I have not used any for that purpose but I don't see why not...and it's a handy thing. You don't need a fancy one , the cheapest rifle borescope would work,they have LED lights ,plug into a smartphone or tablet...just tape/ziptie securely to a flexible/adjustable magnetic pickup tool for easier "navigation".

I tried. its a NO Go. Someday I will learn how to weld aluminum. or if I take this one off I will measure out best I can where a port in the Valve Cover would go; then have an Aluminum bung welded in and install a brass or aluminum cap there. tada. Easy check port.

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"Know other lessons I need to learn? TELL me. Tired of learning'em the hard way".

Glow Plug Wait: [i} Time of silence in homage Rudolph Diesel. Longer you own a diesel. more honor you give". [/i]

Life; SNAFU Situation Normal All Fouled Up, & FUBAR: Fouled Up Beyond All Repair

-Now: Snafued Jeep TJ w/OM617 2Be daily driver & building SS M1079 w/Ambo boxed /live in Adv. Truck, Diesel KLR conversion
-Sold 62 UNIMOG Camper w/617 Turbo, 85 300SD