K5 Blazer engine options???

Discussion in 'Trucks and Trailers' started by South Florida Lawns, Mar 12, 2010.

  1. South Florida Lawns

    South Florida Lawns LawnSite Platinum Member
    from usa
    Messages: 4,784

    I recently got an 87' k5 for $400 Its got the big mud tires and all that, straight mud truck that goes on a trailer.

    It needs a new engine. I was thinking a 383 stroker motor but my friend said go with the 434. I could drop another 350 in there but I want more power!!!!!!

    What do ya'll think? 1 ton running gear is also in the works too.
  2. KrayzKajun

    KrayzKajun LawnSite Fanatic
    Messages: 10,737

    go with a 454 out of an old mid 70-80s truck! tons of torque!!!!
  3. hosejockey2002

    hosejockey2002 LawnSite Bronze Member
    Messages: 1,195

    Since it's a mud toy and not a trailer puller, I'd go for a built small block that will rev up high and spin those mudders fast! The 383 stroker would be a good way to go. If you have lots of money to spend swap in a modded and chipped 6.0 Vortec out of a newer truck.
  4. Gravel Rat

    Gravel Rat LawnSite Fanatic
    Messages: 9,544

    I would say a 383 that way you can keep the stock radiator what year is this thing ?

    Trying to find a 350 with a 4 bolt main might be hard to find the hot rod guys are buying them up.
  5. evanbrendel

    evanbrendel LawnSite Member
    Messages: 87

    fuel injection for sure love the 6.0s
  6. evanbrendel

    evanbrendel LawnSite Member
    Messages: 87

    if your going to build it anyways might as well go with aftermarket 4 bolt splayed caps.
  7. Gravel Rat

    Gravel Rat LawnSite Fanatic
    Messages: 9,544

    I'am not a GM man so I don't follow the new things to build a hot rod engine.
  8. Junior M

    Junior M LawnSite Fanatic
    Messages: 13,584

    4bolt mains are pretty common down here, course so are old Chevys. :cool2:

    I'd personally go for a real torquey(sp?) motor. The 454 is my personal favorite, but the 383 is great motor to.

    The 400 small block(6.0) is an AWESOME MOTOR, will flat out get up and go with great torque imo. But be ready to drop some change on just a motor.
  9. Gravel Rat

    Gravel Rat LawnSite Fanatic
    Messages: 9,544

    The 350 chevy engines don't last long in junk yards they are bought up by the hot rod crowd. Even engine rebuilders have troubles getting 350 engines for rebuildable cores.

    For a K5 Blazer a 383 would be good power and as I said you would keep the stock rad etc. If you wanted a power engine buy a 502 crate engine drop it in :laugh:
  10. Cooter

    Cooter LawnSite Senior Member
    from NE Iowa
    Messages: 510

    Go with the 383. The 434 would be very expensive. You can build a 6" rod 383 for relatively cheap. No need for splayedcaps unless over 500hp. A set of Dart heads or a set of Vortec heads. Both would make good power. Get it balanced and turn it 7000rpms. Anyways, wheres the pics.

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