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Mod | | | Forums66 Topics128,035 Posts1,055,446 Members48,422 | | Most Online14,466
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: Apr 2013 Posts: 82 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2013 Posts: 82 | What spark plug goes in a 1941 chevrolet 216. I bought it with AC delco M8. Running fine. having some water temp issues so going through all of the basics. Went to Advance and got autolite 3136. The autolite is shorter than the AC Delco. Which plug is right? | | | | | Joined: Jan 2000 Posts: 2,074 'Bolter | | 'Bolter Joined: Jan 2000 Posts: 2,074 | The AC Delco M8 is what it came from factory with. Don't think the brand of plug would be a cause for over heating. Good luck | | | | | Joined: Jun 2012 Posts: 1,747 'Bolter | | 'Bolter Joined: Jun 2012 Posts: 1,747 | According to the manual: AC-104. According to Champion: New number is UY6. Autolite: P4 or Motorcraft Autolight PR4. Bosch: U145T3.
Now isn't that helpful? All of these are supposed to be the same.
This list might be more helpful, at least it has more options:
AC Delco M8
Autolite 3136
Bosch M8AC0
Bosch stk 7548
Champion stk 842
Denso U20M-U
Denso L14-U
Denso stk 6003
Denso stk 5000
General Motors 1559459Motorcraft BT8
Napa X581NGK CM6NGK A6NGK stk 5812NGK stk 1010
Prestolite 09-10-06
Prestolite 18-10-01
Stitt 82
Now it is as clear as mud. I hope this helps more than it hurts.
My best guess, and it is only a guess: The autolight 3136 is the right length. But both are on the list. Maybe the length is not critical? Some one will know, I hope.
Steve H
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