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Re: [GMCnet] AC spark plug for our 78 403 [message #326296 is a reply to message #326295] Thu, 23 November 2017 19:34 Go to previous messageGo to previous message
emerystora is currently offline  emerystora   United States
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Registered: January 2004
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According to plug information I have the R46SZ replaced the R46SX. The SX's were gapped for .080 and the SZ was gapped at .060. Only difference. Just bend your tab on an SX and make it work. However the current thinking is that a .038 gas is better with the hei system.

Emery Stora

> On Nov 23, 2017, at 5:55 PM, Bob Dunahugh wrote:
>
> 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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