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  1. ButchM

    Did this K20 come factory with catalytic converter?

    Jake As I recall advancing timing lowers CO, CO2 and HC. It also raises NOX but it doesn't look like they are measuring that for you. It used to be a balancing act between the four. If you are not limited by number of failures I would recommend: - New air filter, spark plugs - You can test...
  2. ButchM

    Did this K20 come factory with catalytic converter?

    Paul This is the body type chart for 84, yours is an 03. This is the exhaust parts illustration for the LT9 engine. These are the emissions control parts. B
  3. ButchM

    Did this K20 come factory with catalytic converter?

    Paul I'll dig up all the info I can and get it over to you later today or this evening. Butch
  4. ButchM

    What is this 2 prong Plug above the oil filter?

    We had a new 84 K10 the Mrs drove as I was gone much of the time in the navy. One day while home, she mentioned that there a weird flashing light on the dash. After checking everything out it was 2 quarts low on oil. Truck wasn't even due for its first oil change. That how we found out it...
  5. ButchM

    Did this K20 come factory with catalytic converter?

    Todd Apologies, I had not expanded the post you replied to. Thanks B
  6. ButchM

    Did this K20 come factory with catalytic converter?

    Post #7 is from Juke22, who I sent the parts manual pics for his 86. Post #23 from Paul @84GMCSierra is asking for charts for his 84. That's who my SPID question was directed to, just trying to help out fellow ol truck lovers. Doesn't seem right to be calling the 86 crew cab an ol truck. I...
  7. ButchM

    Did this K20 come factory with catalytic converter?

    He said the under hood sticker was missing. I was asking about the Service Parts Identification sticker/label that should be on the inside of the glovebox door. I will list the engine code (LT9,LS9,LE8 etc).
  8. ButchM

    Did this K20 come factory with catalytic converter?

    Paul Are you wanting the exhaust system diagram from the parts manual like I sent for Juke, for your 84? If so, which engine does yours have LT9,LS9? The engine code will be on the sticker in the glove box. Butch
  9. ButchM

    Did this K20 come factory with catalytic converter?

    Ricko is not off base with his recommendations. If you have a place that says you just need "this" (cats, or fill in the blank) to pass; you may be better off taking that route, assuming its not stupid expensive. If the guy wanted to be a butt it would all have to be near like it left the...
  10. ButchM

    Did this K20 come factory with catalytic converter?

    Juke Your truck is referred to in the GM parts manuals as an "03" body (2 door fleetside). The option label in your first photo shows it has the LT9 5.7L/350 engine and C6P heavy duty chassis. Hope these help Butch This page from a 1991 GM parts manual shows the codes "K2" and "03" for the 2...
  11. ButchM

    Did this K20 come factory with catalytic converter?

    Juke The best answer to any questions asked about engine originality is "I was told the engine was been rebuilt" nothing more. Butch
  12. ButchM

    454, 1987, lower oil dipstick Bolt

    Apologies, came across this late. Been wrapped up in prepping and eating WAY TOO MUCH turkey and fixins. The parts manual (pics attached) says for an 87, part number 56, the bolt that holds the dipstick tube to the block is a 5/16-18 x 1/2". Hope this helps. Butch
  13. ButchM

    Mystery Tachometer

    Pete You have a hybrid/Frankendash. The clock is an option (don't have the option code) for "regular" pickups (C/K10-30). The tach you have is from a C50/C60 series medium duty truck with a 366 or 427 engine with air brakes. On those trucks there was an air pressure gauge where your clock is...
  14. ButchM

    Mystery Tachometer

    Jimmy That was installed on medium duty trucks, C50/C60.
  15. ButchM

    QJet Questions

    Kilian What he said. Using a battery charger as a power supply is pretty much never a good idea, use jumpers from a battery. Battery chargers were not meant to be power supplies and can (have) give confusing/ambiguous results while troubleshooting. As for the choke coil, I would first check...
  16. ButchM

    Hello from Idaho

    Aurora Girl Welcome from Burley Idaho, sitting on the mighty Snake river (yes, same one Evil Kin... (what's his name tried to jump back in the 70's) . If you believe half the gunk on that link you shared, well.... bless your heart.
  17. ButchM

    Passing CA Smog help - High HCs

    Matt Don't give in to the b@$t@rd$. If you have a knowledgeable q-jet person available I would recommend using them. Q-jets came on 305-454, cars, trucks and land yachts. if you got one from the wrong engine size it could have wrong jets, primary metering rods, secondary metering rods or...
  18. ButchM

    Passing CA Smog help - High HCs

    DD He's trying to pass CA smog. If its not set at the setting on the smog label (or whatever the spec is for that year) he will get dinged and/or fail. On carbureted vehicles they used to put a timing light on and check it, been 20+ years but I would assume they still do. Butch
  19. ButchM

    Passing CA Smog help - High HCs

    Testing "hot" (as in drive around for 20-30 minutes) is for a few reasons: - If it has cats, it lets them get up to operating temp (minimum 600 deg F if I recall correctly) so that they're doing their conversion thing and not passing along unburned fuel = high HC on test. - It lets the engine...
  20. ButchM

    Lifted Dually Suburban wheels/tires?

    BearKing I have a 1986 3+3 that I bought in 1988. In 1990 I had a run-in with a drunk that resulted in me having a virtually totaled truck to fix/get back on the road. Both front leaf packs were bent sideways and one rear main leaf was twisted The driver side rear leaf pack exploded and was 10...
  21. ButchM

    Transmission Identification

    Its a TH200. The CY code puts it between about 1976 and 1981. Def a Chev bell housing. Not a boat anchor necessarily. The best bet for this, IMHO, is to look for it a home with a circle track or drag racing group. These are popular with some of them due to the light rotating mass... like a...
  22. ButchM

    Loss of power and shaking

    Mats, (based on my past experiences) with normal start, idle and stop and revving in neutral, sounds like your basic mechanical such as timing chain slipping etc are ok. The idea of putting a vacuum gage on for a test drive is a good recommendation. You just need a non-ported (below the throttle...
  23. ButchM

    Qjet to Edelbrock 1400 vacuum line puzzle- I need help

    I hope one of those will get you to the link for the manual and it will help.
  24. ButchM

    Qjet to Edelbrock 1400 vacuum line puzzle- I need help

    http://www.73-87chevytrucks.com/techinfo/7387CKMans//Service/ST_330_77_1977_Chevrolet_Light_Truck_Service_Manual.pdf http://forum.73-87chevytrucks.com/smforum/index.php?topic=28123.0
  25. ButchM

    Qjet to Edelbrock 1400 vacuum line puzzle- I need help

    Fig CL31 is for CA HD emissions with A/C. I believe the figure you had was CL 30 for non A/C trucks. It appears the diff is the addition of a spark control switch. I hope this helps.

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