Pistons

Discussion in 'Street/strip 400/430/455' started by Bob Kuna, Sep 17, 2004.

  1. Bob Kuna

    Bob Kuna Active Member

    Hello Everyone
    I seem to remember reading about people having problems running Hypereutectic Aluminum Pistons in there Buick 455's. Can anyone explain to me these problems.
    Thank You
    Bob
     
    Bob Kuna, Sep 17, 2004
    #1
  2. 73-462GS

    73-462GS GS Mike

    Bob- These pistons are sensitive to detonation. They will run fine in a street combo with a mild setup. They will not hold up under any detonation however. I'm running them around 475 Hp 10 to 1 compression with a Poston 113A cam and have had no problems whatsoever. Mike D.
     
    73-462GS, Sep 17, 2004
    #2
  3. LDPosse

    LDPosse Well-Known Member

    I'm running these pistons in my 455 truck motor, 9:1, 220/235 cam, coming up on 4500 miles and no problems yet, I hope I didn't jinx myself by saying that!
     
    LDPosse, Sep 17, 2004
    #3
  4. Bob Kuna

    Bob Kuna Active Member

    The reason I was asking was I just bought a 455 and the person gave me these pistons .040 over along with some more parts and wondered if it was worth using them or just spend the money and buy forged pistons. I want this engine to be very reliable after it's rebuild and hold up to all kinds of abuse. I'm not afraid to spend money on good parts. I would like to build an 11 second engine for my 70 GS.
    Bob
     
    Bob Kuna, Sep 18, 2004
    #4
  5. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    Get the forged pistons, they are much more durable, and better for high performance engines(read 11 second car). Kinda hard to avoid a little detonation over the life of the motor(looking for optimum ignition timing, bad gas etc.) Besides, why bore the motor .040 over, when maybe .030 will do.
     
    LARRY70GS, Sep 18, 2004
    #5
  6. Bob Kuna

    Bob Kuna Active Member

    Thank You Everybody.
    Bob
     
    Bob Kuna, Sep 18, 2004
    #6
  7. staged2ny

    staged2ny Silver Level contributor

    i would definetly go with the forged pistons , you dont want to go through all the work and tme of putting an engine together ,just to have to take it apart when the pistons break. put good stuff in the inside the first time then you can always add other power adders later on ... just my opinion . mike
     
    staged2ny, Sep 18, 2004
    #7
  8. 83regal455

    83regal455 Guest

    i would run the hyper's
    We run a 455 with the poston 110 cam, stage 1 heads, s divider intake, holley 830, poston headers, 9in 4.56's gears, 29.5x10.5x15 hoosiers in a 3370 1989 buick regal body (g body frame).

    The cars ran 11.508 today at 117.86 mph.
    The motor has been race only for 3 years with the hyper's.

    Thanks
    Dustin
     
    83regal455, Sep 19, 2004
    #8
  9. 70purplerag

    70purplerag Silver Level contributor

    Bob If you are looking to sell the pitons in the future let me know. I have a stuck SF block that I know will need at least .30 so .40 would be safe. Thanks and good luck with your build.

    Kevin
     
    70purplerag, Sep 19, 2004
    #9
  10. KELLY SONNABEND

    KELLY SONNABEND Well-Known Member

    i run hypers, no problems, but i run proper gas, and no NOS, if you are running forged or hypers, and are not running proper octane thats abuse.
     
    KELLY SONNABEND, Sep 20, 2004
    #10

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