RE: Glow Plug
For High Nitro(over 40%) Generally you want a Cold Pug glow plugs are categorized by Heat Rang not by number. Ask your LHS for a Medium Plug and a Cold Plug and see which works best for you. I prefer McCoy Plugs over the OD plugs, a McCoy MC9 works very well for Me running 60%nitro 12%oil.