531 head chamber sizes

[bmw2101]

I have a 531 head, ive had it ported and the bigger 44/38 valves fitted i got from kl racing. It has a Kl racing T5 cam, it is 300 degs. I dont know much about it.

Now when i have had the head skimmed i asked for 2mm to be removed, but i think they have just removed as much as they can with out taking the cam out. Now i think i want about 42mm2 of chamber volume, but i think its measuring now about 55.

Is that far too much, should i take it and get more removed, or is that about right? I am not sure what to do. the car runs on 99 octane has microsquirt ecu on it.

thanks

[Jens Gustavsson]

the head is 146mm stock

bay something to measure the cc like a buret. or a cheep syringe