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  1. legend57

    Passing CA Smog help - High HCs

    For those switching from Edelbrock to Qjet, here is the parts list I've come up with (so far); Choke: Since the Qjet 4MV carb has a divorced choke (and I don't have the choke) I am going to try one of these out; https://www.carburetor-parts.com/choke-kit-cu1445 Hard Fuel line from pump to...
  2. legend57

    Passing CA Smog help - High HCs

    Yes, that is the kit. Maybe they figured out an offset to apply given the O2 being added from the air pump. I found a couple of threads where someone had trouble with it, so I hesitated to go down that path. Given the O2/fuel ratio is fundamental to how the fuel injection works, I'm just not...
  3. legend57

    Passing CA Smog help - High HCs

    I extensively researched about the smog compliant MSD fuel injection kit. I was very close to ordering one a while back, until I learned that it won't work if the truck has the smog pump that injects air into the manifolds. It messes with the O2 reading. It is too bad that options to actually...
  4. legend57

    Passing CA Smog help - High HCs

    I just ordered one of the National rebuilt 4MV carbs, #ND4528. I'm not familiar with the Qjets, so need to research all the port connections.
  5. legend57

    Passing CA Smog help - High HCs

    I'm monitoring this thread closely as I'm in the same boat. My '76 K20 has the heavy duty emissions (no EGR, no CATS), and I also went with the Edelbrock 1400 carb. I'm still building the truck, so haven't gone for smog check, but I guess I can now see the future (fail). I'm wondering if we'll...
  6. legend57

    Np203 to 700r4 brace

    That's what I did (see attached pic)
  7. legend57

    I’m interested in swapping out the TH350 for a 700R4

    I'm in the process of installing a 700R4 between a 400sbc/NP203 in my 76' K20. I went with Gearstar for the transmission and they built it to handle the torque (Level 3). I'm extremely happy with the kit and quality of the work so far. I haven't driven it yet, so that review will come later...
  8. legend57

    New member from California

    Great looking rig! From a neighbor, just a few hours north.
  9. legend57

    Fixing vapor lock now that I barely made it home, experience with 3 port filters?

    Before you start changing things, you may want to add a fuel pressure gauge near the inlet of the carb to monitor. Check it occasionally during a drive and see if it changes. I had a similar issue, but it ended up being sediment in the tank that would slowly gather on the filter sock in the...
  10. legend57

    Hello Squarebody lovers

    Welcome from CA!
  11. legend57

    350 TBI in California

    I'm in the same boat with smog, but my truck is a '76, first year requiring smog in CA. (I'm in San Jose, CA). I'm using the AFR heads, which are some of the best out there (IMHO), and they have a CARB EO, #D-250-2. https://www.airflowresearch.com/chevy/sbc-eliminator-23-cylinder-head/ Note...
  12. legend57

    New Member and new owner of a 1976 K20

    Hey All, Thought I'd provide an update on the build. I took the rolling chassis with the Cab and Bed over to the body shop earlier this year. He replaced the passenger floor pan, repaired the cab corners, and repaired the rust spots on the Firewall. He then went to install/fit the new doors...
  13. legend57

    SBC Cylinder Head Decision

    I ran a Comp 270H on a 400ci SBC in my '57 Chevy for years. Great cam in that car. In my '76 K20 I'm building, it too has a 400, but I'm putting the AFR 195s on it. After talking with quite a few folks, including the engine builder, he thought the displacement warranted the extra volume. The...
  14. legend57

    400 SBC Compression Ratio

    I have a mildly built 400 in my '57 Chevy and just did a compression test on all cylinders just to check engine health. With the engine cold, all 8 cylinders ranged from 170-180psi. It is best to test with the engine warm, but I was just looking to see what the variation looked like. The...
  15. legend57

    Runs smooth, then sputters, then smooth, then sputters

    I had a similar issue on my '57 Chevy years ago when I had crud in the gas tank. It drove me crazy because it was intermittent. The crud will collect on the sock in the pickup, and then slosh off, end then collect again at random times. I went crazy chasing down ignition and carb ideas. I...
  16. legend57

    Electric Fan Conversion

    I had a very good experience with replacing my clutch fan in my 1993 Chevy K3500 with a 454. I used the Flex-A-Lite direct fit dual fan with controller set up. It performed significantly better than the stock set up. With that success, I'm using the same set up on my current build, a 1976 K20...
  17. legend57

    How close are the aftermarket doors?

    I recently purchased a set of the AMD doors for my '76. We'll be fitting them soon. Out of the box, they appear to be very high quality. I'll report back on how they actually fit the cab.
  18. legend57

    Haynes manual suggest silicone dielectric grease for ignition module?

    I've experienced the same failures in the past. Always used the thermal paste, but still had failures with store brand modules. I stick with AC Delco because they tend to last longer. I still keep a spare in the glove box. I found this interesting article...
  19. legend57

    Keeping it in the family. My grandfather bought this 78 GMC brand new. After his death it sat for 18 years. I finally got ahold of it 2yrs ago, and ha

    Great truck! Welcome from San Jose, CA. More pics please :)
  20. legend57

    New Member and new owner of a 1976 K20

    Inspiration indeed! Thanks for the pic. That is really close to what it'll be like. The light green along the middle will be white, but otherwise, that's it!
  21. legend57

    New Member and new owner of a 1976 K20

    Thanks. BTW, sweet C4. My favorite color on a Vette.
  22. legend57

    New Member and new owner of a 1976 K20

    I think you were referring to the 700R4(?). Yea, I know they are definitely on the delicate side. My personal experience with a 700R4 behind a 400SB has been pretty good for about 20 years in my '57 Chevy. I know its a different beast, but I sure love that overdrive. I'll just have to always...
  23. legend57

    New Member and new owner of a 1976 K20

    Next steps (roughly): 1 - Rust repair: Before I assemble much more on the chassis, I want to get the rust repair work done on the cab and have the firewall painted. I'm hoping to have the truck picked up within the next month to get that done. 2 - Drivetrain install: Once it comes back...
  24. legend57

    New Member and new owner of a 1976 K20

    The transmission/t-case: Of course, the original set up was the TH350 with the NP203. I'm looking to make this a good driver and don't plan to tow anything heavy or any heavy off-roading, so I really wanted to get the RPMs down on the freeway. I choose to go with a TH700-R4 transmission from...
  25. legend57

    New Member and new owner of a 1976 K20

    The engine: Ok, so I already mentioned I found an original 400. Since I'm in California, I need to build it and meet the heavy duty emissions requirements. So, I need to keep the smog pump, air tubes, and PCV valve. No cats and no EGR were on the heavy duty emissions for 1976 K20...

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