lart951

I have a head it's a stage II head from a reputable vendor which I would not disclose his name. Anyway I want your oppinion to what might have cause the damage, Stuck valves but no broken timing belt, head gasket has a burn throught, head cracked by the water goose neck port. See the evidence,

hosrom_951

Damn!

Jeremy Himsel

I've seen heads crack from overheating but never that bad. Overheating and the blown gasket are related but unless the head cracked enough to tweak/warp the head enough to damage the guide it doesn't explain the valve.

Is there mark on the piston where the valve could have floated a bit and hit the piston?

lart951

Could it be that the valve guides where installed the wrong way?

dime1622

Ran out of oil and/or coolant and literally melted the parts into position like that?

lart951

It had oil and coolant.

dime1622

Are you sure it had enough? The cam tower is the first to lose oil.

fast951

If the guides are not sized properly, when hot the valve will stick. The engine was not running in this condition, was it?

Van

It's likely that the valve shaft was a little bent from the last rebuild... Blowing the head gasket caused enough of a temp rise that due to expansion the friction caused it to stick it in the guide.

George D

I was running this car going towards San Diego. All of a sudden I had no power, looked at my guages and the temp was in the red. I immediately pulled over and noticed that the freeze plug was blown out of the head.

The car was running fine with good AF ratios. I was crusing at around 80-90mph steady state. The car was flat bedded to San Diego. We tried to turn it over, but it didn't sound good.

G

George D

This head had about 15K on it prior to this running 18psi boost on pump and 22 on race gas. The AF and such was always in check. This head was on a motor that had 400whp at 22psi on race gas.

G

TRP951

magic?? seriously though could be the guide like john suggested

Keithr726

Sad, looks like it was a nice car judging by you sig.

Cory9584

dont tell me your parting it

lart951

Parting...?? who would think of that