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Old 08-24-2016, 02:18 AM
bird 60 bird 60 is offline
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Question SPARK PLUGS for 1979, Olds 350

Hi Guys, I'm assuming someone else has a 1979 Cadillac Eldorado with the 350ci Oldsmobile Engine. The recommended Spark Plugs in my Manual are AC R-47 SX. What is the equivalent NGK plug? I've had the Eldo for 2 years now & I thought I'd change plugs. The ones in the car are NGK B6E S., but I don't know if they are the right ones.
If someone can help it would be gratefully appreciated.

Thank You.

Chris.......From OZ.
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Old 08-24-2016, 09:05 AM
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jopizz jopizz is offline
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The AC Delco catalog shows a R46SZ, not an R47SX. I can't even find that plug listed. The NGK equivalent would be a 4536.

John Pizzi - Squarebirds Administrator
1959 Convertible

Thunderbird Registry #36223 856-779-9695
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Old 08-25-2016, 04:15 AM
bird 60 bird 60 is offline
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Thumbs up

Thanks John. My Cadillac Manual definitely states AC R-47 SX.
Looks like the AC R-46 SZ has superseded the original from back in '79. No wonder I couldn't cross reference. Everything is A OK
now. I still can't get over the 60 thou gap.

Thank you.
Chris....From OZ.
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