ChitownRC

What size are the 4 screws for the OS cv-r engine head? I am just wondering because I am taking out my stripped ones and I don't think they are 3mm.

just match it up to a 3mm and see if it's the same

I did. It looks a bit smaller. I guess I can try them with the head off and see if they screw into the engine.

the difference from a 3mm to a 4mm is big, you'd notice

I was comparing it to a 3mm tony's screw. The screw from the head seems smaller.

the screw head has nothing to do with the screw size. You have to match up the threads