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  1. iflyfisher

    Light white smoke and backfire at high RPM or under load

    I am losing my head(s)!! I finally got to checking the compression this morning. I took the truck out for a short run to warm it up then pulled the plugs. This is the first time I had pulled the plugs since putting a bit of time on the engine. I pulled 1, 3, and 5 and each of the plugs had a...
  2. iflyfisher

    Thank you post to y'all.

    I've been relying heavily on the folks on this forum as well to get my Dad's old '73 running again. Like you, I'm learning a ton.
  3. iflyfisher

    Light white smoke and backfire at high RPM or under load

    Gents, we are getting very close. Swapped out the points and condenser this morning. I tried doing this with the distributor in, but very difficult to get in there. The condenser screw was totally blind, so I decided to pull the distributor. I thought I had noted where the cap was, so putting...
  4. iflyfisher

    Light white smoke and backfire at high RPM or under load

    Thanks for all the quick feedback. Got a good list of things to tackle tomorrow. @squaredeal91, I do have an old dwell meter of my dad’s. I did some reading on setting up a dwell meter and adjusting dwell. Think I can tackle it. I downloaded the manual on the forum for the truck. When looking...
  5. iflyfisher

    Light white smoke and backfire at high RPM or under load

    @squaredeal91, I had a few recommendations to swap the distributor for an HEI setup, but frankly I want to learn to tinker with the points one for now. I did floss the points a bit with some 400g paper when I had the distributor out. But you are correct, I haven’t checked the dwell setting...
  6. iflyfisher

    Light white smoke and backfire at high RPM or under load

    @Grit dog, Thanks! I love that color scheme too. It will look much nicer in a couple of years when it doesn't have the rust accents :). @DoubleDingo, The exhaust seems dirty, and makes a mess of my garage floor. I put up a cardboard box to protect the stucco wall. Sounds like some gunk is...
  7. iflyfisher

    Light white smoke and backfire at high RPM or under load

    Quick update. All the valves are functioning fine. I turned each of the rods, and all turned fine, so they should be straight. No excess slop around the rockers. I also put the timing light back on and checked the advance when I blipped the throttle. The timing mark advanced as the RPMs...
  8. iflyfisher

    Light white smoke and backfire at high RPM or under load

    @Snoots, thanks for the diagram. I am going to chase down a vacuum gauge and take some readings. I might pick up some fresh vacuum line and replace the old stuff. The truck still has the original Quadrajet. I think it is a 4MV. Where do I hook the vacuum gauge for manifold vacuum? In looking...
  9. iflyfisher

    Light white smoke and backfire at high RPM or under load

    Just read the linked article. Dang, lots of good info in there. I’ll try and work through some of the tests. Definitely going to save that one. Thanks for digging it up.
  10. iflyfisher

    Light white smoke and backfire at high RPM or under load

    @Ricko1966, thanks for the clarification. I did notice when putting the carb back on, the vacuum hose connection going to the carb from the vacuum advance was very hard and stiff. I’ll get a vacuum gauge and check. I’m not clear on how I can be in the cab driving, doing a power brake, and being...
  11. iflyfisher

    Light white smoke and backfire at high RPM or under load

    @rusted nuts, I'll do some more digging. Wish I knew more. @PrairieDrifter, Good advice. I will check the valves and compression over the next day or two and let you know what I find. The truck was purchased by my Dad new back in 1973. He was fanatical about oil changes and other general...
  12. iflyfisher

    Light white smoke and backfire at high RPM or under load

    Getting a ‘73 K20 running that had been parked since 2005. I rebuilt the carb, replaced the plugs and ignition wires, checked the points and condenser, and have the timing set for 4 BTDC. I also changed the oil, drained the old fuel, and ran fresh gas through the pump to push out any old gas...
  13. iflyfisher

    K20 Wheel/Tire Confirmation

    Thanks @Shorty81, @Craig 85, @bucket. That is exactly what I needed! I agree, Craig, I wouldn't want my wheels and tires tucked any more under the well. I had hoped to go with the US Wheel as they are already powder coated. I'll have some added cost with the Vintiques to powder coat but looks...
  14. iflyfisher

    K20 Wheel/Tire Confirmation

    Hey Folks, I am a bit concerned whether 285/75 R16 would fit on my stock K20 using the US Wheel 16x8 wheel with +19MM of offset and backspace of 5.25". I likely won't run tires much wider, so I could mount them on the US Wheel 16x7.5, which has +13MM of offset and 4.5" of backspace. This latter...
  15. iflyfisher

    K20 Wheel/Tire Confirmation

    Indeed. But getting wheels and good tires on will be a good start. Based on research, I think 285/75’s will fit my truck. I’m a little concerned as the 8” version of the rims has +19mm of offset and 5.25” of back space.
  16. iflyfisher

    K20 Wheel/Tire Confirmation

    After days of searching, I have given up on using the 16.5 wheels. I didn't like any of the tires I found that would remotely work with the wheel and my truck. I still want a white steel wheel, so I will likely go with a U.S. Wheel OE (Series 664) or similar in a 16x8. That wheel will give me...
  17. iflyfisher

    K20 Wheel/Tire Confirmation

    Thanks @bucket. Seems like every decision re this truck takes so much time to research. Great to have the internet and resources so available :)
  18. iflyfisher

    Retrofitting a 79-87 bed on a 73

    @bluex, Thanks for responding. I found a fairly clean bed from a later gen square body. My 73 has dual tanks, so I'd also have to deal with adding a fuel door to the other side. I was thinking later last night and this morning that perhaps I should just weld in the patches for my existing bed...
  19. iflyfisher

    K20 Wheel/Tire Confirmation

    Thanks @bucket, Are you running a set of the 12x16.5's you linked in response to my original post on your C20? Frankly, I am not that concerned about running a bias ply tire. The truck might get 3-5k miles per year, mostly kicking around. I'm not going to be on the freeway putting 20k on in a...
  20. iflyfisher

    Retrofitting a 79-87 bed on a 73

    Hi Folks, I am starting work on my Dad’s 73 K20 Fleetside. The bed is in pretty rough shape and am mulling options. Rust is typical but not terrible. I could cut out and replace the worst sections. But I’d still be left with an inner bed banged up from years of hauling wood. I don’t think I...
  21. iflyfisher

    K20 Wheel/Tire Confirmation

    @Craig 85 - thanks for the pics and info regarding the lift. I’ll probably end up doing the lift. I have a Sierra 1500 AT4 that has a 2” lift and really like it. @bucket - not quite sure what you are confirming. I’m guessing the question regarding a 32” diameter and 12” width, not the 33”...
  22. iflyfisher

    K20 Wheel/Tire Confirmation

    Thanks @1x1_Speed_Craig. You have me wondering more about what size tire I can work with. If I were to go 12x16.5 as @bucket notes these wheels were designed for, that extra width may cut into my clearance. Does anyone know if 32” will clear with 12” tires? I have found a few 33” options, but...
  23. iflyfisher

    K20 Wheel/Tire Confirmation

    @Travir, I was hoping to avoid dropping $2-$3K on wheels and tires before the truck has been restored as I'm not sure what I want now, which also may be different than what I'd want after the truck has been restored. So the thought was getting something cheap but workable for the time being...
  24. iflyfisher

    K20 Wheel/Tire Confirmation

    Thanks Strick, Craig, and 75GMCK25. A local guy has a set of aluminum 16s with 265/75’s Ling Long ATs that have about 50% life remaining. Not a fan of the tires. The wheels are okay. But, they would be temporary, and I can probably get them for a few hundred. They would get me on the road.
  25. iflyfisher

    K20 Wheel/Tire Confirmation

    Hi Folks, I am getting my Dad's '73 K20 Custom back on road. I'll be doing some restoration, but I would also like to drive the truck while working on it. The old Sears tires are heavily cracked. I can't even imagine how old they are. The truck was last registered in 2005. The tires are 9.5 -...

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