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Question for you out there that have run a 292 in a truck

Discussion in 'Engine & Performance' started by DoubleDingo, Aug 9, 2019.

  1. waterpirate

    waterpirate Member

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    Location:
    delaware
    First Name:
    Eric
    Truck Year:
    1987
    Truck Model:
    k20
    Engine Size:
    350
    I stuffed a 292 into my m37. A popular conversion prior to the perkins 4BT option. It was unstoppable. In 4 low 1st gear you could get out and walk faster than the truck went.
    Eric
     
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  2. DoubleDingo

    DoubleDingo Vacuum Leaks, The Root Of All Evil

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    First Name:
    Shane
    Truck Year:
    1981, 1965
    Truck Model:
    81-C20 Silverado Camper Special-TH400-4.10s; 65-C20 with 4:57 gears and Borg Warner Overdrive
    Engine Size:
    Carb'ed Vortec 350; 1972 L48 350
    Curious why they get loud with dual threes, as opposed to single 6. I can see going dual three into single six. I'm talking cylinders, not pipe diameter. Going that route I could leave some of my existing 2.5 inch exhaust in place and have him run dual 2 inch into it.

    I've never heard a dual exhaust inline 6, but I've read it's a distinct sound. May have to check out YouTube to see if there's any videos on it.
     
  3. DoubleDingo

    DoubleDingo Vacuum Leaks, The Root Of All Evil

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    First Name:
    Shane
    Truck Year:
    1981, 1965
    Truck Model:
    81-C20 Silverado Camper Special-TH400-4.10s; 65-C20 with 4:57 gears and Borg Warner Overdrive
    Engine Size:
    Carb'ed Vortec 350; 1972 L48 350
    Just watched a few videos of various 292 exhaust sounds. The duals sound mean. Raspy. I bet with the right setup it could sound good but not be too loud.
     
  4. legopnuematic

    legopnuematic Supporting Member Supporting Member

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    First Name:
    Spencer
    Truck Year:
    1976, 1979
    Truck Model:
    C10 Cheyenne, C10 Big Ten
    Engine Size:
    350 c.i., 350 c.i.
    I believe it is because of the firing order, on a Chevy six the front most cylinder is #1 and the rearmost is #6, going up in order, the firing order is 1-5-3-6-2-4 so when split up in 2 headers there is no cylinders that share a header that fire back to back, whereas with a common header/manifold there is always a pulse from the last fired cylinder, I'm sure the cam overlap has some part into it too with the lack of scavenging to muffle it or something

    Sent from my Moto Z (2) using Tapatalk
     
  5. Snoots

    Snoots Supporting Member Supporting Member

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    First Name:
    Roger
    Truck Year:
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    Truck Model:
    Jimmy Sierra
    Engine Size:
    350
    My grandfather had one of those and it was one tough beast for many, many years! Not bad on gas either.
     
  6. Rusty Nail

    Rusty Nail Whatever! Supporting Member

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    Engine Size:
    350, 350

    You mean the master cylinder is in the way of the carburetor? Lol? :)
     
  7. DoubleDingo

    DoubleDingo Vacuum Leaks, The Root Of All Evil

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    First Name:
    Shane
    Truck Year:
    1981, 1965
    Truck Model:
    81-C20 Silverado Camper Special-TH400-4.10s; 65-C20 with 4:57 gears and Borg Warner Overdrive
    Engine Size:
    Carb'ed Vortec 350; 1972 L48 350
    So ideally, a Doug Thorley tri-y style header would be best. Although, like you said, take the front 3/rear 3 dual into a single for better scavenging effect, that may be easier. I plan on doing the lump upgrade, HEI, and dual exhaust into single at the very least. The lump upgrade alone increases the torque a lot over stock. And that's why I got this engine, to have torque.

    I also want an Offenhauser intake to run dual carbs, or an intake to run a q-jet. Simple upgrades that make the engine more efficient.

    Going through my '63 shop manual right now, and these engines really appear to be easy to work on.

    Compression is supposed to be 130. If that is all within 20 psi on each cylinder I may just check the main bearings and rod bearings, reseal it and run it.

    Adjusting the valves is similar to the small block with hydraulic lifters, where you find zero lash and turn 1 turn past zero lash.
     
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  8. DoubleDingo

    DoubleDingo Vacuum Leaks, The Root Of All Evil

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    First Name:
    Shane
    Truck Year:
    1981, 1965
    Truck Model:
    81-C20 Silverado Camper Special-TH400-4.10s; 65-C20 with 4:57 gears and Borg Warner Overdrive
    Engine Size:
    Carb'ed Vortec 350; 1972 L48 350
    I got some oil over the weekend and a new filter so I can get some fresh oil in it prior to turning it over. These engine's use the same filter as the 350. The spark plugs need a 13/16" socket.
     
    Last edited: Sep 3, 2019
  9. DoubleDingo

    DoubleDingo Vacuum Leaks, The Root Of All Evil

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    Truck Year:
    1981, 1965
    Truck Model:
    81-C20 Silverado Camper Special-TH400-4.10s; 65-C20 with 4:57 gears and Borg Warner Overdrive
    Engine Size:
    Carb'ed Vortec 350; 1972 L48 350
    Does this look about right?

    2019-09-03 10.19.40.jpg
     
  10. DoubleDingo

    DoubleDingo Vacuum Leaks, The Root Of All Evil

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    Joined:
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    First Name:
    Shane
    Truck Year:
    1981, 1965
    Truck Model:
    81-C20 Silverado Camper Special-TH400-4.10s; 65-C20 with 4:57 gears and Borg Warner Overdrive
    Engine Size:
    Carb'ed Vortec 350; 1972 L48 350

    Never mind, I got my answer. The way it is shown will work to turn over the engine on a stand.
     

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