new hybrid LS/SBC

Discussion in 'High Performance Modifications' started by $ Mike 70 Z-28, Jul 29, 2019.

  1. $ Mike 70 Z-28

    $ Mike 70 Z-28 Veteran Member

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  2. 76z28

    76z28 Veteran Member

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    The ls doesn't really have any benefits when after market sbc heads are involved.
    The ls has a better block.... And weighs less. Not many reasons for this build at all.
     
  3. Twisted_Metal

    Twisted_Metal Administrator Staff Member Lifetime Gold Member

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    It uses LS heads.
    Look at the exhaust ports.;)

    641 hp & 555 lbs torque are pretty decent numbers with a carb, distributor and no forced induction on this oddity.
     
  4. 1980RS

    1980RS Veteran Member

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    So it uses LS based heads and a special block to make 641hp. I made 602hp with my 406 SBC back in the 90's with nothing special in that engine.
     
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  5. $ Mike 70 Z-28

    $ Mike 70 Z-28 Veteran Member

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  6. dave@ztech

    dave@ztech Veteran Member Lifetime Gold Member

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    Combines the best of both, and fits and works without a computer, sweet!!
     
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  7. John Wright

    John Wright Veteran Member Lifetime Gold Member

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    The Motown SBC block is a tough block, but the cam and valley cover are something that is unique to this combination due to the LS lifter spacing.
     
  8. newschool72

    newschool72 Veteran Member

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    This isn't new. Motown put this combo together about 15yrs ago. The idea originally was to make it easier to " swap" . It came out when there wasn't 100 different kits on the net to bolt an LS in a classic. They also claimed the SBC had less crank windage and was worth 20ish hp over a similar build with an LS block. Downside in my mind to the Motown is the cost and exotic nature of their block. Lots cheaper to pluck a new block from a wrecked Silverado than order a new one from Motown.
    I have an old article around here somewhere that showed a test Motown did with 3 427cid engines they make that are similar, build wise . An SBC, LS, and the hybrid. The SBC was least powerful, the LS made about 50 more hp than the SBC, then the hybrid made about 20 more HP than the LS.
    I will stick with my LS variants. Hard to beat, bang for the buck.
     
  9. Lowend

    Lowend Administrator. .a car, a man, a maraca. Staff Member Lifetime Gold Member

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    I'm not aware of any aspects of the LSx that are inferior to the Gen 1 SBC.
    It's lighter, stronger, has better oiling...
    Not sure what anyone would want this
     
  10. badazz81z28

    badazz81z28 Veteran Member

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    I saw this probably 3 or so years ago, maybe longer. I agree not much to offer here...of course SBC parts are cheaper and all the old school features but get the new cylinder head technology. The block alone probably doesn’t give you any cost savings, but I can see some marketable appeal.
     

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