I have read and heard the same thing. I don't think that is something I would wager much money on. Just from my experience riding The Triglide, a fan blowing across the cylinders Makes a huge difference. Adding the DK Tank left kit and the DK coolings wings contributes also Keeping the engine cooler. Also, Harleys cool flow fan works At keeping the engine cooler. Souped up engines tend to Run hotter (IMHO) than stock engines. Therefore requiring a few additional cooling methods to equal The stock engine Temperature set-up. If you have a thirst for more engine power than what the Triglide 114 puts out, than, Knock yourself out. You can get some amazing power out of these engines.
I think the left and right vent that some were referred to was not the vent doors ....But for the removal of one or the other plastic air scoops..(For lack of a better word)..On the left and right side under the bottom of the rear of the gas tank...??