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Mod | | | Forums66 Topics128,076 Posts1,055,922 Members48,430 | | 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!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Jul 2008 Posts: 1,321 'Bolter | | 'Bolter Joined: Jul 2008 Posts: 1,321 | Stock plugs used in the early days were AC-44 with .035 gap The AC44 has been discontinued but occasionally shows up on eBay.
Delco plug numbers de-code as follows: R=resistor type, 4=14 mm thread, next digit (4 or 5)=heat range (higher number is a hotter plug), S=extended tip. The R45S plugs are middle of the road heat range & should work fine if your engine is in good condition. Heat range is simply how fast heat is carried away from the plug. I believe the AC R45S (gap .040) is the correct modern plug for our “unmodified” 216 motors.
Harold
Harold
Is a restoration ever finished? | | |
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