383 stroker dyno results

Discussion in 'High Performance Modifications' started by 1974blackz28, Aug 12, 2017.

  1. 1974blackz28

    1974blackz28 Member

    91
    0
    Jan 29, 2010
    Detroit
    Hello all just thought I would share my dyno results for my 383, wondering what you guys think... it seemed a bit low for me but IDK what a typical value is.

    Its a 383 stroker

    6 inch rods

    10.5:1

    Comp 270 cam (12-211-2) with .470 in lift on int and exh

    1.6 roller rockers

    edelbrock 7501 air gap intake

    trickflow 23 degree heads

    Summit long tubes

    Holley 750 with vacuum secondaries, completely stock.

    Its backed by a th400 and 3.73 gears.

    Made 302HP @5400RPM and 320 lbft @3980RPM the graph is [​IMG]here http://imgur.com/a/7gl2J
     

    Attached Files:

  2. CasperCasper

    CasperCasper Veteran Member

    947
    84
    Aug 11, 2015
    Are those whp numbers? They are SAE corrected and pushing through an auto I'd say thats about right. SAE numbers are always significantly slower. My friends c10 did 330 SAE at the wheels through a turbo 400 and runs 12.20 all day long, don't let numbers scare you, every dyno is different!
     
  3. xten

    xten Veteran Member

    785
    275
    Sep 24, 2014
    Pittsburgh, Pa.
    We call the chassis dyno "The Dream Crusher"!
     
  4. 1974blackz28

    1974blackz28 Member

    91
    0
    Jan 29, 2010
    Detroit
    They are chassis dyno numbers so I'm assuming thats whp. So what do you guys estimate st the crank?
     
  5. CasperCasper

    CasperCasper Veteran Member

    947
    84
    Aug 11, 2015
    360ish at the crank. If you did this with std corrected numbers itd show you 350ish wheel and 400+ crank. Take it to the track and get a mph then you will know your true hp
     
  6. 1974blackz28

    1974blackz28 Member

    91
    0
    Jan 29, 2010
    Detroit
    I'll have to take it there.

    I thought a motor with these specs should make at least 450 hp. What's wrong here ?
     
  7. 79RedZ

    79RedZ Veteran Member

    585
    17
    Mar 24, 2009
    Hamilton,MI
    Hopefully others will chime in but that cam seems kind of small to get you to 450 hp goal.
     
  8. 73 Z

    73 Z Veteran Member Gold Member

    724
    2
    Jun 9, 2007
    Los Angeles, Ca
    fattening up the carb jetting primaries from 72 stock to 76+ should help a little
     
  9. larrylarry

    larrylarry Veteran Member

    1,304
    39
    Dec 22, 2011
    San Antonio Tx
    TH400 transmissions are know for 2 things, being strong & using up horse power befor it gets to the rear wheels but all autos do that, some worse than others. TH400 being worse than most.
     
  10. 1974blackz28

    1974blackz28 Member

    91
    0
    Jan 29, 2010
    Detroit
    Thanks for the input guys. I'm thinking about swapping the cam to something hotter, any recommendations? The car has power steering, AC (Sanden Comp) and power brakes.
     

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