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  1. rich weyand

    Edelbrock 1406 failed emissions

    One additional note. The Carter carb (the Edelbrock's origins) was a production carb. The auto manufacturers did not test and tune each engine. They came up with a set of settings that worked for a prototype, and then tuned all of those cars the same on the production line. Same rods, same...
  2. rich weyand

    Edelbrock 1406 failed emissions

    They want the mixture rich across the board for people who don't tune the carb, so they don't burn up their valves and blame the carb. Also, our truck engines have very high vacuum compared to high-compression/high-overlap engines. So they are going to run richer on the same settings. There...
  3. rich weyand

    Edelbrock 1406 failed emissions

    Those are the standard jets and rods, so they are probably the stock 5" springs. The issue with the springs is that these engines pull so much vacuum, you are always in power mode with 5" springs. I stretched the 8" springs by 1/4" to get them to more like 9" springs. The springs should be...
  4. rich weyand

    Edelbrock 1406 failed emissions

    I tuned mine with an AFR meter. Here's the setup I have. It's probably close for you. secondary metering jets: Edelbrock 1426, 0.095" (stock jet) primary metering jets: Edelbrock 1425, 0.092" metering rods: Edelbrock 1461, 0.065" cruise, 0.057" power step-up springs: 8#
  5. rich weyand

    Affordable engine replacement?

    He can also run the stock Chevrolet Performance 10067353 with a dual plane manifold and headers, and not replace the cam, for $1500. That nets 250 hp and 350 lbft. Not quite as beefy a torque curve -- not as high, nor at as low an rpm -- as the 12-235-2 cam, but then he wouldn't void the...
  6. rich weyand

    Affordable engine replacement?

    You'll be happy with it. Lots of torque, pretty nice high end, pretty cheap. Not a ton of lift, so it won't be a short-lifetime deal tearing up the valve train. Your performance will be very dependent on how well tuned you get the carb. I strongly recommend dropping $300 on a good, wideband...
  7. rich weyand

    Affordable engine replacement?

    That's from the Camquest simulator. Yeah, yeah, I know, simulators. But it compares well to the stock setup, which the simulator predicts well. Holley has dual-plane manifolds as well, or you can ask Summit what will work.
  8. rich weyand

    Affordable engine replacement?

    Buy the Chevrolet Performance 10067353 engine at JEGS for $1500 delivered. Put the Comp Cams 12-235-2 cam in it before you even run it. Use the springs and lifters that are already in it. Put a dual plane manifold like Edelbrock 2101 or 2701 on it. 290 hp @4000, 415 lbft @2500.
  9. rich weyand

    rv cam questions

    The Summit SUM-1100 is torquier than the SUM-1101. https://www.summitracing.com/parts/sum-1100 Both of those Summit cams have very slow ramps. The difference between full duration and .050 duration is 76 degrees. What you get with the Comp 12-300-4 is faster ramps, of 48 degrees. Faster...
  10. rich weyand

    rv cam questions

    Ouch. That's a lot of tire diameter for 3.08s. (29/33) * 3.08 = 2.70 effective gear ration. That is, it would be like factory 2.7 gears on factory 29s.
  11. rich weyand

    rv cam questions

    BTW, if you get that cam, and you have 3.73:1 gears, you will need at least a 31x10.5 tire in the back to hook up. With 29" diameter tires, you are going to need something like a 275 or 285 tire, like a 285/60R15, unless you like lighting them up on dry pavement.
  12. rich weyand

    rv cam questions

    RV cam, sometimes called a marine cam. Lots of torque in the bottom of the range, may not wind as tight as a normal cam. Install the Comp Cams 12-300-4. Put in new springs; the stock springs will work if they are new. Put in new lifters; you MUST put new lifters in with a new cam. They bed...
  13. rich weyand

    Square on the Interstate

    Yup. It was supposed to be safer not to let people know how fast they were going. Prior to that, most auto speedometers went to 120, with 60 straight up in the middle. A glance could tell you whether you were going 60, or a bit above, or a bit below.
  14. rich weyand

    Square on the Interstate

    I've done 175 mile shots from Bloomington, IN to Champaign, IL at 75 all the way on the interstate multiple times. Ran 320 miles each way from here to my bro's in IL at 75 all the way on the interstate. Mine's a '78 carbed 350 with TH350 and 3.73 gears. As for mpg, I get 10 in town, 12 at 65...
  15. rich weyand

    How Good is my gas mileage?

    78 Cheyenne 4x4 short bed, new 350 (Edelbrock carb, stump-puller cam, and headers), TH350, 3.73 gears, 31" BFGs -- 10 in town, 12 on the highway at 55, 10 on the highway at 75, with hubs FREE and xfer case in 2WD.
  16. rich weyand

    engine runs like crap when cold

    Let me guess. Someone took the thermac off and it's running an open-element air cleaner.
  17. rich weyand

    350 Engine Build

    Couple things: The 12-231-2 cam with a dual-plane intake manifold and headers will give you 418 lbft @2500 and 285 hp @4000 with everything else stock, including the 882 heads. The Holley is a great racing carb. Street, not so much. Stick with the Qjet and put a rebuild kit in it.
  18. rich weyand

    factory-style tachometer

    The GMSports tach is also spot on accurate. I put it in *and* a fuel gauge on the left, so I could have dual gauges for dual tanks. Note that the GMSports gauge is available in both typefaces, old and new, which I did not know when I got it, so I have the new typeface in my 78, but I like it...
  19. rich weyand

    Adding relays to headlights.

    Except it actually does make the headlights brighter, by getting rid of the voltage losses incurred from running headlight current through all that wiring and connectors. So it does describe the end effect.
  20. rich weyand

    cam

    For a fun street cam for a low-compression 350, look at 12-235-2 or 12-231-2.
  21. rich weyand

    cam

    Download the Camquest software from the Comp Cams site and enter the parameters for the Chevy small block. That's a street/strip cam. 314 hp @ 5000, 375 ft lb @2500. Says cam RPM range is 2400 to 6500 -- from that you would expect to need a 2500 rpm torque converter, but the torque curve...
  22. rich weyand

    cam

    I assume Comp Cams number 12-552-4. Yeah, it'll do OK. 288 hp @ 4000, 407 ftlb @2500. Pretty nice numbers, and the torque comes in low enough to make it a fun driver. Stock torque converter will work fine. Make sure you replace lifters and valve springs with the recommended parts, and...
  23. rich weyand

    K10 5.3 headers

    Oops. Yes, indeed. They fit all SBCs, which I assumed from the 5.3, but if it's an LS, then nope.
  24. rich weyand

    K10 5.3 headers

    Hooker 2453 long-tube headers fit all K squarebodies with no mods.
  25. rich weyand

    Tuning issues

    Too much base timing, too little vacuum advance, too little mechanical advance, and the mechanical comes in too early. Your timing curve is basically all screwed up. The timing curve should be determined by charge density and rpm. Everybody thinks they can come up with something better for...

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