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Old 11-05-2019, 02:19 PM   #35
GOSFAST
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Join Date: May 2010
Location: Long Island, NY
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Default Re: Spark Plug Protrusion into Head?

Hi Anthony, one more time, the Offy head in the photo on the left has two .060" plug-washers installed on a .750" reach plug (shown lying on the head). Looks good to go?

The Edelbrock head in the photo on the right has no shims with the .750" reach plug, only the "thin" conventional plug gasket. But we did "chamfer" all the plug holes in these heads.

The "double" copper gaskets will pose no adverse effect in the overall picture! And it may just be your easiest way out right now??

No matter what method you choose you want the plugs as "flush" as possible to the chamber, no plug "overhang" and no overly exposed threads into the chambers. Plug threads hanging into the chambers is the worst of the two.

Thanks, Gary in N.Y.

P.S. This isn't a "new" issue for us here, it's something we've watched closely for as far back as I can recall. I firmly believe that many builders/rebuilders pay little to no attention to this issue. It is something that is extremely important, could mean the difference between "stripped" plug holes or not later!
Attached Images
File Type: jpg Flathead Offy Spark Plug Protrusion.jpg (70.0 KB, 118 views)
File Type: jpg Flathead Edelbrok Spark Plug Protrusion.jpg (81.5 KB, 109 views)

Last edited by GOSFAST; 11-05-2019 at 04:57 PM. Reason: C
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