I dont know about the 3 port but i ran the d52 last year and the r8 this year so far. These engine are great never had a flame out didnt have to mess with tune at all and will run with the top names. Ic all these big name motors always flaming out and have tuning problem and i have none and the engine are cheaper. Also thanks to Rex he knows his stuff and is great to deal with I dont think youll be dissapointed with this engine line.