Recent content by dsteelejr

  1. dsteelejr

    1980 Starter wires?

    Thinking about it, the only time I’ve seen a yellow wire going to starter was for points ignition. It was to supply direct battery power to the point system while the engine was cranking. I don’t know why you’d have that on a 1980 unless the original owner ordered the truck with the HEI delete...
  2. dsteelejr

    1980 Starter wires?

    Aside from the heavy AWG battery cable to the starter, there should be a 12 AWG purple wire on the S post of the starter solenoid that is the signal from the key switch to crank the starter. There are two 12 AWG red wires that are attached to the primary power post. One wire goes to the junction...
  3. dsteelejr

    Settling on timing

    Something isn’t adding up. How did you figure TDC?
  4. dsteelejr

    Misfire when hot

    Always start with the basics, the easiest things you can check before tearing everything apart. You said you’re running a Holley 750 race carb, does it have a choke? Is the choke fully open at operating temperature and staying open? If that’s not it then try changing the ignition module and...
  5. dsteelejr

    Wiring

    Here's a crude diagram for how the fuse block gets constant power. Wiring changed slightly over the years so your may differ slightly or if you're using an aftermarket harness. These should all be red wires.
  6. dsteelejr

    Pro Flo 4 with Delphi FE0114 or ACDelco EP381

    What kind of power are you making with your 350? Asking bc I was trying to decide what fuel pump to use. I'm building a mild 412 for an '88 K5 to replace the tired 350 TBI. Just looking around I couldn't find anything else that met the pressure and flow rates PF4 wants. My mild build will...
  7. dsteelejr

    Bolt hole pattern on the front of the heads

    I have an ‘88 K5 that is 100% stock with 276k miles on the original TBI 350. I’m going to be replacing that 350 with a SBC 400 with an Edelbrock top end kit and Pro Flo 4. The Blazer still has working A/C and I want to keep it working after the swap. I have a set of Edelbrock 5089 heads, which...
  8. dsteelejr

    Fuel gauge troubleshooting

    I’ve never heard of an output test either, but in the spirit of checking everything I tested it and would’ve expected 12V in, 12V out. I checked the terminal on the plug that plugs into the switch and it’s getting the same 8.5V I measured at the prong on the gauge going to the sending unit. I’m...
  9. dsteelejr

    Fuel gauge troubleshooting

    1973 C20 with factory dual tanks. The truck has been in my family since ‘84 and most everything is factory or stock. The wiring is not modified or hacked up. The fuel gauge worked fine for both tanks until one day the needle started pointing to the 3 o’ clock position for both tanks. I am aware...
  10. dsteelejr

    What is this? Asking for a friend

    Not sure what transmission he had, but I’ll bet you’re right, it’s probably for cruise control and possibly lock up torque converter
  11. dsteelejr

    What is this? Asking for a friend

    Orange for the power feed into the switch and white for the switched power to active the brakes lights
  12. dsteelejr

    What is this? Asking for a friend

    I don’t think the truck did. It’s a ‘78 and as far as I know cruise came out in the 81+ years, correct me if I’m wrong. But the column was out of an ‘86 and may have been in a truck with cruise.
  13. dsteelejr

    What is this? Asking for a friend

    My buddy has a ‘78 that’s been Frankensteined by POs. Hes doing a steering column swap and asked me what this is. My guess is a brake light switch, but wires are wrong color. Any ideas?
  14. dsteelejr

    What does these green and blue wires go to

    Reverse lights
  15. dsteelejr

    New engine installed - need TBI timing/idle help

    This is on my ‘88 K5 with a 350. Everything is 100% stock and unmodified. The brown wire is near the bulkhead connector. Hope this helps.
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