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Click on image for the lowdown. 
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| | | Forums66 Topics128,085 Posts1,056,091 Members48,434 | | 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 | NAPA online shows 3/8" for all plugs listed for your year. Did you get NAPA info from online or from a local store?
I have several excellent NAPA dealers who have people who can and will look into catalogs for old parts. Nonetheless, I check out parts in NAPA online before I call or visit a local NAPA store.
Maybe someone will post informaton about the longer plug being OK. I'd go with 3/8".
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