I would like to share this experience with you guys,
actually last July, one of my valve springs broke , i dunno how and my engine wudnt let my car run...
i replced it with the new valve and spring, but to my shock another valve and spring broke this time...
now i have replced my whole engine head weith new valve and springs, my mechanic says that this happens in 1 out of 100 cars.(P.S : unfortunately that 1 car was mine)
dunno how it happened, if any ideas do let me know.
rgds