What are correct AC Delco replacement spark plugs for a 1972 350 L48?
1972 350 spark plugs
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Re: 1972 350 spark plugs
Based on the AC Delco website as well as previous recommendations and trials I use the 45TS in my 1972s.Vice-Chairman (West), Michigan Chapter NCRS
71 "deer modified" coupe
72 5-Star Bowtie / Duntov coupe. https://www.flickr.com/photos/124695...57649252735124
2008 coupe
Available stickers: Engine suffix code, exhaust tips & mufflers, shocks, AIR diverter valve broadcast code.- Top
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Re: 1972 350 spark plugs
Patrick-----
The R-45TS can be used and might even be better for most driving conditions. However, it's not the plug originally specified.In Appreciation of John Hinckley- Top
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Re: 1972 350 spark plugs
Same motor, so interesting change.Vice-Chairman (West), Michigan Chapter NCRS
71 "deer modified" coupe
72 5-Star Bowtie / Duntov coupe. https://www.flickr.com/photos/124695...57649252735124
2008 coupe
Available stickers: Engine suffix code, exhaust tips & mufflers, shocks, AIR diverter valve broadcast code.- Top
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Re: 1972 350 spark plugs
.035 gap. The 45 is a little hotter plug. If you run it AND run regular gas you are more apt to get pinging.Kurt Geis
Chairman, Midway USA Chapter
Targa Blue 1972, Top Flight and Duntov Award, 2014
Arctic White 1994, Top Flight, Hrt. of Amer. Reg. 2011
Arctic White 2013 60th Anniv Special Edition Conv.- Top
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Re: 1972 350 spark plugs
Who runs regular gas in a Corvette?Vice-Chairman (West), Michigan Chapter NCRS
71 "deer modified" coupe
72 5-Star Bowtie / Duntov coupe. https://www.flickr.com/photos/124695...57649252735124
2008 coupe
Available stickers: Engine suffix code, exhaust tips & mufflers, shocks, AIR diverter valve broadcast code.- Top
Comment
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Re: 1972 350 spark plugs
1971 L-48 specified the same R-44T as 1972. For 1971, though, the LT-1 called for the R-43T whereas 1972 LT-1 called for the same R-44T as L-48.
Addendum-----
I've found some conflicting information for 1971 L-48. GM information says that the R-44T was specified. Delco information says the R-44TS.Last edited by Joe L.; May 4, 2013, 10:38 PM.In Appreciation of John Hinckley- Top
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Re: 1972 350 spark plugs
Originally posted by Michael Ward (29001)People with stock smog engines that know that anything higher than 87 octane is a waste of money. That's what the cars were built to run on.Vice-Chairman (West), Michigan Chapter NCRS
71 "deer modified" coupe
72 5-Star Bowtie / Duntov coupe. https://www.flickr.com/photos/124695...57649252735124
2008 coupe
Available stickers: Engine suffix code, exhaust tips & mufflers, shocks, AIR diverter valve broadcast code.- Top
Comment
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Re: 1972 350 spark plugs
Sorry Mike, you're not going to goad me into one of your arguments.
Have a good day.Vice-Chairman (West), Michigan Chapter NCRS
71 "deer modified" coupe
72 5-Star Bowtie / Duntov coupe. https://www.flickr.com/photos/124695...57649252735124
2008 coupe
Available stickers: Engine suffix code, exhaust tips & mufflers, shocks, AIR diverter valve broadcast code.- Top
Comment
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