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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: May 2011 Posts: 187 'Bolter | | 'Bolter Joined: May 2011 Posts: 187 | What would have been the number for the original style spark plugs for a 1954 235 Chevy straight 6? Such as R45, R45S, etc......... Are they still available as an AC spark plug?
Thanks,
Tom | | | | | Joined: Dec 2010 Posts: 47 'Bolter | | 'Bolter Joined: Dec 2010 Posts: 47 | Original I believe was an AC44 but they’re no longer available so I run the AC45 which are a litter hotter plug in my 235 and it runs great.
1949 3100
| | | | | Joined: Feb 2004 Posts: 29,760 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,760 | The "R" prefix indicates "resistor", which was a newer type that the original AC 43, 44, and 45 plugs that did not have an integral resistor in the insulator. Those plugs are virtually collectors' items, and the R series aren't much more common. DO NOT USE a plug with a "TS" suffix- - - -that stands for "tapered seat" and it definitely does not interchange, even if the numbers are right. TS plugs usually have a 5/8" wrench size, rather than the 13/16" flats on a R44, R45, etc. NGK or Champion makes a suitable swap for a Delco plug if the AC isn't available. Just consult a heat range interchange chart.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Sep 2011 Posts: 1,453 'Bolter | | 'Bolter Joined: Sep 2011 Posts: 1,453 | If you happen to convert to HEI I found A/C Delco #7 platinum plugs work great!
BC
1960 Chevy C10 driver 261 T5 4.10 dana 44 power loc
1949 GMC 250 project in waiting
1960 C60 pasture art
Retired GM dealer tech. 1980 - 2022
| | | | | Joined: May 2011 Posts: 187 'Bolter | | 'Bolter Joined: May 2011 Posts: 187 | Thanks for the response, I will try to go with the AC45 probably unless they are just not available around MPLS.
Tom | | |
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