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ls3 into a 97 Vette

 
Old 04-25-2019, 12:10 PM
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Default ls3 into a 97 Vette

Hi I an about to start the install of a LS3 into a 97 Vette. I have done a lot of checking and the only thing I am a little confused about: some sat I have to change the intake out some don't. Do I need to change the intake
I am using the LS1 coputer with a conversion box
thanks

Last edited by MPETERS; 04-25-2019 at 12:14 PM. Reason: trying to typ with one hand due t oeratin
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Old 04-25-2019, 12:51 PM
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I have 97 vette fuel rails on a L76 intake for my return-style fuel system in my 94 firebird - not sure how comparable that is to LS3 (IIRC they're virtually the same) but I can't imagine it's much different?
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Old 04-30-2019, 08:40 AM
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If I recall correctly you will have to get an extention for the MAP sensor since it moves from the back of the manifold to the front. Also the MAP sensors are different from the LS1 to the LS3. Some say to adapt the LS! MAp and some say to tune the PCM for the LS3 one. I will be putting an LS3 into a 4th gen Monte SS using a LS1 PCM and will just be adpating the LS1 MAP. Oh and you will have to get an adapter to use the 3 bolt throttle body onn the LS3 4 bolt manifold.
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Old 04-30-2019, 05:52 PM
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Hi
Thank you for the help. I am ordering parts now. hope to start the install started in about 3 weeks, have the LS1 out
Mike
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Old 05-01-2019, 11:47 AM
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I'm putting an LS3 intake in my 2000 Formula. So far, I know about the MAP issue mentioned (I'm using an LS3 MAP and also needed to buy an extension w/ conversion, also tune changes) and a throttle cable bracket. There also is a vacuum connection (for a/c) in the back of the LS1 style manifold (at least on the f-bodies) that is not on the back of the LS3 manifold. Don't know how I will fix this.
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Old 05-15-2019, 04:17 PM
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Hi
I am now looking at looks street headers. On the kooks web page they day their street headers must be used with there x-pipe. Does anyone here know why. Is anyone running them without tha kooks x-pipe. I understand the concept of the x-pipe.
Thanks
Mike
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Old 05-16-2019, 12:51 PM
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I have a 99 C5 with a LS3 Headed Engine, ARH LTs & X Fit Excellent.
Just another data point if you haven't purchased yet.
Good Luck
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