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Click on image for the lowdown. 
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9 members (68ironhead, Nhluvstruck, 55shaker, David Bush, MickeyP, TGP, Otto Skorzeny, treegrower, 1 invisible),
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Global Mod,
Mod | | | Forums66 Topics128,090 Posts1,056,016 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!
| | THANKS!
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: Feb 2020 Posts: 47 'Bolter | | 'Bolter Joined: Feb 2020 Posts: 47 | Depending on which book you use you will see different settings. I use .012 on the intake and .016 on the exhaust when hot. Cold start up can be set .002 looser and reset when hot. The 477-412 and 819 heads have the small ports. Some 270's use the 417 large port head (rare) and the 302's all use the large port 983 heads. Gaskets will not interchange.
Joe
just retired and finally making headway on my project truck. 1940 GMC AC152.
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