Thread: Which Mod to do First

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  1. #1 Re: Which Mod to do First 
    Bastard Reptile's Avatar
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    Just some friendly advice here. Unless you're very mechanically confident with these engines, I would steer away from tearing into the bottom end. It's extremely difficult to build one back up without spinning a bearing. The bolts are all TTY, and you have to be very exact with your tightening.

    Now, that said....if you want to swap out a SC engine, that would be the easiest. If you still want to top swap an engine, and plan on getting a NA engine to do it, get one from the newer GP's, they have the stronger powdered metal rods that will hold up a little better to the abuse. It's a fine line to walk on a NA engine, but you can make good power with them with a larger pulley. It takes much more horsepower to run a 3.0 than it does a 3.8.

    Just my 2 cents.
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  2. #2 Re: Which Mod to do First 
    GrandPrix Junkie Sabrewings's Avatar
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    Quote Originally Posted by Reptile View Post
    If you still want to top swap an engine, and plan on getting a NA engine to do it, get one from the newer GP's, they have the stronger powdered metal rods that will hold up a little better to the abuse.
    Exactly why I'm going to top swap mine. I have a hybrid Series II/III. In 04 when GM introduced the Series III, it became the basis for all 3800s in the subsequent model years. So, for Impalas in 04 and 05 which still used the Series IIs, they got a Series III block, bottom end, and heads. Only differences are the UIM/SC, fuel rails, TB, and electronics. Otherwise I already have a Series III in Series II clothing.
    2004 Impala LS - got some mods sold!!!
    2009 Subaru Impreza WRX STI

    NAIOA moderator Still Imp'n, just in a different Imp.
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  3. #3 Re: Which Mod to do First 
    GT Level Member johnnyj773's Avatar
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    Quote Originally Posted by Reptile View Post
    Just some friendly advice here. Unless you're very mechanically confident with these engines, I would steer away from tearing into the bottom end. It's extremely difficult to build one back up without spinning a bearing. The bolts are all TTY, and you have to be very exact with your tightening.

    Now, that said....if you want to swap out a SC engine, that would be the easiest. If you still want to top swap an engine, and plan on getting a NA engine to do it, get one from the newer GP's, they have the stronger powdered metal rods that will hold up a little better to the abuse. It's a fine line to walk on a NA engine, but you can make good power with them with a larger pulley. It takes much more horsepower to run a 3.0 than it does a 3.8.

    Just my 2 cents.
    what do u mean a larger s'charger pulley?
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  4. #4 Re: Which Mod to do First 
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    If you do a top swap the pistons from the NA lower end have a higher compression, you get more power from a pulley size but means if you have no mods you should start with a 4" pulley rather than a 3.8. The higher compression requires a slightly larger pulley as opposed to the lower compression L67/L32 version.
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