Crank case breather?

[Alan G]

1958 VH500 with older head and barrels.

I now have oil dripping off the valve lifter spindle. Also seem to have a cracked oil pipe which is making a but of a mess. But my question is.... Is it possible that my bike is building pressure in the rockers which is forcing oil through any available vent, causing it to weep oil? If there is a breather, where is it, and how easy is it to check it is not blocked.

Thanks.