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Click on image for the lowdown. 
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| | | Forums66 Topics128,174 Posts1,057,047 Members48,458 | | 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: Dec 2006 Posts: 65 Wrench Fetcher | | Wrench Fetcher Joined: Dec 2006 Posts: 65 | The port on the metering block is ported vacume, the advance on the distributor connects to there. Any ports on the base plate are manifold vacume, the modulator and brake booster connect there.
Sean
doing what you love is happiness
loving what you do is freedom
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