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Thread: Dart shp short block- street recommendation?

  1. #1
    Junior Member JOURNEYMAN
    Join Date
    Jan 2005
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    26

    Dart shp short block- street recommendation?

    Looking for advice for a Dart SHP-based 400 short block. Will be used on street in a 57 Belair hardtop. Local shop said stay away from 434/427 with this block, stay with 415 or 421 motor. Overheating should not be problem: have Griffin aluminum crossflow with dual electric fans and temp switch. Beefed 700R4 and 9" with 3.50 posi. 770 Holley Street Avenger on Motown single plane. Cam is Comp Cam middle Thumpr, 235/240 @ .050, 522/509 lift hydraulic roller. Power band peak under 6000. Looking for torque, top end not that critical. Which way to go? Thanks. Mep

  2. #2
    Senior Member RACING JUNKIE
    Join Date
    May 2006
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    2,044
    Actually the 415 or 421 will be plenty enough for the street, I'd shy away from anything bigger than that for street use.
    ***IN GOD WE TRUST***

  3. #3
    Junior Member JOURNEYMAN
    Join Date
    Jan 2005
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    26

    SHP SHORT BLOCK

    Thanks. I'll probably go with the 421. Mep

  4. #4
    Senior Member RACING JUNKIE
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    The only difference i see, is that i would go with a duel plane manifold, the single plane manifolds tend to be flat below 3,000 rpm and don't produce as much torque in the lower rpm range. the 421 will be plenty for a street engine.

    JMO

    Zip.

  5. #5
    Junior Member JOURNEYMAN
    Join Date
    Jan 2005
    Posts
    26

    400 sbc

    Thanks, Zip. I was previously running this intake on the street on my 355 with 10.5 comp. It actually ran very well down low, although I suspect you are right in that a dual plane makes more torque down low. The intake and heads are already port-matched so I will probably stay with the combo. Thanks again. Mep

  6. #6
    Senior Member RACING JUNKIE
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    Dec 2008
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    Sugar Hill, GA
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    Quote Originally Posted by zipper06
    The only difference i see, is that i would go with a duel plane manifold, the single plane manifolds tend to be flat below 3,000 rpm and don't produce as much torque in the lower rpm range. the 421 will be plenty for a street engine.

    JMO

    Zip.
    x2, heavy car needs the dual plane.
    Dave


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