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Click on image for the lowdown. 
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| | | Forums66 Topics128,151 Posts1,057,009 Members48,460 | | 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: Jun 2010 Posts: 301 'Bolter | | 'Bolter Joined: Jun 2010 Posts: 301 | If you have the attachment to blow each cylinder up with compressed air it will point towards a head gasket or cracked head issue. It will leak air into the anti freeze and bubble up through the radiator. You will probably hear the bubbling too. I know I did!
1949 Chevy 3600
1975 W-25 Hurst Olds
1970 GMC 1/2 ton Fleetside
2010 Chevy Silverado
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