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1986 crew cab 350

Discussion in 'Engine & Performance' started by Zach86, Jun 3, 2020.

  1. Zach86

    Zach86 Junior Member

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    Joined:
    Jun 3, 2020
    Location:
    Columbus Ohio
    First Name:
    Zach
    Truck Year:
    1986
    Truck Model:
    C20
    Engine Size:
    350
    I have a 1986 crew cab short bed with the following modifications. It’s a 350 I put summit vortex heads on it with scorpion 1.5 roller rockers, retrofitted comp cams roller lifters, a crane roller cam .488 intake & .509 exhaust, edelbrock 2116 intake, edelbrock 1406 carb, a huggers GM5Xtm torque converter on a th400, with a 4:10 rear end. MSD coil, MSD box, MSD wires. My truck starts up and runs fine but if I punch it from a dead stop it won’t spin the tire, posi is my next add on. Once it’s rolling around 40mph it will run strong when I floor it. But it’s a dog below that. Any suggestions?
     
  2. EvilGenius

    EvilGenius Full Access Member

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    Joined:
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    Location:
    Metro Detroit
    First Name:
    Darien
    Truck Year:
    1985
    Truck Model:
    K10
    Engine Size:
    305
    Accelerator pump on the carb? When you punch the peddle it should squirt some fuel down the primaries to remove any 'lag' in the system. Timing could also be off.
     
    Paladin likes this.
  3. Bextreme04

    Bextreme04 Full Access Member

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    Joined:
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    Location:
    Salem, OR
    First Name:
    Eric
    Truck Year:
    1980
    Truck Model:
    K25
    Engine Size:
    350-4bbl
    sounds like you need to dial in your timing and carb. I would bet your A/F ratio is off and your timing curve is probably not right. That motor sounds like it should have plenty of power to spin a one-legger.
     
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  4. sirweesarunch

    sirweesarunch Junior Member

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    Location:
    Oceanside
    First Name:
    John
    Truck Year:
    1980
    Truck Model:
    K30
    Engine Size:
    454
    More than likely the wrong cam for bottom end torque. Go to comp cams and you can punch in all the parameters and get best torque possible cam recomendation. Cams are the Red Light District of engine parts.


    Sent from my iPhone using Tapatalk
     
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  5. BigDaddy72

    BigDaddy72 Full Access Member

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    Joined:
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    Location:
    Bentonville Arkansas
    First Name:
    Travis
    Truck Year:
    1974
    Truck Model:
    C30 Chassis Cab
    Engine Size:
    496
    What duration is listed with that cam? If you have the cam card list the specs.

    As already mentioned that cam sounds too big.

    That being said. What is your timing set at?

    Without knowing the duration that cam probably needs initial timing at 12-14* and 32-38* total.

    That cam more than likely won’t start making power below 3,000 rpm

    Also what is your stall speed on the conv and what size tires?
     
    Last edited: Aug 15, 2020
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