What does cc'ing a head involve?
 

My car currently undergoing a topend rebuild. Then engine builder said that the heads 'cc'd at 89.8' - what does this mean exactly?

Also said my CR is 10.45:1 (euro spec + some machining of barrell to head face)

Any thoughts please?

http://forums.pelicanparts.com/911-engine-rebuilding-forum/348387-bouffant-hairdos-miranda-grace-slick-these-heads.html?highlight=washer+fluid

89.8 must be your combustion chamber volume.

I think 10,45:1 means you should have twin plugs if not already installed. Milling the head is not a good way to increase compression ratio.

thanks John!

Car is single plugged, but I'm guessing 10.45:1 is borderline on a RoW UK based car, even with 98/98 Ron fuel.