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Pontiac of the Month

Jack Leslie's 1957 Sedan Delivery

2024 April
of the Month

Last Indian

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Posts posted by Last Indian

  1. 22 minutes ago, Fabio Parede said:

    My car is runnig up to 210 F when in trasit. Sometimes increases. On the road, up to 60 mph about 170-180 F. I have a brand new radiator, a new water pump (Like original 11 bolts and cast impeler), a thermostat for 180 F (but not for high volume), original pulley, shroud in place, fresh new coolant, 16 lbs radiator cap. I tested the temperature indicator and its ok.

    I have a Holley 0-80555C 650CFM Spread Bore Electric Choke Vacuum Secondaries

    I don´t know where to look first. I´ll appreciate any help

    A couple thoughts. First it may be the fan. You should run a 7 blade fan on a clutch thermostat housing that mounts to the water pump hub. By your description it sounds that the system cools properly when moving enough air through the radiator. The fan I described will make a huge improvement at low speeds & help to pull down temperature when temperatures rise above the set point of the thermostat clutch housing. Also how many rows is the radiator? A larger radiator, like a 4 row may help as well, but I would start with the fan & clutch housing.

    • Like 2
  2. To explain a little further, CFM ratings are misleading when not viewed in relationship to the entire system! Manifold, heads, exhaust & the most always forgotten air inlet setup. Your 400 cid engine will flow about 500 to 550 CFM! But restricted inlet or outlet will reduce that number. Yet that restriction translates to a lower output number for the carburetor, because it can’t flow more fuel in a Venturi effect since the air flow isn’t there! Additionally the front two barrels or what are called the primaries only flow about 500 CFM! 
    Your carb is not to big! You may need to change jetting, but you’ll only be able to determine that after you do the needed work to determine the problem.

    • Like 2
  3. 11 hours ago, Matador red said:

     

     

    Have eldelbrock 750 comfy carb on it now bought new 

    I thought carb was too big will get with eldelbrock never thought of that or get smaller cmf carb thanks I needed a second opinion just confused 

    Yeah, sorry I have to disagree with Kiwi. That carbs not to big for that motor with the cam you say you have! Especially the primaries! Which is predominantly what you run on, unless you have your foot to the floor all the time! There is something else going on! So I repeat we need more info. You say comfy carb, but there is no Edelbrock carb called comfy carb, so what carb part number is it? I still suspect you have the secondaries connected to the wrong vacuum! We can’t help if you don’t answer the question.

    • Like 2
  4. Wow that’s a whole can of worms to open up! Frosty’s right, to much fuel and no the carbs not too big. So some questions are in order! How does it run? Sputtering, boggy, good, bad what?  I know edelbrock carbs, but I’m not familiar with a comfy carb by them. Still several things come to mind. If it is an electric choke is it working right? Vacuum secondary’s? Are they connected to the right vacuum source. The base gasket, these often cause lots of problems if it doesn’t complete the right connection between the carb & the manifold. Also some manifolds can’t be used with certain carbs because of their design and the carbs design.

    So can you give us more info? I presume the manifold is a performer rpm air gap? Right? But can you give us the actual carb model. 

    • Like 2
  5. 2 hours ago, TreydoggTX said:

    Hello I'm looking for advice.  Have a 2007 pontiac g6 gt. I worry about the top malfunctioning and I want to do as much prevention as possible. I have the oil for the pump I haven't tried to add any extra oil. So far the top has been working fine.  

    If your top doesn't come up is there a manual way to bring it up?

    Unfortunately there is no provision to operate the top manually. So much so that if the top is in between full up & full down the vehicle must towed by flatbed & must be facing backwards to prevent a lift effect resulting in damage.

    • Sad 2
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