Hrvey, it's slightly higer than the rest of the piston, the centre is only about 1-2mm higher, not alot!

Not sure 'exactly' were the gaskets had gone, they looked pretty worn out all round the water jacket, but 1 head was definately warped (had BOTH skimmed the same!)

Runs lovely now! Just gotta get the tracking done, Does anyone have the steering geometry specs in their locker?

Phil.