Coast/accelerate, and get a puff of blue smoke- - - -sloppy valve guides and/or bad intake valve stem seals. That same leak test adapter can be used to change valve seals while you hold the valves closed with air pressure- - - -just be sure not to release the pressure with the valve springs removed! Dropping a valve into a cylinder usually means removing the head. Another way to do a "head on" valve seal replacement is to pack the cylinder full of 1/4" nylon rope through the spark plug hole, push the piston tight against the packing, and change the seals.

www.ebay.com/itm/405882268688?

Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!