Question for some of you mechanics out there..

[rbull51]

I have a mystery rattle on my engine. Its been there since i have bought the car & which at the time only had 11000 miles on it. I did take it back to the garage where i had it from and they changed all the tappets. It wasnt them. So i took it back again and they fitted a brand new head and gasket. It did stop it for a while but after a 1000 miles or so it came back. I then decided to take it to my local garage and there i was told it is whats known as 'piston slap' which can be repaired but at the cost of around £1000! Has anyone else heard or got this problem?