So I've been trying to keep the temps down in my Camaro during the summer months for a few years now, and finally pulled the trigger on a new aluminum radiator. (Champion two row 1" core). The install went well, and had no issues. Now that summer is here, temp spikes became prominent. I didn't see them in the earlier months of the year, so thought nothing of it. Monitored the overflow tank, and it never moved. I took off the radiator cap, and alot of coolant was gone. Perhaps I didn't "burp" it properly when I installed it. I bought a "no-spill" funnel, parked on an incline, and did it again...thermostat open, etc. Satisfied, started to drive it again. High temps, and missing coolant later, I got nervous. I saw coolant boiling out of the intake manifold by the thermostat housing, and saw some liquid marks on the hood there as well. Snugged up the intake bolts, carb bolts, and "No-spill" funneled it again on an incline. Also checked the idle with carb cleaner around the base of intake and carb...no idle fluctuation. I'm thinking maybe I solved the issue. Start driving the Camaro again...and same thing. High temps, and missing coolant. So now I drain the oil out and check it. It is perfect...not a drop of anti-freeze in it. I strain it, and put it back into the engine, (only has 400 miles on it). No oil in the antifreeze at all. I back it down the driveway, and fire it up. A small puddle of antifreeze forms on the ground under the muffler. Start up the engine, and slight puffs of smoke come out of the exhaust. It goes away quickly like on a dewy morning., and the car runs great. Next, I pull the plugs to look for washout on the cylinders. Plugs all look the same with no sign of washout. (Due for new plugs anyhow). I have Pro-Comp heads on the car for quite a few years now. I was thinking the obvious head gasket, but then thought perhaps a porosity issue within the head itself, as there have been known issue in the past with these heads...non of which I have experienced yet. Maybe a pinhole in the head that leads to the exhaust manifold side? I have been following another thread on Nasty-Z for a while, and was thinking of trying the AC Delco tabs in the radiator as an alternative to pulling the heads off, head gasket, and reworking the heads. (Trying to be cost effective...wife and two kids at home). Looking for opinions on this based on those that have tried them, or other products of this type. I figure if it doesn't work, I'll be tearing it all apart and flushing out the coolant system anyhow.