I just finished putting together a 72 Camino, I swapped the small block to a Big Block 454 bought from a buddy that he got out of another friends Nova that did low 11's and apparently is tickling 600HP, I have a brand new 3 core aluminum rad, 195 stat, maradyne dual 12' fans with adjustable controller (2600cfm) that comes on very early, no bypass hose, but heater core is connected, nothing in front of the rad, I want to put in a trans cooler but haven't yet. I also swapped original dummy light dash to SS gauges with a brand new sending unit in the head. When I run the car the temps rise fairly quick to 215 on the gauge (within 5 min) and within a couple minutes the gauge is almost pegged at 250 but if I use an electric digital laser thermometer and test it externally right at the sending unit, it only shows maybe 200, but I have seen 220. Last night I took another factory style temp gauge, held it in the engine compartment and switched back and forth from that one to the one in the car and they matched pretty well, up to about 230 and then I just quit checking. it doesn't seem to overheat and blow out the coolant although before I put a new 16psi rad cap on, the old one that had 13psi stamped on it, did allow fluid to come out, I do not have an overflow, just a hose hanging, I think I need to do something about that, any suggestions? I have taken it for a drive and at 50-60 mph the temps do not come down at all, they just stay consistent at the 250 mark on the gauge. What do I need to do to cool this thing down? I was thinking of swapping the stat to a 180, possibly putting in the bypass hose, but other than that I'm at a loss.