HOME and how to join Forum Open Area General Scott topics Crank case Stuffing blocks. Re: Re: Crank case Stuffing blocks.

dave bushell

It’s a tuning mod to increase crankcase compression, but be careful, I had an engine that had been prepared by a well known sprinter and racer which performed well until one of the Allen screws either sheared or stripped it’s thread in the crankcase. The stuffing block moved, smashing the piston, the cylinder spigot and knocked a hole through the crankcase!