Was wondering about that. It still has like six bolts holding it on. If it were a low hp, non race application I'd try running it without in a heartbeat.
The six bolt hold the pulleys on the balancer.
I guess ya gotta do what ya gotta do, but I think I'd blue Locktite that sucker on and do it to it. :D
The Locktite would seal any oil seep around the crank snout and you have to use a puller to get them off anyway.
Just be a little harder to get off next time if there is one.
