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  1. rich weyand

    Lackluster Power

    When the paper pops out, you know that that is the compression stroke. But the paper doesn't magically pop at TDC. Here's another way. TDC on Number 1 for any Chevy V8 is when the keyway on the crankshaft pulley is at 45*; that is, between 1 and 2 o'clock when viewed straight on from the...
  2. rich weyand

    No start

    Did you do ANYTHING else when you rebuilt the carb?
  3. rich weyand

    Lackluster Power

    Sounds more like the timing tab is in the wrong location.
  4. rich weyand

    Lackluster Power

    Total timing is initial plus mechanical. Initial is what you see at idle with the vacuum disconnected. Total timing is what you see at 3000 rpm with the vacuum disconnected. Mechanical advance is the difference, which for stock HEI is 20*. The distributor should be stabbed so that at 0*...
  5. rich weyand

    Lackluster Power

    Total timing does not mean what you see at idle plus what you see at 3000. Total timing is what you see at 3000 with the vacuum advance unhooked. That is, it is base timing plus mechanical advance. What you ought to see is something like 14-16 at idle, and 34-36 at 3000. You are about 10...
  6. rich weyand

    engine running funny

    I'll differ a bit. The general consensus is that SBCs do best with 34-36 degrees of total timing. With a 20* stock mechanical advance HEI, most people would say your best timing is 14-16 BTDC. Generally speaking, more advance is better, right to the detonation limit. All the old school hot...
  7. rich weyand

    I have a stupid question about valve covers

    Then use these gaskets. Rubber with a steel core so they won't shift. http://www.jegs.com/i/JEGS+Performance+Products/555/21100/10002/-1 And seal them with this. Clean both mating surfaces with lacquer thinner, then rub it in to both sides of the gasket and both mating surfaces, leaving a...
  8. rich weyand

    Wont start, but has power

    The ground from the head to the firewall needs to be there. The truck really has three electrically isolated parts: the engine, the frame, and the cab. They are electrically isolated because the engine and the cab are both mounted to the frame with rubber mounts. So that ground has to be...
  9. rich weyand

    High idle when slow driving

    Throttle return spring too weak?
  10. rich weyand

    Jetting help

    A vacuum gauge is good for setting the idle mixture. It won't help with the cruise and power circuits, but if you copy my tune you should be real close on those. Then use the vacuum gauge to set the idle mixture. Also, the pop-up springs should be half of the idle vacuum, so for example if...
  11. rich weyand

    h4 7" round headlight kit need help.

    Yeah, since both headlights always do the same thing, the signals from either one are enough to run a relay kit.
  12. rich weyand

    best bolt on performance mods

    It's definitely the way to go. I was surprised by how far off I was, and how much difference it made to be dialed in to the numbers.
  13. rich weyand

    best bolt on performance mods

    Nope, you got it. The sensors have a finite lifetime, so you pull them and cork the bung. You can tune up any vehicle with a bung you can mount the sensor in. Use a high-heat copper anti-seize compound on the thread so the sensor or the cork don't rust in place. And the bung has to be on the...
  14. rich weyand

    best bolt on performance mods

    I'll tell you what I did. First, I got a wideband meter (I got the NGK) that was not a "bolt it into the dash" kind of thing, but something I could hook up and set on the dash while I drove and tuned for a couple weeks, then take off once I was set. Once you have it set up, it is pretty much a...
  15. rich weyand

    best bolt on performance mods

    Yeah, a muffler shop will braze a bung into the exhaust pipe behind the header flange (with headers), or after the manifold flange for a manifold, for $20 or so. They have to do that with all the systems they replace on EFI cars anyway, so this is not a new thing for them. They should also...
  16. rich weyand

    engine running funny

    See if you can go in with somebody. Once you are set up, you don't need it any more unless you make substantive induction or exhaust changes.
  17. rich weyand

    Jetting help

    You're too far away or we could work on it here. Try the tune I posted above. Maybe $40 in parts. It should be real close. May have to change the rods a bit, but that tune was spot on for several different 350 SBC setups I went through.
  18. rich weyand

    engine running funny

    Get an A/FR meter.
  19. rich weyand

    whats a good header to buy for my stock 85 K20

    Hooker #2453 for the K. Hard to get an X-pipe on a K though. I went with an H-pipe right under the tailcone of the transfer case.
  20. rich weyand

    Engine break in

    Boy, do I know that story. "And how much is THAT going to cost?"
  21. rich weyand

    Engine break in

    That's exactly correct, and that's why there is no break-in period to speak of any more. Back in the day, though, there was a recommended period for new cars of avoiding constant speeds, not high-revving the engine, no WOT, etc. for the first few hundred miles. With roller cams and...
  22. rich weyand

    what carb to use?

    If I was getting a new carb, I would get a Qjet from SMI Carburetors. Between the Holley and the Edelbrock, for street use I would go with the Edelbrock. BTW, I have the tuning parameters (jets, rods, springs) for an Edelbrock 1406 on that engine.
  23. rich weyand

    engine running funny

    Not if the fuel pressure is within their operating range, which, for mechanical fuel pumps, is usually true.
  24. rich weyand

    Taillights not working!

    You underestimate how screwy the electrics can get without a cab ground. Until you install that, you have no clue what you really have going on. Also, check for those tail light housing grounds. Headlights too, while you're at it. One sheet metal ground on each side. That is, on your '83...
  25. rich weyand

    83 K10 Cold Idle issues

    That's a good point, so let's elaborate. A carbureted engine with an automatic choke (as opposed to a cable/manual choke) needs the throttle pedal depressed all the way to the floor once, then released, to allow the choke linkage to reset before starting.

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