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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

stock LT1 intake manifold opening

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Old 08-11-2007, 11:18 AM
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Default stock LT1 intake manifold opening
what size are the stock openings on the intake mani, i know the t/b is twin 48 but i have heard the stock intake mani opening is twin 52, can anyone help?
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Old 08-11-2007, 11:24 AM
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Good *** question...
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Old 08-11-2007, 11:29 AM
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52mm from factory.

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Old 08-11-2007, 11:50 AM
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52 is correct I just happen to have stock intake the garage (getting ready to ship it to AI for porting)



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Old 08-11-2007, 12:41 PM
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what about the LT4 manifold ?
Was it the same or bigger?
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Old 08-11-2007, 01:04 PM
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Originally Posted by Raven97
what about the LT4 manifold ?
Was it the same or bigger?
52 mm
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Old 08-11-2007, 02:27 PM
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Yup, stock ports are 52mm, stock TB is only 48.
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