For a pontiac, this requires draining (or partially draining) the coolant enough that removing the intake does not cause drainage from the water crossover in the front of the intake. Carbide Burr set (you may want to use both a cylindrical shape one as well as a small ball or tree shaped one to finish off corners)įirst, do not modify the intake on your vehicle! First think you need to do is remove the intake manifold.Die grinder (powered by an air compressor recommended).Reciprocating saw (Sawzall) with bi-metal blades.Here’s the short list of tools necessary: ![]() Modifying a factory intake is not hard and only requires a few tools. ![]() Please note that your intake’s runners may be positioned differently thus requiring different attention where to modify. Modifying a spread-bore intake for other manufacturers will more than likely be slightly different. Note that these instructions are for modifying a Pontiac intake designed for a Quadrajet spread-bore carburetor. The results are in, the car runs smoother than ever and I can now mount my shaker to the throttle body using the factory air cleaner base! Modifying a Pontiac Quadrajet intake to accept a square bore throttle body You may have to do a little fab work to hook up a cheap, readily available solenoid on your carb.I finally got around to modifying my factory 1972 Pontiac Quadrajet spread-bore intake to accept the square-bore FiTech throttle body EFI. Then switch it off when carb is warm and it's not needed.ĭon't know exactly what type of solenoid will fit your carb. So, you can wire one of these up with a toggle switch. They were designed to keep the idle speed up, when the AC compressor is kicked in. These were used on lots of engines, in cars that had air conditioning. (3) Install a properly functioning electric idle stop solenoid. (2) Set the idle screw for the hot idle speed you want, then keep the engine running with your accelerator pedal, til it will idle without adding any pedal. (1) Experiment to find the lowest position which will still keep the engine running when cold-IF that setting doesn't give you more hot idle than you can live with. But, if you don't wanna have to open the hood, for adjustments, I suppose there are at least 3 options. In post #13 of the thread I'll link is a description of how to adjust the idle mixture screws, by a good carb guy.Īs I've probably mentioned, I adjusted the throttle screw for cold idle, then backed it off after the carb/engine warmed up. You'll have to adjust your idle function, with the throttle adjustment screw, and the idle mixture adjustment screws on the front of the carb. Or, in other words, make sure that no part of the choke system will affect the carb function, at all. This can cause an idle which is too high. And make sure the choke high idle mechanism is not holding the primary throttle blades open. :yesĬlick to expand.Make sure the choke flap is held completely open. That's what I did to all TJ's street Pontiacs, here in LA. ![]() !/A-Pontiac-1968-1972-Quadrajet-electric-choke-conversion-kit/p/60306004/category=16728003īut, if you won't be driving in cold weather, you may wanna just disconnect or modify the choke linkage so that the choke flap stays completely open at all times. These cost lots more than the hot air conversions. If you have a hot air style choke, there are cheap electric choke conversions, which will eliminate the heat tubes.Īnd, if your carb uses a divorced choke, there are elec choke conversions which bolt to the carb, rather than the intake. ".How is the choke going to operate if I block off those passages?.Not really wanting to spend money on a carb with a different style choke." This will prevent the the exhaust gases from burning the gasket. ".Does it go on the head or the intake side of the gasket?."
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