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ford ln600 dump truck

Discussion in 'Ford Trucks' started by ibuildcars4u, Feb 24, 2006.

  1. ibuildcars4u

    ibuildcars4u Junior Member
    from ohio
    Messages: 18

    i have a 1973 ford Ln600 dump truck with [what i believe is] a 330 or 340 small block original hd truck motor. [ i will edit the post when i look at the truck for the correct size motor] it has the 5 speed with 1st being the granny gear, and a 2 speed rear end. what motors are interchangeable with this truck and trans, the motor is blown, someone told me that you HAVE to replace it with a hd truck motor, the original size if possible. my question is why [as long as the trans bolts up to it] couldn't i put a 360 or 390 big block light truck motor in it, or if a big block will not bolt up, then a 351 ford? i found a used [ millage unknown] original replacement motor for it for $1200. now i know i can get a 351, 360, 390 for at or under $500, but i was told you cant put a car/ light truck motor in it, any advice would be greatly appreciated, any suggestions? thank you for your time, i will post the correct motor later on today, thanks
  2. Jpocket

    Jpocket Senior Member
    Messages: 302

    A car motot will fit, but the Truck motors internals are different. A truck motor will have a longer stroke for more lon end torque. the truck motor is going to make it's power from an idle up to about 4,000rpms. A car motors power band may be up to 6,500rpms. Also the truck motor. will use more durable parts, like forged cranks, and high volume oil pumps. The cam is going to be differnt set up for low end pulling power. If you do put the car motor in there it's gonna work ALOT harder and will not last as long, your gonna have to "wind it up" more to get the heavy loads moving better. And you'll end up using that Granny gear alot more to compensate for the loss of torque. It should work fine if you are just doing local stuff, hauling topsoil, and mulch or whatever, but I wouldn't have any intentions of working this truck real hard if you putting the car motor in, it would ust be a bad set up.
  3. ibuildcars4u

    ibuildcars4u Junior Member
    from ohio
    Messages: 18

    thanks for the info, i was using a car motor as example of motors classified with trucks/cars. i would look for a 360 or 390 big block out of at least a 3/4 to 1 ton truck, but i do understand that it will not be as strong but with going to a heavy duty pickup truck motor it should be in the middle of the motor i have now, and a car motor, thanks again for your time and info
  4. MickiRig1

    MickiRig1 PlowSite Veteran
    Messages: 3,617

    Did you try Adelmans? Canton OH
    Light duty:330-452-9329 Heavy duty: 330-456-0206
    They have a huge amount of truck parts and big truck plow mounts.
    They have saved me major dollars.