got home and unloaded it and pulled it to my buddies house(it wouldn't crank when we tried to pop the clutch cause it was out of gas). As a going away present and for the $250 I gave him my buddy tore my motor down and put a new set of head gaskets on it. We didn't have the heads hot tanked or anything, looked at them didn't see any visible cracks so he put it back togehter. The motor still hasn't given me any problems. To have locked up like that, that many times. Thats one hell of a motor.