Plugs

[peter faxon]

What is the preferred spark plug for my 1974 Glacier with the 455 Olds
engine. The ones in it seem to have been originally gaped @ .080, and bent
down to about .060.
They are pretty old.

--
*Pete & Jeanne Faxon*
*Camarillo, CA*

 

[wayne rogewski]

The information is a bit dated, but I think most of them still apply. Im running the E3 plugs and have been happy.

http://www.gmcmhphotos.com/photos/data/5237/Spark_Plug_Application_Guide.pdf

--
77 Royale, Rear Dry Bath. 403, 3.55 Final Drive, Lenzi goodies, Patterson carb and dizzy.
Mid Michigan

 

[powwerjon]

Peter,
This is the current version of the “Spark Plug Application Guide” for the GMC coach. It is also available on the GMCMI parts interchange section and other locations.

http://www.gmcmhphotos.com/photos/data/7181/Spark_Plug_Application_Guide1.pdf

Just double click to open it on the photo site.

J.R. Wright
GMC Great Laker MHC
GMCGL Tech Editor
GMC Eastern States Charter Member
GMCMI
78 GMC Buskirk 30’ Stretch
75 GMC Avion (Under Reconstruction)
Michigan

>
> What is the preferred spark plug for my 1974 Glacier with the 455 Olds
> engine. The ones in it seem to have been originally gaped @ .080, and bent
> down to about .060.
> They are pretty old.
>
> --
> *Pete & Jeanne Faxon*
> *Camarillo, CA*

 

[Ken B]

Conventional Wisdom today says to gap to .040 and use platinum plugs.

> What is the preferred spark plug for my 1974 Glacier with the 455 Olds
> engine. The ones in it seem to have been originally gaped @ .080, and bent
> down to about .060.
> They are pretty old.
>
> --
> *Pete & Jeanne Faxon*
> *Camarillo, CA*
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--
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana