496 BBC Dyno results
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496 BBC Dyno results

  1. #1
    GTO's and Jets Punisher's Avatar
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    Default 496 BBC Dyno results

    My old 454 with RV cam and 8:1 compression was getting really tired and using a 2 quarts of oil every trip to the lake so I decided to freshen it up this winter. I took it out and when dissassembled it was determined it needed a new crank because the old crank was already turned .030 and it needed a bore so I checked into costs and decided to put a 4.250 stroke crank in it with a nice Speed Pro Hyper piston on the stock "Truck" rods with good bolts. I also found a nice set of 781 heads to rebuild for it. For a cam we used a Crane L-88 flat solid grind with 264/269 @.050 duration and 112 Lobe Separation. Induction is a Weiand tunnel ram with 2 650 Edelbrock AVS carbs. Compression turned out at 9.75:1 with the piston .005 out of the hole and the heads had no port work at all and retain the stock valves. We set the timing on 32 degrees total and used 91 octane pump fuel and 2 1/4" tube headers and we ran a manual water pump on it for the dyno.

    This engine is for my 77 Taylor SJ with Berkely pump.

    Any guesses as to what this budget 496 made for HP and where the peak was?

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    Senior Member tigertooth's Avatar
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    570@5900 Built an engine sim iliar a few years ago. made 587@ 5900. Had a little more compression than yours.

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    Senior Member Widetrack's Avatar
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    I will give you a little more than Tiger 604 HP 5900 RPM


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    21' Liberator Jet NORDIC454's Avatar
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    600@6000

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    gn7
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    How come Nordic 454 is the only one of you that can post a HP without creating a bogus E-mail link?


    Hopefully, it won't make so much the OP wishes he had never chosen those pistons.
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    21' Liberator Jet NORDIC454's Avatar
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    Quote Originally Posted by gn7 View Post
    How come Nordic 454 is the only one of you that can post a HP without creating a bogus E-mail link?


    Hopefully, it won't make so much the OP wishes he had never chosen those pistons.
    What is your estimate??

  10. #9
    gn7
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    Quote Originally Posted by NORDIC454 View Post
    What is your estimate??
    before it fails a piston skirt?

    read this and you'll realize to never make guessitamations of engines you didn't assemble. I love playing Clue. But in the game of Clue, you have way more "clues" and evidence to go on.
    LINK: dyno test

    Heres what a single 4 bbl oval port pump gas 496 can make. I think the OP will be a little shy of this.
    Last edited by gn7; 01-04-2012 at 05:47 PM.
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    GTO's and Jets Punisher's Avatar
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    Widetrack was closest so far...

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    Dang that turned out small...It was 606 HP @ 5300 RPM with 619 ft lbs of @ 5000. Stock 781 heads, factory L88 cam, 9.75:1, 496 ci, Tunnel Ram, 650 Edelbrocks, low RPM lake boat... just a cruiser and tube puller...

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    GTO's and Jets Punisher's Avatar
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    GN7 - that dyno sheet looks much like the one from my 463 CI Pontiac engine in my 69 GTO... High points of that one were 709 HP @ 6100 and 680 Torque at 5400...

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    What Dyno?
    If For Some Reason I Do Something Worthy Of Recognition. God Provided The Ability And Deserves The Credit.


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    Quote Originally Posted by Infomaniac View Post
    What Dyno?
    Stuska - gotta be really close because my GTO at 3525 lbs runs 9.90's at 136 with the 709 HP and 680 torque...


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