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  1. #21
    Join Date
    Jul 2006
    Location
    Northwestern NJ
    Posts
    354
    Quote Originally Posted by Fuelie Fan
    Why does everyone keep saying that the big block will make more torque? If they have same displacement and can accommodate the same cylinder pressures, they should be capable of equivalent torque. Heck, it has 475 ft-lbs STOCK and lingenfelter gets them to a reliable 575. Plus, you'd never have to worry about cold or off-idle stumble with EFI. I understand the look and aura arguments, and they do have validity, but from a performance standpoint, what am I missing?
    They may have equivalent torque peaks, but they make them at different places on the curve. The LS7 has a bigger stroke and a smaller bore than the Mark IV 427. You can spin the daylights out of a good Mark IV, plus that new ZL1 block has a lot of room to bore. The LS7 may make more torque at a lower rpm for street manners, but GM says 7000 rpm is the max you should turn it. At least a stocker. The Mark IV will really pull on the top. Depending on what cam, heads & bottom end he uses, he can see and easy 8000 rpm. IMO, the Mark IV has more potential in this situation just because I think he may make more power for the same or less money unless he put a power adder on the LS7.

    Tommy


    Tommy Souren

    "The older I get, the faster I was."

    Grandma's 20k mile '80 Malibu Classic, in-progress factory style LS6 454, Legend LGT 700 5 speed, 9" 3.70 posi, Global West suspension, 12"/11" discs.

  2. #22
    Join Date
    Aug 2004
    Posts
    133
    I really appreciate all of the help guys. I have decided to keep the BBC 427 and put a big single on it to make it a bit more unique.

  3. #23
    Join Date
    Jun 2010
    Location
    Deployed
    Posts
    3,122
    Country Flag: United States
    Quote Originally Posted by Yenko boy View Post
    I really appreciate all of the help guys. I have decided to keep the BBC 427 and put a big single on it to make it a bit more unique.

    So what came of this?

    1970 Camaro/DSE build


    Are you driver enough? Maybe....come on blue!
    https://www.pro-touring.com/threads/...71#post1147371


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