this has been killing me for almost a year now, especially because im a person who like everything to run nice and smooth on my V OK here it go's Both my RAD pipes go hard as soon once it reaches op temp im also having constant tiny bubbles when i take my rad cap off with is diffidently not normal! things that i have done to diagnose this problem: 1 changed HG twice with arp bolt once 2 head got skimmed 3 new thermostat 4 new Civic type RAD 5 proper cooling bleeding 6 lower pressure CAP 0.9 bar 7 comp test 170 170 170 160 now all some folks have told me is, if im not having no oil water mix, no overheating no overflow in tank,should i just forget about it??? BUT I CANT!! because this is a sign of my cooling system not running like it should im thinking this is a cracked head!! i have still not done the block tester leak thing because here in Aruba is hard to know someone who has that and also our stores don't sell them so my fav to ask is could someone go outside for a ride in there V or GT once you reach OP temp could you give you RAD pipes a squeeze and feel it both pipes are hard ??? really want to know if this is normal and pls give me all the info of what you guys think my problem is?? thanks a lot guy i will appreciate this