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I repeat what I said earlier, 200- 210 degrees in stop & go traffic is acceptable, as long as the temperature drops when cruising. If you want better results get rid of the flex-fan & do something about that restrictive shroud.

I wouldn't be too concerned about 200-205 degrees. With your rad cap & antifreeze in the motor you should be able to see 210-215 safely without blowing the cap. Back in the eighties I had a 13-1 340 & it ran all day at 180 to 210 degrees. Don't forget that antifreeze not only stops your motor...

I've read several threads on electric fans, but as far as I can tell no-one has asked the following question. What are the cfm ratings on the different factory fans at idling speed?