[Jac Mac]

Two & bigger is better, plus take them from the valley side of the covers in between pairs of pushrods if possible. Think about it--- 5 liters/305 cu in @ 5000rpm with 5% leakage = 625 liters of blowby/venting reqd per minute---- thats three 200L / 55 us gal drums per minute. Yeh I know you wont run it that hard etc, but if you dont build it right in the first place you will wonder why it comes back into the pits covered in crap after your first track day.