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Oil Dipstick within the Plenum?

claycookiemonster

Well Known Member
I have an IO-375 M1S on order from Aero Sport Power. Can anyone out there with one tell me whether the dipstick/fill tube will be within a cooling plenum or outside? I'm interested in the plenum cooling concept, but not sure I want to make checking the oil more challenging. The photo seems to show the fill tube aft of the right aft cylinder.
 
It'll be outside of the plenum. The oil fill dipstick tube will be behind the cylinders, the plenum only covers the cylinders.
 
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