117.968 220Kw 300hp 10:1 compression
You are allowed 0.08mm unevenness through the length of the mating surface, but none in the width. (So your heads are just about acceptable, assuming the block is perfect)
Dimension H cannot be less than 59.55
Total material machined from both head and block cannot be more than 0.5mm
Valve seats should be machined by the same amount as the material removed from the head.

Dont forget to helicoil the head bolt openings in the block using the proper jig, and use new head bolts.

Also, its worth changing all of the intake rubber, especially the large boot under the fuel distributor and the injection grommets. Vacuum leaks effect engine performance massively on LPG (ask me how I know!)

Hope this is of help!

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