I measured a couple of other barrels I have and it was around 13mm from piston skirt to exhaust gasket face ,on the Mugello its 24mm


This is causing a hell of a problem getting the exhaust to fit.
Has anybody come up with a way around this? I know Chiselspeed do a special short stub because of this problem with the V4 Mugellos, would one of their stubs fit a JL3?