I'm worrying about whether to remove the lower cowl also, considering that the prop blast might do it damage without the support of the upper cowl.

 

Maybe I worry too much,  what have others done?

 

Bob,

 

No problem.  My lower cowl is only held to the fuselage by either 12 or 14 camlocs, naca to oil cooler connector tube, silicon baffle material at the bottom of the cooling air intakes and the induction intake to throttle body tube.  I have put safety wire thru a few camloc receptacles and then to the drilled head aluminum baffle hold down screws that go into the cylinder head.

 

Say so long to vibration!