Help, 440 blowing off valve covers!

[chry300sler]

Help, I have a 440 that has only 25,000 on rebuild. It over heated after loosing a freeze plug in one head. Now when you try to start it , it literaly blows the gaskets out from the valve covers with a bang and it blew the valley pan (puffed up like a pillow). The oil pan looks fine so the problem is only in the top end. I have never heard of this happening befor. Any help on where to start looking.

Chry300sler@aol.com

[DartGT66]

A leak down test, sounds like a hurt piston.

[pishta]

yeah, close the valves and put some air pressure into the sparkplug holes, I bet you got a holed piston. Sounds like you power stroke is getting out of the cylinder and into your crankcase.

[chry300sler]

To all, thank you for the advice. I suspected a burnt piston, but did not want to think it.

chry300sler

[cuda66273]

It'll take all the Kings Horses and all the Kings men to put that Old Mopar back together again...well that and a good VISA card...

She's broke Bubba