[Racer x]

I mean jet size. I have spent hundreds of hours on the dyno with this engine. If you aren't pulling enough fuel through the carbs you don't make the power. You should have an A/F ratio about 13 maybe 12.5 to 1 . With 108 to 111 jets that is just about 30 hp. When I got 34 hp on my most powerful motor. 13.5 to 1 shaved block. Race gas and the ignition timing hitting 44 deg I was using 117 jets with stock carbs. I now use 129 jets in my cr special carbs and am about at 33 hp and the AF is some place around 13.
We will see but I would start at the 108 and watch it close. That's all.