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Which Rotating Kit?

This is a discussion on Which Rotating Kit? within the Internal Engine forums, part of the LSx Technical Help Section category; Ok so I know this is mostley ls1 stuff but I figure I would ask here to see what kit ...

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    Senior Member JaycenK's Avatar
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    Which Rotating Kit?

    Ok so I know this is mostley ls1 stuff but I figure I would ask here to see what kit people prefer.
    I bought a spare LT1 motor and it turns out the Crank and the rods are shot from motor running on no oil psi. My modest build of a 355 with heads and cam is in question because I need a crank and rods so why not just do a stroker right?
    I looked around before and saw that you can get some rotating asembleys in 350, 383 and 396. I think I want to go with is a 383 but not sure I realy need forged parts because I'm not going to do any spray, or boost. I'm looking at getting 400 to 450 at the rear wheels through an A4. The trans is built to handle 500 flywheel.
    So question is should I go forged and pay the piper now or just go cast? I don't want to spend a lot on the bottom end but what brand is my better choice? or do I just peice a kit together my self? I have heard people curse eagle and others praise them so what is your take on bottom end parts?

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    What I do? SHines-IT's Avatar
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    IDK much about engines, am learning my self. But my stepdad had an LT1 in his 97 Trans AM, I know it was stroked but also think it was bored. I know it was a 383 and had an LT4 Cam, with all kinda other shit. That car was fun, but not a good daily driver. But I would go with an LT4 Cam... IDK if this helps, IDK much about engines...

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    Senior Member JaycenK's Avatar
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    Cam is more specific to heads and type of asperation. I am going to be going with a proven setup for that but I'm realy looking for is input on crank, rods, and pistons. Thanks though.

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    I never had problems with eagle or scat. You're looking at building an engine that is going to be making about 500 horse at the crank I wouldn't go cast anything unless you're not going to run it hard and why go for 500 horsepower if you're not going to run it hard. It's rpm that kills stuff. If it was my engine I would get a whole forged setup. 5148 rods could be substituted for 4340 rods, but I wouldn't skimp much past that. Both scat and eagle make reasonably priced rotating assemblies.

    Check out what professional builders are putting in their 480 to 500 horse engines and keep in mind a builder will usualy put the minimum he can get away with. The guy who builds an engine himself will put the most he can afford.

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    Senior Member JaycenK's Avatar
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    Quote Originally Posted by azfrc View Post
    I never had problems with eagle or scat. You're looking at building an engine that is going to be making about 500 horse at the crank I wouldn't go cast anything unless you're not going to run it hard and why go for 500 horsepower if you're not going to run it hard. It's rpm that kills stuff. If it was my engine I would get a whole forged setup. 5148 rods could be substituted for 4340 rods, but I wouldn't skimp much past that. Both scat and eagle make reasonably priced rotating assemblies.

    Check out what professional builders are putting in their 480 to 500 horse engines and keep in mind a builder will usualy put the minimum he can get away with. The guy who builds an engine himself will put the most he can afford.
    very true about the builders and yea I only figured 500 because of the stroke and before I was looking at doing a 355 so cool thanks for the input.

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