KJShover
Proud Vmax lover
1300cc
Ported heads
Stage 3 Cams
High Compression Pistons
Morleys Jet Kit
Marks Exhaust
195 psig last compression test, so yes tolerances are on the tight side for the pistons.
I'm thinking thats going to be the nature of the beast for a while. High compression with some tight assembly tolerances are going to bring the heat.
Here are some places that make customs.
http://www.macsradiator.com/customradiators-1.aspx
http://www.wizardcooling.com/
http://www.coolcraft.com/