86 4runner. New block, new head, and still bubbles in overflow tank. Put the truck together last week. Drove it 6 hours from Arizona to Los Angeles at night. Really dont wanna take the head off again. New head bolts, used toyota head gasket. Someone please help!

 

I’d to a chemical block test just to get that out of the way.

 

Changed the rad cap no more pressure in hose or bubbles in overflow.