Stupid cam plug question

I bought a box of those Dorman cam plugs last year, and every one of them was cracked due to the forming process. Long story short the engine leaked out the back. Try holding that plug up to the light and carefully look for light peaking through, then fill the back of it up with some solevent and see if it leaks. Bought a box of old stock Pioneer cam plugs off Ebay problem solved.

To answer your question they go in with the logo facing back.