Conquest blowing oil out of dipstick wtf?

[hareboy1979]

So my brother finaly gets his conquest to stop burning oil by adding a aftermarket head after having the entire bottom end rebuilt now he has a problem with oil blowing out of his dipstick.
what could cause the added pressure in the crank case.

I myselfe suspect the guy who built the motor didnt put the right rings in or didnt install them right in the first place.

Lookin for someone to solitify my idea on this.