Iv built a few of both in the gen3, i haven't found a heat issue with either, on street or track, but you need to be reserved with the head skim compression increases cylinder heat dramatically, if your using woosner pistons then a 0.45mm Cometic head gasket & 0.3mm head skim at most, if its JE pistons then 0.45mm Cometic head gasket with a maximum 0.4mm head skim. The fueling needs to be spot on so a good tuner is essential.