my lt1 one has a constant problem of overheating. tried all kinds of different, so called tricks, to get it cooler but in the summer its just to hot. heard drilling holes in thermostat would allow the water to flow better to keep engine cooler.... didnt work as planned..... also grounded one of the fans so it turns on as soon as the key is in the on position... that does help a lot... but i wish i could keep it cool without all the "tricks". eliminated the system that hooks up to my exhaust manifold and reuses the exhaust back in the heads to heat the car up sooner in the morning.... but still just today.. it gets a lil hot outside and my car stays above 220, reaches 250 then thermostat opens and goes back down to 220.. is that normal?