| Re: [GMCnet] AC spark plug for our 78 403 [message #326307 is a reply to message #326306] |
Fri, 24 November 2017 12:20   |
powerjon
Messages: 2446
Registered: January 2004
Karma:
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Senior Member |
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Gentlemen,
There is a spark plug chart that has been published in the GMCMI parts interchange and available here:
http://www.gmcmhphotos.com/photos/data/5237/Spark_Plug_Application_Guide.pdf
Altho this was done in 2013 there has been no real updates in plugs available since then.
JR Wright
GMC Great Laker MHC
GMC Eastern States Charter Member
GMCGL Tech Editor
GMCMI
78 GMC Buskirk 30’ Stretch
1975 GMC Avion (Under Reconstruction)
Michigan
> On Nov 24, 2017, at 12:30 PM, Bob Dunahugh wrote:
>
> The 46 heat range seemed hot to me. But the plugs that I remove looked the perfect color as to heat. They have about 12,000 miles on them. I'll put new ones in anyway. And I want to index them trod the combustion chamber to alien the flame front. Not a big thing. Just me being anile with details.
>
>
> ________________________________
> From: Bob Dunahugh
> Sent: Thursday, November 23, 2017 6:55 PM
> To: gmclist@list.gmcnet.org
> Subject: AC spark plug for our 78 403
>
>
> When the PO put AC plugs in. R46SX plugs were installed. According to a shop manual that I have. The correct plug for the 403 is R46SZ. I'm not up on the meaning of the X, and Z. I'm sticking with the AC plugs. Bob Dunahugh
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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