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  1. CorvairGeek

    Mystery valve... came out 78 400 th350

    Computer Control Command is the GM name for the electronic feedback fuel system starting (U.S. Federal emissions) with cars in 1981 (similar for Cali in 1980). Heavy Duty emissions is kind of a misnomer. They were easier to meet standards, for higher GVW trucks that were phased in over the...
  2. CorvairGeek

    Mystery valve... came out 78 400 th350

    That's from a CCC system, or from a truck with HD emissions with the little controller box on the firewall (possibly).
  3. CorvairGeek

    AC HELP NEEDED..

    Here is the sadistic GM sealing washer chart. I had to fix a leaking O-ring (the swtich port) on my R4 this year. Surprisingly, NAPA had a listing for that particular O-ring and the yellow and green (IIRC) sealing washers I needed. Additionally, an old A6 compressor would have value to some...
  4. CorvairGeek

    85 C20 LWB eight lug bolt pattern compatible late model chevy

    Yep, shockingly easy.
  5. CorvairGeek

    another elco

    If you still have a good A6 compressor, I can't say enough good about the double lip shaft seal that can be installed in place of the ceramic shaft seal and 'bird cage' assembly (as well as later single lip seals). It's funny that GM finally came out with a great front seal that fits compressors...
  6. CorvairGeek

    85 C20 LWB eight lug bolt pattern compatible late model chevy

    I had to go to the Boise and Nampa stores both to get 32 of them. I was shocked they had the SAE threads for the studs and the external thread that fit the matching center caps. The had them readily in the lug nut bins they sell for replacements. This was back in 2009. They are a 7/8 inch hex...
  7. CorvairGeek

    85 C20 LWB eight lug bolt pattern compatible late model chevy

    That's my C20 in the background with 2002 3/4 ton aluminum wheels. Got the lug nuts from Costco (of all places).
  8. CorvairGeek

    This genuinely offends me

    Might need a tetanus shot after a test drive.
  9. CorvairGeek

    another elco

    It's been de-choked!
  10. CorvairGeek

    Thermostat opening and closing to much..

    At least it reads something. Your oil pressure gauge of that vintage Ford has a resistor across the back, and it is tied to an warning light oil pressure switch (even says so in the shop manual). Took 2 tries for me with different older sending units to make the gauge imitate the mechanical...
  11. CorvairGeek

    Thermostat opening and closing to much..

    Cheap thermostats can cycle like crazy too. I only buy OEM or 'high accuracy' units now.
  12. CorvairGeek

    What is this?

    It looks like a TVS to me as well, as described. It looks like the larger fitting for a water jacket, but it appears low on the block where the oil galley is on the L6. The 49 state 250s were really odd and vacuum nightmares without the CCC or EST systems in the last years of production (for...
  13. CorvairGeek

    Help! Carburetor on 250 I-6

    You aren't kidding at all there. The same style, first generation Multitec injectors are also used in the Buick 90 degree V6s. Random misfires and ones that short out hot, killing the engine, but 'unshorting' when they cool off are awesome. Since it is multiple port and not sequential, it kills...
  14. CorvairGeek

    Help! Carburetor on 250 I-6

    Sad but true :) I will keep my eye out for the W-body sensor. I've gotten some requests elsewhere I'm trying to fill as well. I can still access 90s vintage stuff here in the desert (sometimes older too) that people haven't seen in years in many areas of the country.
  15. CorvairGeek

    Help! Carburetor on 250 I-6

    I like the way you guys think! My intent was also to keep CFM and fuel flow more comparable to the original design for my unmodified 292 (though it does have the later HUGE outlet exhaust manifold) for maximum efficiency and drive-ability. I chose the odd, smaller 2V version of the GM TBI (3.1...
  16. CorvairGeek

    Searching for an AC switch

    I hadn't noticed that time gap from the original post... I was hurrying before work to look up a switch that was fairly universal thinking someone was needing a quick answer ;)
  17. CorvairGeek

    Searching for an AC switch

    Here is a very universal one that even GM used for a few years on factory systems.
  18. CorvairGeek

    Searching for an AC switch

    That is the thermostatic cycling switch, with the fan resistor pictured above it. It has a capillary tube that goes around a cold pipe of the evaporator and it wrapped with 'dum dum' aka prestite tape. Can you estimate how long the capillary tube is, and is the switch a fixed value (it may have...
  19. CorvairGeek

    What is this sensor?

    If you look carefully at the corresponding connector on the wiring harness, many GMs could plug into both the button style connector (like shown) by plugging on to the sensor perpendicular (with the little half circle cut out in the connector), or plugging straight on to a spade style connector...
  20. CorvairGeek

    gm big block v6?

    The back half is at the yard on Garrity. An entire '64 Corvair is on an elevated stand in front of the State St. location.
  21. CorvairGeek

    gm big block v6?

    Here is the V12 that has been on display in front of one of my favorite U-Pull-Its for decades.
  22. CorvairGeek

    Long Time Lurker

    Thanks goodness for that! What carburetor is on your Offenhauser intake manifold? You are right about a 292. You can conceivably make a 292 out of the shorter deck block, but I understand the connecting rod angles are not good, unlike with the taller block. Here is my 292. You can see the fuel...
  23. CorvairGeek

    Anyone ever seen or messed with a GM 4L30E?

    Most immediate failures are far better that getting 'the phone call', after the catastrophic damage has occurred to the wife, daughter, son, etc.
  24. CorvairGeek

    Anyone ever seen or messed with a GM 4L30E?

    GM made a mechanical asshole version of the 4T65E for Volvo too. https://tripleedgeperformance.com/Volvo-Transmissions.html
  25. CorvairGeek

    '89 Celebrity Wagon

    GM assembly plants have a long history of torch work. When Corvairs had factory A/C ('65-'67), the 3 holes for the vents in the metal dash (and elsehwere) were cut out with a torch! Same for the openings for front door speakers with stereo ('65 -'69). Isuzu Diesel powered Chevettes ('81-'86...

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