Generation IV Internal Engine 2005-2014 LS2 | LS3 | LS7 | L92 | LS9

what motor size

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Old Feb 22, 2014 | 10:58 AM
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I am a few weeks away on pulling the trigger on a new motor . Now here is my problem ,
What size do I go with . this is my problem . Supercharged 408 , or na 427 or na 440 . I have 15 grand to do it and the t56 just needs rebuilt . The car will be driven a few time a week and taken to the track . I am looken for 650 at the wheel . Now if it makes more who to complain ! More hp the better , just no lower then 625 650 and still stay in my price range .
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Old Feb 22, 2014 | 12:13 PM
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Why not a supercharged LS3. That way you can still get good gas milage and obtain you goals. That is a lot of power to the rear wheels. For street car you will need to find a way to get the power to the ground.
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Old Feb 22, 2014 | 06:38 PM
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Originally Posted by 1989GTA
Why not a supercharged LS3. That way you can still get good gas milage and obtain you goals. That is a lot of power to the rear wheels. For street car you will need to find a way to get the power to the ground.
650 RWHP is about 730 hp +/- at the flywheel . . . The LS3 block might not "like" that ( at least not on a "long-term" basis ) and the iron LQ9 block should handle it easily. Plus, NOTHING in the LS3 is FORGED . . . With forced induction, non-forged internals might be a "gamble"!

I'd say an all-forged LQ9 408 would get the job done, with a 4" stroke, and also avoid the problems encountered with 4.100" / 4.125", or longer, stroke.

I sure hope he isn't still running the 10-Bolt rear !

Last edited by ez2cdave; Feb 22, 2014 at 06:43 PM.
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