What causes rod chucking and headgasket blowing?

[darrenjlobb]

All the damage is done while the engine is under load.....just weakens and bends them over time, until they finally let go / hit an oil squirter and lock the little end.....when they acually let go is rarely when they were pushed past there limits, normally a few days / weeks later when they have finally had enough of running in there newly found position....