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  1. hatzie

    Changing from R12 to R134...

    Make sure you flush all of the mineral oil from the hard parts. You can have cooling issues from leftover mineral oil blocking thermal transfer. Replace the lines with barrier hose rated for R134A. R12 lines are rumored to leak R134a not sure how true that is but it's cheap insurance. Replace...
  2. hatzie

    Np208 transfer case brace

    That's the way mine are.
  3. hatzie

    Np208 transfer case brace

    You will break bellhousings without that brace. You need it. I broke a later bell pattern NV4500 Bell before I wised up and installed the NP208C to Bell brace on my 76 K20 6.5L project. I had a small panic attack when I thought it was the engine side cracked on my pristine 1998 6.5L TD block...
  4. hatzie

    Temperature Gauge Reporting Wrong Temp?

    If you compiled that chart based on readings from your sender it only applies to that year gauge and sender and other model years that used the exact same units. The temp sensors across the model years of these trucks are a conundrum. GM used at least four different temp senders and maybe as...
  5. hatzie

    Square body on new chassis?

    Getting there. Not sure why the guy doing this with the 68 cab didn't just get a stake bed the correct length for the frame he had. Would've been much easier.
  6. hatzie

    12 bolt front axle

    No such thing as a 12 bolt front axle. In 1974 it's a K20 with a Dana 44 HD. Prior to 1977 the Full ton chassis was only 2wd. GM didn't start offering a K30 with the Dana 60 til 1977. That axle still has the slugs for full-time 4wd using the NP203 full-time 4wd transfer case. In answer to...
  7. hatzie

    Pics of tow hooks

    I always thought the Civilian tow hooks were a bit wimpy... If you're gonna do it go all out like the military did in the 80's. You can hook a NATO tow bar to rotate up and down on the clevis pins mounting bar and pull one around. Been there done that. This is the front bumper and clevis...
  8. hatzie

    will a 1977 short bed match a 1986 cab?

    The body lines will match up but you have to deal with the filler necks. The fill hoses on the early trucks were different diameters. The diameters changed after 1980... not sure if it was 81 or 82 or 83. 73-77 had fillers right through the side of the bed with no doors so you can't just swap...
  9. hatzie

    Anyone running a Martin Turbo kit?

    I wouldn't run more than 1100-1200°F pre-turbo and around 900°F post turbo. My 6.5L runs about that when pulling a trailer up a steep grade. I let it breathe afterward by coasting along while not asking much of the engine and it pulls right back down. Oil temp comes up pretty quick too. When...
  10. hatzie

    Tonneau covers

    Irwin Toyota in Laconia contracted someone to spray in Bedliner all the way over the top of the rails on dads' 2005 Toyota Tundra. He has beaten the crap out of that truck for over 400,000 miles. Inside the bed looks just fine. The tailgate is long gone but that was an altercation with a...
  11. hatzie

    Steering torque specs.

    I just downloaded the 86 manual and ran a scan. Nothing is wrong with the manual. DO NOT install any "download managers" or any other software from sites like MediaFire. You don't need them. They are Spyware and Adware vectors or just plain spyware/adware. What are you using as a PDF...
  12. hatzie

    Anyone running a Martin Turbo kit?

    If you run H2O injection to control temps you have to be very careful to make sure you don't run out. That's what killed a lot of the Turbo 215 motors in the 1963ish Olds F85 Jetfire. They got a poor reputation for reliability because most consumers were not diligent about keeping the...
  13. hatzie

    Old gm video about full floaters

    I hadn't realized the full floating axle design was that old... Kinda cool.
  14. hatzie

    Anyone running a Martin Turbo kit?

    The 6.5L turbodiesel blocks have squirters at the bottom of the bores to spray oil into the bottom of the pistons. It cools them off somewhat. The exhaust valves and seats of some turbo motors are Inconel alloy and the more exotic of those are sodium filled to shed heat and put up with higher...
  15. hatzie

    New here / need help

    You're loosing me too... Some marked up pictures would help get everyone on the same page. Not sure what you're calling trays... If I'm correctly interpreting the pictures you posted... It looks like you're calling the valve body a tray. Did someone else pull the pan and lower half of the...
  16. hatzie

    Steering torque specs.

    There should be a 1986 Factory Service Manual in the library. It contains standard service and maintenance info. Steering joints fall into that category. The FSM won't have serious rebuilds of major components like the AC compressor, Power Steering pump, steering boxes, Axles, Engines, and...
  17. hatzie

    Fuel selector valve

    Both valves were made by Pollack. The only downside to ganging two valves would be if the return valve failed so you were filling one tank with the return fuel from the other. I've seen some creative folks plumb a fuel pump from the AUX tank to the main tank. They switch the fuel pump on...
  18. hatzie

    Fuel selector valve

    Nice... Grommet and all. Changing that harness over to use the toggle switch is pretty easy. You need the power connector for your fuse panel... I saw you mention Painless in one of your posts. If you have a painless wiring ATC/ATO plastic fuse panel you won't need to change anything on the...
  19. hatzie

    Fuel selector valve

    I'm not the best teacher there ever was. I tend to leave things out that are obvious to me... I PM'ed @gmachinz about what you might need to do this the easy way... buy a semi-custom sub-harness already setup to plug into your rig using the motorized valve and the Polarity reversing toggle...
  20. hatzie

    Fuel selector valve

    I thought you had a single tank truck... If you already have that switch mounted in the dash you have a square hole. Unless you want to weld up the hole and drill a 1/2" hole I'd use the 87-91 AC Delco D7089C rocker switch. You may have to open up the hole with a file and re-paint the exposed...
  21. hatzie

    Fuel selector valve

    AC Delco 467513 has been obsolete for many years. There are ZERO aftermarket direct equivalents. You'll get severe sticker shock when you see the price on auctions for that part. Install or build the later harness and use the 6 port motorized Pollack valve you already have. You can buy that...
  22. hatzie

    Fuel selector valve

    Toggle switches are easier to install and more reliable than the stock rocker switches. You can drill a 1/2" hole to use a polarity reversing toggle switch.... Like this one. https://www.amazon.com/Position-Reverse-Polarity-Control-Maintained/dp/B001PNHBW6 The above polarity reversing switch is...
  23. hatzie

    Fuel selector valve

    You have the wrong valve for the wiring you're attempting to use. If you have a feed only, no return line, fuel system then get the Standard Motor Products FV1 valve. If you have a fuel return line you need the 81-91 Pollack motorized valve you have. I'd try to find the wiring out of a...
  24. hatzie

    Timing and Dieseling

    Don't bother with a Fluidamper for a regular smallblock. Wasn't suggesting you should. Just commenting on the engines I've seen this happen on and what I did to fix em. Sorry I wasn't clear about that. The $50-$70 rubber balancers are just fine for a basic smallblock motor. I might consider...
  25. hatzie

    What new tools have you got lately?

    Two nice CDI Inch-pound torque wrenches. 0-30 1/4" & 0-300 3/8". The brag sheets claim 4% ASME B107 calibration tolerance. FWIW CDI is a Snap ON brand. My old cheap 0-75 in-lb beam wrench sprouted legs when my much younger stepbrother borrowed it for an afternoon wrenching session on his...

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