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Click on image for the lowdown. 
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| | | Forums66 Topics128,120 Posts1,056,325 Members48,439 | | 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: Sep 2001 Posts: 29,269 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,269 | My 1948 original 216 on a panel truck had the original-spec 10mm spark plugs. I last worked on that engine 45 years ago. I still have the spark plug wrench for it.
As I posted above, by all 1950 and newer 216/235 engines had 14mm spark plugs. | | |
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