Finally Got My Brat Running But Now It,s Making A Gurgling Noise On The Left (passenger Side )Of The Motor Like It's Getting Hot. So Took Out Thermostat And Wired Fan To come On When Engine Is Cranked, But Still After Running Just A Few Minutes And Shut Off Engine Still Gurgles.Timing Is set Right , Good Water Circulation At Radiator. Flushed Whole System.By The Way Runs Very Good No Smoke And Good Power.

Sounds like a possible air pocket. Not common, but possible. Jack the front up as high as you can while it's running, the rad cap off and have some 50/50 coolant mix at the ready. This should purge the air and you top it off as it does.