I'm not knocking the engine that you have or anything, don't really know anything about it.. but here's something to consider - the new cooling head will cost you 40 bucks or so.. that's almost half the price of a new OS engine (.12 or .18)..

the reason I say this, I bought the bling bling head for my evader to fit the DTX .18, I started having problems with the engine, and a couple of weeks later, I replaced it with an OS engine, now I have the spare head sitting here and nothing to do with it..