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Thread: pros and cons of 350 or 400 mains in blown alky sbc

  1. #1

    pros and cons of 350 or 400 mains in blown alky sbc

    which would be a better choice for blown alcohol small block chevy and why?

  2. #2
    Junior Member JOURNEYMAN
    Join Date
    Dec 2002
    Location
    kNOXVILLE,TN.
    Posts
    26
    400 mains because the crank would be stronger because of overlap on rod and mains

  3. #3
    Senior Member MASTER BUILDER
    Join Date
    Dec 2005
    Location
    Rutherfordton North Carolina
    Posts
    192
    As Terry said 400 mains would be the only way to go.we have built several blown and turbo small blocks one turbo sb2.2 making 2230 H.P.
    at that power level you need to have a crank made with .187 radius on all the journals in order to keep it from cracking.with the blower you will also need a crank with a big block snout and dual key ways. Bill
    Hendrens Racing Engines
    1310 U.S. Hwy 221 North
    Rutherfordton N.C. 28139
    828-286-0780 Bill, Steve, Mike
    www.hendrensracingengines.com

  4. #4
    Administrator RACING JUNKIE bjuice's Avatar
    Join Date
    Apr 2003
    Location
    Greenville s.c.
    Posts
    3,239
    also do not forget the crank hub......harmonic balancers are a BIG NO-NO.

    Brian
    Bjuice..

    "I'M YOUR HUCKLEBERRY ! "

  5. #5
    Senior Member MASTER BUILDER
    Join Date
    Mar 2007
    Location
    mich
    Posts
    208
    i agree with bill on the crank radius and the duel key ways big block snout. i wont start anything on the 400 or 350 mains. good luck with the build


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