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  1. Bextreme04

    Quadrajet Primary Shaft Bushings

    Gravity... If there is any little bit of a leak on the check valve in the pump, it will siphon the fuel right down to the air break point in the fuel bowl. So if you have the full height solid seat, that amount is the full seat height. If you have windowed it, now that amount is all the way to...
  2. Bextreme04

    Quadrajet Primary Shaft Bushings

    The windowed seat does allow more flow, which is good for performance builds, but the downside is it can allow the bowl to drain back more and therefore is not recommended for stockish street builds. If everything is tight and working right, it isn't really a concern, but if you have the...
  3. Bextreme04

    Drive shaft too short

    It's impossible to tell from your pics if it is even short. You should be able to unhook the driveshaft from the axle and then bottom out the yoke in the trans. make a mark on the yoke where it sits on the seal when bottomed out, then pull the yoke out enough to reconnect it. You should have...
  4. Bextreme04

    Rochester Quadrajet Woes

    Its not "air" that you need. It's "compression". Yes.. you do need air, but if it is being allowed to come in to the engine at the wrong time, you won't get any compression and it won't matter how much fuel or spark you have. In these cases I usually pull the plugs and inspect them. Check for...
  5. Bextreme04

    Rochester Quadrajet Woes

    Its not that you NEED the fiber floats. What he is saying is that they react differently and if you don't know what you are doing it becomes a problem. The setup instructions for setting float height are designed for a fiber float. The brass floats are heavier and don't have the same buoyancy...
  6. Bextreme04

    Rochester Quadrajet Woes

    To mimic the OEM electric choke trucks, it is recommended to wire that through an oil pressure switch. This will only provide power to the choke to pull it off when the engine is running. If you just run it through the ignition power you can't sit for any amount of time with the key on and...
  7. Bextreme04

    Rochester Quadrajet Woes

    The electric choke conversion for your Q-jet just replaces the thermostat bolted to the manifold with an electric one. You don't actually change anything on the carb itself. https://quadrajetpower.com/electric-choke-conversion-kit-chevrolet-350-400-71-78/
  8. Bextreme04

    Fuel problems

    It sounds like you have the return lines swapped on the valve or the valve is not switching properly. Make sure that the feed and return are going to the same tank in both switched positions(preferably by manually checking to make sure you have a continuous flow through the valve at only one...
  9. Bextreme04

    Rochester Quadrajet Woes

    This is a pretty good description of what should be happening, but I'll add a few caveats. Early quadrajets like this one only had one pull off on the front. That still appears to be present. The pull off actually keeps the rod from being able to extend when a high engine vacuum is present and...
  10. Bextreme04

    Big block running hot. Can’t figure out the issue

    oof... bummer. Glad you checked it though. If you had it dialed in near sea level and are now in Denver, I would start by dropping 2 jet sizes while you have it apart and see what you get. Since it will be apart to re-seal the plugs, you can just check to see what they have in there now and then...
  11. Bextreme04

    4.8/5.3 to 383

    You aren't going to get 383 actual displacement from an LS unless you start with an actual LS1. The math just doesn't work out for any other LS engine. TSP and several other manufacturers make actual 383 stroker kits for LS1 blocks...
  12. Bextreme04

    Big block running hot. Can’t figure out the issue

    Not necessarily. 14.7:1 is stoich for pure gasoline. Pure ethanol is 9.003:1. Almost all gasoline sold in the US is now E10(roughly 10% ethanol content), which usually drops the stoich ratio to ~14.1:1. That is crazy rich. That's rich enough that I'm surprised you don't have a hard time getting...
  13. Bextreme04

    Big block running hot. Can’t figure out the issue

    This is a serial flow block. Notice the lack of coolant holes on the exhaust side of the block surface below the head bolts in between the cylinders and also the large/small holes at the rear of the block deck surface. The correct series flow gasket will have matching holes just like the one...
  14. Bextreme04

    Big block running hot. Can’t figure out the issue

    It's impossible to know what the right head gasket is without seeing what the block surface looked like. Do you have a pic of it before you installed the heads?
  15. Bextreme04

    Big block running hot. Can’t figure out the issue

    There are two different things happening here. First, the regular rotation and reverse rotation water pump does not change the coolant path. It only changes the way the pump moves the coolant through the same path because the pump rotates the opposite direction on the serpentine belt systems...
  16. Bextreme04

    Help with starting 79 k20 400SBC

    To be more specific, that is only chlorinated brake cleaner. The PERC that is contained in the chlorinated cleaners is a major carcinogenic substance and can indeed turn into phosgene when burned.
  17. Bextreme04

    Gas hog

    I'm in Salem and am still running a 350 with 9:1 compression and a summit K1102 cam. I've got the factory quadrajet on it and it has been dialed in with an AFR meter and is right on. I get ~8MPG towing and around 10-11MPG just driving around. I'm on 35's with a TH400/NP205 combo, so I get all...
  18. Bextreme04

    What have you done to your square lately??

    Finally got around to cleaning out my shop enough to get the truck pulled in. I bought a truxedo cover for it earlier this year and also new high strength tailgate mounts. I'm supposed to be heading out hunting this weekend and we are in the middle of an atmospheric river, so I wanted the bed...
  19. Bextreme04

    Gas hog

    Weather got cold up here recently and they probably switched to winter blend now, which will show a few MPG lower. Your stumbling at idle makes me think vacuum leak though. Start it up and spray some carb cleaner all around the intake manifold and see if you notice an RPM change. What part of...
  20. Bextreme04

    Shop heater

    I put a heat pump in mine after just using a portable propane one for years. It was kind of a fathers day gift to myself. ~$600 and it keeps the shop ~64 degrees in the winter and 75-ish in the summer to conserve the energy usage. I installed it myself and most of them come precharged, so you...
  21. Bextreme04

    Fuel economy C10 with carb

    No, lower mileage in winter has nothing to do with ethanol content. You can actually get BETTER fuel mileage with a higher ethanol content up to 30% if you are properly tuning for it... but legally there is never more than 10% ethanol content in your fuel anywhere in the US unless it is E85 or...
  22. Bextreme04

    New build 454 and the wife hates the exhaust smell

    The answer is yes, cats will absolutely reduce the smell. I have dual 3" Flowmaster high flow cats on my 2011 Burb and still get a small bit of exhaust smell because they aren't enough for a slightly angry 6.2L. You don't have any need for a high flow cat on your application. Modern federal...
  23. Bextreme04

    More shop

    These guys are right down the street from me. They seem to do a decent job and the price isn't too crazy.
  24. Bextreme04

    What have you done to your square lately??

    I rebuilt mine a few years ago because it was leaking around the input shaft. I did a full rebuild and then did the proper adjustments per the original instructions. It was a little bit tighter and didn't leak for a few months, but then it started leaking again worse than it had before. I...
  25. Bextreme04

    This one needs to go, asking for opinions. Offering it up here first.

    Honestly that isn't the real issue. If you have appropriate sized mud flaps on it, regardless of lift, it is no better or worse than any other stock vehicle. The real problem is a 12" lift with 40" tires that stick out 6" past the fender and also have no mud flaps on it at all. Even with no lift...

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