G/day Baz,
I know it closes up in the cafe. My "hot" might be a bit warmer than most would get. 10.5:1, 105 octane, 2 x 30mm flat slides, straight through reverse cone meggas, 7500 rpm up Little Forest Hill. Barely made the last 1/4 mile, stalled at top. Let cool for 3 beers and she was good as gold. Did the same on way home (due to 3 beers) so I quickly took the covers off (ouch hot, ouch hot) and it took a good 1/8 turn to free the ex tappets and the inlet were zero clearance. When cold gave them an extra 2 and 4thou, not happened since. Most books will give bigger clearances for racing.
Cheers