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It's hard to explain, I'll post a pic tomorrow.Basically looking into the cylinder spigot of cyl. 3 on the left towards the flywheel,you will see a wall.Part of this wall has nothing behind it,you can drill a hole or mill a window in it.This way the air coming from the speeding piston can escape between the wall and the back of the case.
If I were to build a drag engine without a fan I would have a large -12 fitting above each cylinder spigot to get rid of crank case pressure.Remmele has done this also for one of his 3.2 liter street t4 engines ( with Porsche fan)
Cheers
Mark
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