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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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#67860 10/27/2006 3:02 PM | Joined: Sep 2003 Posts: 2,384 Shop Shark | | Shop Shark Joined: Sep 2003 Posts: 2,384 | I think air flaps ARE vacuum secondaries, usually the diff is double pumper vs. vacuum secondary. A vacuum secondary carb engages the secondary slowly(to prevent bogging) whereas the mech sec is instant(mech linkage) & uses a second accelerator pump to prevent bogging. The air flaps on a Qjet is just a diff way of doing things than the vacuum "pot" on a vac sec Holley. Usually vac secs are better on the street & double pumpers more suited for racing or hi-perf. Brian | | |
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