RE: New CMP 50-sized Corsair
I just measured my cowl and firewall and I have 130mm (5 1/8") Do you have your engine in yet? If not, then you're OK,,,,that's where my cowl is. To try to get it on any further would take a hammer. Also, when I reinforced my cowl, I didn't go all the way to the end with epoxy and glass cloth because I knew it fit tight as it was.
Little hint that may help you. If I were to do it over, I would move the cowl and engine out more. I needed to add a lot of weight and moving the engine out more would have helped. If you have your engine mounted to the mounts, no problem, add shims behind the mounts if needed.
Larry