Apologies if this topic has been done before but I’m a new member and currently own a TR4A which I’ve had just over 3 years. The engine has been running with excessive vibration and power seems to be deteriorating. On a recent compression test there was a substantial difference on the inner 2 cylinders of some 50%. I’m looking at rebuild costs and having been quoted 2 prices, one for a standard and one a stage 2 where the price difference wasn’t too bad ( around £900) between standard cam and new bottom end and liners / pistons compared to the upgrade with fully balanced crank and new piston