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Does 391whp seem low?

This is a discussion on Does 391whp seem low? within the Camaro / SS forums, part of the Vehicle Specific category; I just recently finished an LS2 swap in my 98 Z28. Its an LS2 block bored .020 over (almost a ...

  1. #1
    Junior Member
    Join Date
    Nov 2008

    1998 Camaro Z28

    Does 391whp seem low?

    I just recently finished an LS2 swap in my 98 Z28. Its an LS2 block bored .020 over (almost a 6.1) with factory oversize pistons, a 227/233 .585/.585 cam, lightly ported/polished 243 heads and an LS6 intake. I still have a stock throttle body and crank pulley. The car is an automatic, so obviously i am losing a decent amount of power through the trans, but i was expecting somewhere around 420 or 430. Was that too optimistic of me?

  2. #2
    Member Sayed_000's Avatar
    Join Date
    Oct 2008
    Middle East - Bahrain

    Camaro 2000 SS M6

    391whp is a huge power but with that ls2 you should gain more power ..

    my ls1 with full bolton's and gears + cam

    have 375whp on wheels !
    Paceseter LT's | QTP 3" e-cutout | custom 3" ORY pipe | Magnaflow 3" cat-back |Thunder Racing 230/236 112+2LSA custom Cam | MTI carbon fiber lid | K&N Fillter | LS6 intake | ls2 ported oil pump |Slp short shifter | m6 w/4.10s ratio | monster stage4 clutch | Hurst shifter | Dyno Tuned !

  3. #3
    Visualize°Design°Create SSwt00SS's Avatar
    Join Date
    Dec 2005
    Dallas, TX

    '12 Silver SS 1SS
    '00 Black SS #8617

    every car is different, and yes being an auto (stall?) it robs more power that an M6. from personal experience, ditch the Ls6/stock TB, and get yourself a Fast, port the SOB and get an U/D pulley. also, since you lightly worked the engine over (bore/heads), it's not like you're going to see a HUGE increase in power. in some regards, yes, i believe you were expecting too much.

    did you mill the heads? what's your C/R? the LSA on the cam? is the cam a custom grind? what about the tune? you dont mention anything about exhaust? what other bolt-ons are done to the car? whats the duty cycle of the injectors?

    there are a lot of factors that you need to look into with the setup and no doubt you will find the answers and areas in which you need to address to get the results you desire. good luck!
    2000 SS - The Wicked Witch: °°Cammed 'n Slammed°° 458rwhp/410rwtq
    Quote Originally Posted by Bowtie_girl30
    I was hoping to just hump her up the exhaust cause she is so damn sexy....
    "Never argue with an idiot. They drag you down to their level, then beat you with experience."

  4. #4
    Junior Member
    Join Date
    May 2008
    1999 Z28

    Was the converter locked or unlocked when you dynoed? I think a ported FAST intake will do you some good too. Who did the tune?

  5. #5
    Senior Member
    Join Date
    Mar 2009

    Arctic White, red/gray
    1997 Corvette, 92 Typhoon

    391whp are good numbers, your cam isnt a huge one and you could gain more power with a better intake manifold. For cam only auto car with ported stock heads its not bad.

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