anyone recomend descent leakdown tester?

ok, i also checked what is called a bolt extractor, it keeps you straight while drilling out the broken bolt/stud. I will get the intake valve seals changed as soon as i can and see what happens. I sure hope it works because i dont wanna spend the money on new heads ether, but i also dont wanna spend alot chasing down whatever it is. But at least i have limited it down to ether guides or seals, i just dont see it being an internal vaccum leak when i have 18 inches of vaccum a idle. unless it should be generating more vaccum, but i thought 18 was plenty of vaccum at idle.