So each oil pump is different so not a proper measure of decking.
I would go off Mazworx. 0.03" = roughly 0.8mm. Check the FSM for limit to decking.
I guess you are running the 1.8mm to make up the difference.
According to FSM
Quote:
Resurfacing limit:
The limit for cylinder head resurfacing is determined by the
amount of cylinder block resurfacing.
Amount of cylinder head resurfacing is “A”.
Amount of cylinder block resurfacing is “B”.
The maximum limit is as follows:
A + B = 0.2 mm (0.008 in)
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Or you could just use the bad boy Mazworx head?? Any reason why you are not running it??