NOS ac Delco plugs

NOS118

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Who could share what is the factory spark plugs for 75 455…are they the green ac Delco plugs ? And what is the best temperature plug for this engine.
 

92 Sunbird LE

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I don't have that model of car( internet info), I run Autolite single Platinums in both of my vehicles, with one set has about 14 years on them in my Chevy truck, and the Sunbird has 10 years on them.I run them because they don't foul with the little oil they both burn...I haven't used AC plugs since the mid 90's..

Doug in P.R.😎
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NOS118

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Just wanted to share with every one that I changed out r45tsx to r46tsx. On my 1975 455 Gapped to 0.60 and noticed a greater improvement in idle and smoother acceleration. I did read a few technical articles that going 1-2 steps up in spark plug temperature grade is better for classic engines running modern fuel’s since they have greater o2 properties.
 
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