Author Topic: Which Vacuum secondary spring are you running on 4053-DZ 780  (Read 403 times)

WaltZ

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Which Holley Vacuum secondary spring are you running for the 1969 z28 Holley 780 4053 with the standard duntov speced cam.
Looking to have the secondaries fully opened sooner than 5600 rpms under load
thanks in advance
W

cook_dw

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Re: Which Vacuum secondary spring are you running on 4053-DZ 780
« Reply #1 on: May 12, 2022, 04:30:16 PM »
What color spring are you running currently?

This is the basic secondary spring chart from Holley.  Iíd suggest getting a spring kit and a quick change cover to dial it in and then swap back to original top if you truly wanna tune the carb.  If those arenít satisfactory then go to a mechanical secondary carb.
If you have solid lifter 1967 - 1969 Camaro please contact me as I would like to add your car's info to my database

camarodata@gmail.com