327 small block snowmobile
I really like that hot rod you have built. I could see myself on that thing about 40yrs ago! Bad to the bone, cold bones in your case! Just one sugestion, if you turn many rpm's I'd like to see you put a harmonic balancer shield or sfi damper on it. Extreme cold weather may make it more brittle, I don't know. It may never let go, but if it does you are too close to it with nothing in between. JMO. Keep on racing and having fun.