Runing Team Orion CRF 21 7 port v3 WS edition engine for half a season now in a HB D817 V2 with both byron fuel and runnertime fuel. This will be a short review about my experiance with this engine.
First of all I decided to run this engine because one of my fellow racers recommended it, I have run FX, Reds and Picco before and had them all running strong. Even if I were a happy camper with both Reds and Picco I wanted to try something new.
I bought two engines and paired them with orion 2149 pipes. I had them broken in with EBIS and run them half a tank on the box and two tanks on the track while I put a conservative race tune on them. I could run them more than 10 minutes right from the start even on a high speed track with lots of grip and full throttle. I had fellow racers test my setup and they achived the same milage. The engine has performed like this the whole time and I have run 17.5 litres and it still has good compression. I haven't even used my second engine yet except when I put a race tune on it.
The performance of the engine is good with a linear power delivery from bottom to top end. It has the rpm needed for the rely long straights and still good torq down low all the way up to clear any obstacle.
I haven't been underpowerd with this engine and I think this is a really easy engine to drive compared to the 5 port engines I ran before.