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Any other reason (easy fix) other than a blown head gasket that would make the upper hose hard after about 15 minutes of running plus bubbling in the rad with the cap off? It looks like it's top end rebuild time.



If it's constantly bubbling, it's say it's a HG leak.

BTW, you've heard Revell is reissuing the Tom Daniel Tijuana Taxi kit, right? I noticed it in your avatar...