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Hello !
How much can I shave head on standard TS engine ? My friend has TS with 0.7mm shaved head and all is OK and car drive better (RON98). How much is max. for standard engine.
Sorry for my bad English.
Thank you for help.

may be 1mm is max for standard head ... over 1mm and you will end in valve seats ! if you want to up CR just put NORD conrods, they are 1mm longer and dont forget to check valve/piston clearance

Valve seats are about 1,5mm deeper on stock head.
1mm is for valve seats still OK.