The plate that holds the jug is the torque plate also.
And I always check them after with a ring style one when I'm done chamfering ports, I never use a ballhone in them, but check for irregularities with 800 paper wrapped on a sunnen honing stone set that's wore off. 2 strokes and anything high is visable immidiately.
If a guy wanted to get carried away the jug should be at operating temp, but that'd price the work beyond most guys budget, I've never done it either, but our perf briggs stuff was always heated first to distort the aluminum bore to actual race conditions. (Only on the stuff we needed very tight) the other stuff we did was run them very loose, with large ring endgap for the alky motors at the jr dragster stuff, then you go over to the buddys with the topfuel car, get some fresh used oil and run it in the briggs, there's enough nitro in the oil to take a fair bit of time off
