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  1. rich weyand

    High Idle Issue

    Base timing is always measured/set with the vacuum advance disconnected. People say to plug it off but you don't need to just to set where the sparky goes. So you have base timing 16* BTDC, mechanical advance 20*, vacuum advance 15*. This will give 31* BTDC at idle, 16* BTDC at low rpm with...
  2. rich weyand

    High Idle Issue

    The stock distributor setup (20 degrees mechanical and 15 vacuum advance (the can will say 7.5 -- that's camshaft degrees, it's 15 crankshaft degrees)) is fine. That would give you 16 degrees BTDC as base timing. I just set mine at 16 degrees and went over to the nearby steep hill, stopped on...
  3. rich weyand

    High Idle Issue

    Ah, I answered the earlier post, and now see that you posted that GM engineer's write-up. He is exactly correct. Mine is just the short version. ;-)
  4. rich weyand

    High Idle Issue

    Here it is in a nutshell. The part that increases advance as the rpms increase is the mechanical advance. It makes up for the fact that the charge burn time is in milliseconds, but the timing is set by degrees. As the rpms increase, the number of milliseconds that corresponds to a given...
  5. rich weyand

    Engine build

    Let's do something easy first. Check your base timing. If it's in the upper teens, back it off several degrees and see if the rattle goes away.
  6. rich weyand

    High Idle Issue

    Not quite. Manifold vacuum is just that, it is the actual vacuum in the engine manifold, and it is the best determinant of how much advance you need for the engine to run best. Ported vacuum came in in 1968 and is part of the pollution nonsense. The idea was to fire the spark late (no vacuum...
  7. rich weyand

    High Idle Issue

    ^^^ This.
  8. rich weyand

    High Idle Issue

    Let me guess. You have an open element air cleaner, your vacuum advance is connected to ported vacuum, and your base timing is set to about 4* BTDC. Right?
  9. rich weyand

    1977 Rough Idle Stalling Elderbrock Carb..

    A periodic maintenance item on the Edelbrock is to pull the mixture rods and step-up pistons and clean off the pistons and the cylinders they live in. They get dirty, then they stick in the up position. Use a q-tip with solvent or gasoline to clean the cylinders.
  10. rich weyand

    Buying New Carb

    A normally aspirated 454 at 5000 rpm and volumetric efficiency of 1.0 (which you won't get), pumps 656 cfm. T'were me, I'd get a 750 Qjet.
  11. rich weyand

    mild 350 build

    Unless you stay out of it a bit. Oh, wait, you said you were just getting out of high school. Never mind. :) Gonna need a TH400 or a built TH350, or mod the one you have before you blow it up. The 12-bolt will be OK, unless it has the G80 in it and you plant it making a right turn into...
  12. rich weyand

    Thermostatic air cleaner repair

    Post pix.
  13. rich weyand

    Oil, Filters, and Changes

    ZDDP is a wear reducer. Not having it in there will result in somewhat faster wear during normal engine operation than if you had it in there. Is your engine going to blow up in 20,000 miles without it? No. Will your lifter bottoms, cam lobes, pushrods, lifter sockets, and rocker sockets...
  14. rich weyand

    Oil, Filters, and Changes

    My opinion: Zinc and phosphate additives are not just for break-in. Sufficient ZDDP levels should be maintained. ZDDP under high pressure deposits a protective coating on wiping surfaces like cam lobes and lifter bottoms. It then wears off, but it has been chemically changed during this...
  15. rich weyand

    High torque starter?

    Which carb?
  16. rich weyand

    Another Gauge Cluster Question or 3

    ^^^ x2
  17. rich weyand

    Another Gauge Cluster Question or 3

    If he has no resistor, I would use a spare bulb in the lead. Any bulb. All the bulbs in our trucks are low enough resistance to run a temp gauge up to HOT.
  18. rich weyand

    Another Gauge Cluster Question or 3

    Yes, of course, if you know it is the gauge wire. But in checking to see if a wire IS the gauge wire, a bit of discretion is in order, and can't hurt.
  19. rich weyand

    Another Gauge Cluster Question or 3

    I would run the wire to ground through a 150 ohm resistor. If the gauge moves up to the middle of the range or so, that's the right wire. If it's the wrong wire, 150 ohms will keep you from shorting out whatever else it connects to.
  20. rich weyand

    Another Gauge Cluster Question or 3

    No need to drain the fluid when you replace them Have it standing by with some teflon paste on the threads. Back the other one out until it is just holding on, then hold the new one in your right hand while backing out the old one with your left. When the old one comes free, just thread the...
  21. rich weyand

    Another Gauge Cluster Question or 3

    And this is in the 78, right? Because the connector on the end of the green wire is the "clip on sideways to a pin" type used through 1978, and the later sending units had a 1/4" spade connector (like most of the rest of the wiring) as used from 1979 on. You can use that thread I pointed to...
  22. rich weyand

    Another Gauge Cluster Question or 3

    A correction here. There were two resistance curves used on our trucks for temp gauges. Up to 78 it was one gauge curve and sender, 79 on it was different. See the thread I pointed to just above.
  23. rich weyand

    Another Gauge Cluster Question or 3

    The correct sending unit depends on year, in particular the year of the gauge. It is the gauge and the sending unit that have to match -- they have to agree on "how many ohms equals how many degrees" -- so it depends on what year is the cluster you swapped in. Here's a thread on another...
  24. rich weyand

    mild 350 build

    When I was growing up in the late 1960s, the most popular girl was the daughter of the guy who owned the chrome shop....
  25. rich weyand

    mild 350 build

    Oh, you will, because it's not just the engine. It's also the carb, the intake manifold, the headers, the exhaust system, gaskets, etcetcetc. Figure another grand before it's over, maybe 1500. As for exhaust, 2.25 duals is plenty for any naturally aspirated 350 to 5000 rpm. The only time...

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