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  1. rich weyand

    Really hot after shut off?

    The core of the engine (pistons, bores) is hot when running, and that heat is conducting away through the water jacket, which is being circulated through the radiator. So in the steady state while running, the engine core is much hotter than the water jacket. When you shut the engine off, that...
  2. rich weyand

    best way to improve fuel economy

    No, I agree, a new properly tuned Qjet will get a little better mileage than a properly tuned Edelbrock. My recommendation is to talk to Sean Murphy over at SMI carburetors. That'll set him back 400, and maybe perform best with a new intake manifold, depending on what he has on their now...
  3. rich weyand

    best way to improve fuel economy

    Carb to TBI will help, and no it isn't worth it, dollarwise. Your Edelbrock is running rich as a cob. They're setup that way right out of the box so you don't lean-kill the engine if you don't bother to tune it, which most people don't. I have 350/TH350, 31" BFGs (not known for gas mileage)...
  4. rich weyand

    Camshaft Basics

    This is good for people who would rather read than listen/watch: http://www.crankshaftcoalition.com/wiki/How_to_choose_a_camshaft
  5. rich weyand

    Cam

    Again, a high-rise manifold is intended for high rpm horsepower, and will reduce low-end torque. Just go with the 2701 like MadOgre says. firebane: 12-300-4 is what I have, as you know. Maximum torque at lowest rpm and stock lift for long-term reliability of the drivetrain. I love it. I did...
  6. rich weyand

    Cam

    Yup. A loping idle means the engine isn't set up to run at low rpm, but at high rpm. That's a great setup for a track vehicle, but not for a street vehicle, especially a truck. Probably the best all around cam for a street vehicle in the low-compression 350s is the Comp Cams 12-230-2. Do not...
  7. rich weyand

    Coolant Temp Sensor Question

    OK, that's what I thought. I didn't want the OP to think that having the cap off during the swap was what you meant. We're good.
  8. rich weyand

    Coolant Temp Sensor Question

    Do NOT replace the sensor with the cap off! The coolant will run out like crazy! Instead of a small glug-glug-glug, it will pour out. Once the sensor has been replaced, idle the engine for a bit with the cap off to help cycle the air out. MO, I think that's what you meant, but I want to...
  9. rich weyand

    Look at what I scored! :)

    These guys have a lot of stuff on CD. http://www.detroitironis.com/General_Motors_CD_s.html I got the 73-78 parts manual. They are pdfs. Getting hard to find, though.
  10. rich weyand

    Coolant Temp Sensor Question

    Yup, that's how I did it. 1) engine off, truck cold, pressure relieved by opening the cap, then put the cap back on and seal it so no air can get in the other end. that's what slows down the coolant from leaking out. 2) put liquid teflon pipe sealer on the threads of the new sensor. you...
  11. 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...
  12. 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...
  13. 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. ;-)
  14. 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...
  15. 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.
  16. 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...
  17. rich weyand

    High Idle Issue

    ^^^ This.
  18. 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?
  19. 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.
  20. 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.
  21. 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...
  22. rich weyand

    Thermostatic air cleaner repair

    Post pix.
  23. 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...
  24. 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...
  25. rich weyand

    High torque starter?

    Which carb?

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