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Thread: horse power estimate

  1. #1
    Senior Member EXPERT BUILDER
    Join Date
    Nov 2008

    horse power estimate

    its in an 83 chevy longbed

    bottom end
    2 bolt main 350 bored 40 over
    eagle cast stroker crank 3.75 stroke
    gm preformance rods
    keith black claimer flat top pistons

    top end
    vortec heads 62 cc chamber
    comp roller rockers
    voodoo 489, 491 cam
    highrise dual plane and a 750 holley

    compression is 11.2-1

  2. #2
    Senior Member RACING JUNKIE
    Join Date
    Mar 2003


    Hope this HELPS?
    G 8)

  3. #3
    Senior Member EXPERT BUILDER
    Join Date
    Nov 2008
    i run that before the vortec heads
    i had stock 194s with a 9.5 comp

  4. #4
    Senior Member EXPERT BUILDER
    Join Date
    Aug 2007
    Orient, OH
    I have to agree with G. The vortec heads are better than stock 70's heads, but its not much.

    Back in the day I had a Firebird with a 355 flat top motor, .488 / .510 cam, Weiand dual plane intake, 750 dp. It ran 9.0's in the 1/8 with 4.10 gears, powerglide tranny with 3200 stall converter. I switched to the vortec heads and it only ran a best of 8.93. I thought they would help it a bunch, but it was less than 20 hp I would guess.

    That sounds like plenty of motor to have some fun with in your truck. My old 355 ended up in my 67 pickup. It does some good burnouts, but I have never taken it to the track.
    Josh VanHorne

    1964 Chevy Nova
    Worlds quickest and fastest tow truck. (9.92 @ 137)

  5. #5
    Senior Member EXPERT BUILDER
    Join Date
    Nov 2008
    they arent just stock vortecs
    ive ported them and done a 3 angle valve job and had them milled from 64cc to 62cc
    i dont know if that really makes a hole lot of defference though

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