Thanks!
Len and Pat Novak
1978 GMC Kingsley
The Beast II with dash lights that work and labels you can see!
Fallbrook, CA new email: B52Rule
http://www.gmcmhphotos.com/photos/showgallery.php?cat=4375
www.bdub.net/novak/
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces] On Behalf Of John Wright
Sent: Sunday, November 20, 2016 2:36 PM
To: gmclist
Subject: Re: [GMCnet] spark plug gap
I put together a spark plug guide that is available here or it is also in the GMCMI parts interchange.
http://www.gmcmhphotos.com/photos/data/5237/Spark_Plug_Application_Guide.pdf
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
>
> This could be why I've had 2 ignition modules fail in the last 4
> years. My plugs are gapped at .060.
>
> Great info, thanks!
>
>>> Gents,
>>>
>>> 1978 GMC, 403, Delco R46SZ
>>>
>>> The air cleaner says .060, but I hear that may be too wide.
>>
>> Len,
>>
>> That is because in tests run in the early 70's it was discovered that wide gaps and hot sparks reduced misfire and therefore HC emissions.
>> But the fact became clear shortly after the release of the HEI that
>> 0.060 was too much for the hardware. OOPS
>>
>> Gap is really important to over all performance, but too wide can be tough on the systems unless they are built up from OE.
>>
>> Matt
>> --
>> Matt & Mary Colie - Members GMCMI, GMCGL, GMCES
>> '73 Glacier 23 - Still Loving OE Rear Drum Brake with Applied Control
>> Arms Now with both true Keyless and remote entry SE Michigan - Twixt
>> A2 and Detroit
>>
>> _______________________________________________
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>
>
>
> --
> Ray Erspamer
> 78 Royale - "The Great Lakes Eagle"
> Center Kitchen TZE368V101144
> Wauwatosa, Wisconsin 53226
> Email: 78GMCRoyale
> 414-484-9431
> Web Site:
http://ray-lisa.page.tl/
>
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