[Spridgets] Spridget blowing oil when jacked up...???

[Dave G.]

I couldn't think of a better way to describe what happened....
When the beast is straight and level, engine runs OK with no smoke after 
the initial fire-up...
Yesterday, I had the back jacked up (only the back - wheels about 18" off 
the ground) to set the rear brakes..
While up on the jackstands, I fired up the engine and it blew blue (oil) 
smoke !!!
Back on the level, no smoke... !!

Anyone have a good explanation why this happens??

--
Dave G.   KK7SS
'65 MK III Sprite in Richland, WA
"Real stupidity beats artificial intelligence every time."
    Terry Pratchett, 'Hogfather'