Quote:
Originally Posted by Bored&Stroked
Another option might be NGK Surface Gap spark plugs - they make one in 3/4" reach that might be worth checking out. A lot of boat engines use them. What I don't know is how much energy it takes to fire them and if there are any issues with fowling. I bought a set of 7/16 surface gap plugs to try in my 42 Merc 284 cube flathead (just for shits and giggles) - they are NGK BU8H. Regular plugs work fine in this engine, just wanted to try these for the heck of it. (I am running a Vertex Mag).
Here is a link to Summit, with a .750 reach NGK plug (#2322) . . . maybe be something that works, won't know until yah try it!
http://www.summitracing.com/parts/ngk-2322
Also, here are spark plug index washers at Summit:
http://www.summitracing.com/parts/mor-71910/overview/
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Whoa hey now!!!! that plug may be the ticket as I am running an MSD. I like that better than "double gasketing" another plug.