[andyb]

I still dont understand why? What are your gains versus the costs of all that work, if you dont want/ need horses?

I have 57mm pc111 and just had my cams and valve clearances optimised at jhp. The engine undoubtedly runs smoother, and has probably gained a bit more power. This versus the cost is IMHO worth it, and a justifiable bit to do.

Where do you want to stop? To balance the crank you will need a complete strip down...
I understand just the 2 gaskets that go under the cylinders are around £100.................