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Re: [GMCnet] AC spark plug for our 78 403 [message #326306 is a reply to message #326295] Fri, 24 November 2017 11:30 Go to previous messageGo to previous message
BobDunahugh is currently offline  BobDunahugh   United States
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
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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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