Yes, as above. SSR's tuning tips are specific to the EFE engine. Doing a complete rebuild is costly and doing a rebuild with power increases is more costly still. For a rebuild and refresh you should allow £300-£500 to cover valve stem oil seals, a complete gasket set and other seals etc etc. I would open up the crank cases and look at the gearbox and crank too just to inspect them for wear. If the valve stem guides are worn new seals wont solve the problem so you need to check them for wear. Slotted cams dialed in precisely would unlock some hidden horses. If you want to increase performance you are looking at more like £1000-£1500. All of the above but add £500-600 for a 1230 kit and rebore heavy duty cam chain etc, £350-500 for a head port and new valve stem guides. You're over 2k if you want to to put a set of RS series carbs on and your up to 2.5-3K if you want to fit a performance exhaust to exploit all of the above. Obviously if you want lumpier cams etc the numbers keep going up. It's not a cheap business but it's worth it for my money. If budget is a key factor then set your budget and allow for 50% more than you think it will cost. That will determine what you can achieve. As far as the the GSXR head is concerned I think @Duckndive did this.