On the carb turbo intake manifold there is a little kinda like a popup valve that broke on my car 15 years ago. So I put in a bolt and just stopped it up. It is a pressure relief of some sorts though and I was thinking it performed the blowoff function for a carb turbo although they were not called blowoffs. Question is: Should I be plumbing a blowoff valve into this hole again and if so, are the blowoffs adjustable to differnt pressures? What pressure are blowoffs normally set to go off on?