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Click on image for the lowdown. 
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Mod | | | Forums66 Topics128,030 Posts1,055,428 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!
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!
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#83887 10/11/2007 2:52 AM | Joined: Sep 2006 Posts: 2,393 Shop Shark | | Shop Shark Joined: Sep 2006 Posts: 2,393 | 1963-'66 Block 3921970 Forged 6 counter weights -7/16" bolt holes on flange Head 3864890
1967-'90 Cast 12 counter weights - 1/2" bolt holes on flange Head 3864980
Source: Leo Santuccii's Power Manual
Hope this helps.
Drew
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