Cylinder head Torx bolts

[guitarswet]

I'm a bit confused regarding the tightening procedure for the Torx (six sided) bolts on the cylinder head following head removal. The Haynes manual supplement implies you torque them twice and then 'turn the bolts through another 90 degrees' When I mentioned this to a friend he said it sounded as though they were 'stretch' bolts and as a result should only be used once. Do I really have to go and buy a new set of bolts? Does anyone have a foolproof procedure for refitting the cylinder head & gasket?

Thanks

Mark

[Noel Reeve]

I've not had the trauma of doing a head job myself, but if they really are stretch bolts, then the way I undertstand it is that you have to replace them.

[Robert Boyce]

I have just completed changing the head on my 2.0 Laser and
I'm affraid the torx bolt are indeed "stretch" bolts and therefore can only be used once.