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#1
04-19-2019, 12:30 PM
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Spark Pug Recommendations
What brand of spark plugs do you recommend?
Also, I have a newly rebuilt WT engine with 48 heads and an HO (068) cam. I'm not sure what the differences are between ram air plugs and a non-ram air plugs, but it sounds like I should go with ram air plugs.
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69 GTO Judge, Liberty Blue/Parchment, RA3, 4-speed 69 GTO, Verdoro Green, Green, 400, 4-speed 69 Firebird 400, Starlight Black/Black, RA3, 4-speed, 611 RA Inlet |
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#2
04-19-2019, 04:24 PM
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Factory recommended AC R44S for all GTO 4 barrel engines. Don't think 44's are made anymore. Next colder plug would be AC R43s
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Ed 1968 GTO (Thanks Mom) 2006 Silverado 2007 Cadillac SRX 2015 Chevy Express  2024 Cadillac LYRIQ 
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#3
04-19-2019, 05:20 PM
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Colder plugs reduce ping sometimes.
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#4
04-19-2019, 06:20 PM
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Thank you for your help.
__________________
69 GTO Judge, Liberty Blue/Parchment, RA3, 4-speed 69 GTO, Verdoro Green, Green, 400, 4-speed 69 Firebird 400, Starlight Black/Black, RA3, 4-speed, 611 RA Inlet |
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#5
04-20-2019, 02:09 AM
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For daily driving i would use ACDelco R45S.
For strip use or highway speeds only i might consider R43S. |
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#6
04-20-2019, 02:50 PM
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I had a worn engine that would foul R43S plugs. No fouling with R45S. Did have some pinging with R45S when I got on it.
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