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  1. Photon440

    Holley 4 barrel in stock '69 318

    Those adapters work both ways, I have a couple of them. They will indeed allow a four barrel carb to work on a two barrel manifold. Perhaps it was poorly described in the Amazon page, but on their own site it mentions that: Spectre's universal Carburetor Adapter is designed to adapt 4 barrel...
  2. Photon440

    Holley 4 barrel in stock '69 318

    Well hi there, how are you? If I was putting a 4 barrel carb onto a two barrel manifold, I'd use something like this...
  3. Photon440

    Confusion on Fuel Line I.D. and O.D

    I guess it depends on whether they consider the fuel line to be a pipe, or tubing.
  4. Photon440

    Rebuilding carburetors at home

    Some of the tools used to clean paint guns will also work on carbs. www.amazon.com/DESIN-Carburetor-Cleaner-Airbrush-Cleaning/dp/B09V2W31LR/ref=sr_1_1_sspa?keywords=carburetor+jet+cleaner&qid=1704564218&sr=8-1-spons&sp_csd=d2lkZ2V0TmFtZT1zcF9hdGY&psc=1
  5. Photon440

    Removing Fuel Pump on GTX

    If you don't feel like rebuilding it, these look about the same. https://www.yearone.com/Product/challenger-cuda/af89/#prettyPhoto
  6. Photon440

    Carb question

    It usually opens up the choke plate about half an inch, but doesn't hold it all the way open when cold.
  7. Photon440

    Thermoquad replacement suggestions

    The nitrogen is a factor because it expands when heated up by the burning oxygen/fuel mix, helping force the piston down. Just like water, which doesn't burn, can increase thrust in a jet engine with water injection.
  8. Photon440

    Thermoquad replacement suggestions

    Oxygen is closer to 21%, nitrogen is 78% and the third gas is argon, at about 1%. The rest are, as you say, trace gasses. We're talking dry air, of course, since sometimes there is a lot of moisture in the air as well.
  9. Photon440

    Thermoquad replacement suggestions

    The size of the fuel bowl isn't a flaw, it didn't keep big block GM musclecars from completing quarter mile tests for the magazines back in the day. Of course, restrictions in the fuel lines should be avoided in any application, regardless of the carb used. If you need a large fuel bowl to act...
  10. Photon440

    Ported vacuum advance or manifold. Let's debate!

    Be sure you try it for a full five years. :)
  11. Photon440

    Thermoquad replacement suggestions

    A working fuel pump would fix that problem.
  12. Photon440

    Thermoquad replacement suggestions

    It comes down to the right number of properly distributed fuel molecules to combine with those oxygen atoms.
  13. Photon440

    Thermoquad replacement suggestions

    VE is still a useful measurement for showing the efficiency of the flow of an engine, so knowing that a 400 c.i. engine has an 80% VE, then you can figure on it being able to ingest 360 c.i. of air with every two rotations. Mass is also useful to know, but it changes with altitude, temperature...
  14. Photon440

    Thermoquad replacement suggestions

    One of the classic arguments over using larger carbs is that the standard speed shop formula (Cubic Inches x RPM x Volumetric Efficiency ÷ 3456) gives a smaller number than people had expected, and the larger carb seems to work out just fine. But that formula is flawed; it would theoretically...
  15. Photon440

    Carter AVS 4737S 1970 GTX 440 4BBL

    That is partially correct. Both the AFB and AVS have vacuum controlled secondaries. The bottom throttle plates open right away upon full throttle on both types, but the secondary control air flaps are opened by air flow. The AVS flaps are kept closed by spring pressure, easily adjustable...
  16. Photon440

    Carter AVS 4737S 1970 GTX 440 4BBL

    There is no secondary accelerator pump on that carb.
  17. Photon440

    Carter AVS 4737S 1970 GTX 440 4BBL

    Have you made sure that the secondary air valve isn't opening too soon? You say the carb was rebuilt, did you do it or was it done by someone else? I wonder if the proper leather pump seal was used, some kits use neoprene. Also, inspect the 'S' shaped linkage that connects the accelerator...
  18. Photon440

    Ported vacuum advance or manifold. Let's debate!

    If your country is still measuring octane in RON, that would make a difference in numbers compared to the USA, Canada or Mexico. We use the RON/MON combination, listed as R+M/2, which is about 4 to 6 numbers lower than a RON rating. So if I go to a Chevron and buy our 94 octane, it would be...
  19. Photon440

    Ported vacuum advance or manifold. Let's debate!

    Every engine is different. While it is often accepted that 16:1 - 16.5:1 is a good cruise mixture, and misfiring will start if you go leaner than 18:1, that can vary by things like compression or type of cam. For instance, a high overlap cam can allow increased exhaust residuals in the mix and...
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