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Click on image for the lowdown. 
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Mod | | | Forums66 Topics128,049 Posts1,055,740 Members48,426 | | 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
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on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
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| | | Joined: Jan 2001 Posts: 5,337 'Bolter | | 'Bolter Joined: Jan 2001 Posts: 5,337 | An engine does not need to pass the vacuum test to be working properly.
Lets say for example that during the vacuum test that the vacuum is being drawn in through a gasket leak or past a seal.
Once the fresh air intake is unplugged after the test, the engine will most likely draw fresh air from that unrestricted intake easier than past a gasket or seal.
See the USA in your vintage Chevrolet! My Blog | | |
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