Were Denso Spark Plugs OE in many F-bodies??
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Approaching the 40,000 miles mark in my T/A I decided to replace the original spark plugs. My mechanic gave me the 8 original plugs to show me the condition but I was most surprised to see Denso as the original plugs. Were these commonly used as the original equipment spark plugs?
I went with the AC Delco 41-110 plugs now. They were pricey ($8.80 each) but worth it to me.
I went with the AC Delco 41-110 plugs now. They were pricey ($8.80 each) but worth it to me.
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All of mine came with Denso, from '98-'02.
I used to change them early as well. Then I finally let an assembly line set go for the factory recommended 100k miles (on my '02), and they came out looking great - shockingly nice actually. Now I won't ever bother changing a factory set on a *stock* engine until 100k, as per GM recommendation.
I used to change them early as well. Then I finally let an assembly line set go for the factory recommended 100k miles (on my '02), and they came out looking great - shockingly nice actually. Now I won't ever bother changing a factory set on a *stock* engine until 100k, as per GM recommendation.
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Why would you go back though? My mechanic showed me a TSB that shows this AC/Delco should be used, and with a smaller gap. There were technical reasons why, but that went over my head (I'm no mechanic).
Look at this link too. RPM WS6 is the 3rd post down and that's exactly what my mechanic did for my T/A. It does run great.
https://ls1tech.com/forums/new-ls1-o...0-0-040-a.html
Last edited by NC01TA; 04-30-2014 at 02:59 PM. Reason: Added info