hi mac
IN MY OPINION
firstly to go any larger with your cams you would need to upgrade computer to ems or other to even get the thing to idle otherwise the cam change would be pointless
SECONDLY AND MOST IMPORTANTLY
you NEED to run a thermostat not only so it opens at the right temp but slows the flow enough to actually cool when it passes through the radiator
I have a 4agte and have 221kw at the front wheels and have no heat problems
but did notice when i did not run a thermostat i had hunting for idle and to much heat at times
try a termostat first to try to solve this problem and you may find your head and gasket dramas may dissappear
i hope this helps
JOHN
p.s. WHAT WE WOULD LOVE IN AUSTRALIA IS THE PROBLEM OF THE HOTTEST DAY IN SUMMER OF 25 DEGREES WE ARE LUCKY TO GET THAT ON A COLD DAY IN WINTER.
ALSO WISHING OUR EMISSION LAWS WERE AS RELAXED AS YOURS.
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