Ive got the OPPOSITE problem it will get into the 200's in town/traffic/stop and go with not a ton of air flow but cools right down to 175-180(180 thermo) on the road. ive got a 6 pack scoop a Eddie 750 and its a 340 engine with stock cam and im guessing 8.5 compression. its a stock radiator with a typical 340 fan(no clutch fan just a "regular" one) and its got the shroud in place. Also not a sealed unit(obviously by picture)