Holley 4604 3-Barrel Experience?

Discussion in 'Holley' started by Mark G, Apr 12, 2017.

  1. Mark G

    Mark G Active Member

    Anybody have experience with the Holley 4604 3-bbl on a big block Buick? They are rated at 1050 CFM, but I have heard the vacuum secondary opening rate is not easily tunable, as compared to the Q-jet air valves.
  2. doc

    doc Well-Known Member

    I have run 3 barrels on nailhead buicks for years... dont believe all the crap you hear.... they ran good and the only tuning I had to do on the secondary was to just stretch the spring some to make it come in at a higher rpm.... and on the nailhead at least,,, had to keep the manifold heat in so the cat pee fuel we get now will vaporize....

Share This Page