New motor blowing oil on headers

Crankcase pressure test.
Hook up a regulated pressure source adjusted to 4psi and pump it in through the dipstick. Plug the valve covers. Get a windex type bottle filled with water and enough dishsoap to blow bubbles.Turn on the air and a hunting we will go, a hunting we will go, hi,ho,the daireeoh, a hunting you must go.
No more than 4psi!

Sucking the balancer on with a bolt is so wrong. There is a real good chance to pull the threads out of the crank nose. You need the proper tool for this.Beg, borrow, steal or buy,one.

If you don't have a PCV, you really should install one. Make sure your breathers allow air into the crankcase as well as out.
Re-read post #4. TB nailed it !
And do not start the car until the balancer is known to be secure. That little key on the crank may not drive the cam long with performance valve springs.