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Bored&Stroked · 01-21-2016, 06:43 PM

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/

01-21-2016, 06:43 PM	#7
Bored&Stroked Senior Member Join Date: Jan 2011 Location: Central Ohio Posts: 5,062	Re: Spark plug shims 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/