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Click on image for the lowdown. 
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| | | Forums66 Topics128,021 Posts1,055,351 Members48,420 | | 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: Feb 2000 Posts: 5,194 'Bolter | | 'Bolter Joined: Feb 2000 Posts: 5,194 | The pins are just 3/8" bolts turned down. Yes they unscrew, but there is coolant behind them! You need to use thread seal on the new bolts, atleast on one of my heads I did. I would all so use plenty of high heat sealer on the gasket, both sides and tighten the bolts alittle at a time working across the header flange. Joe | | |
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