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Throttle Body On 98 Z

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Old 03-18-2007, 10:43 AM
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Question Throttle Body On 98 Z
What Is The Size Of A Stock Throttle Body On A Stock 98 Z28? Are There Any Benefits To Going To A Little Bit Larger Body?
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Old 03-18-2007, 11:45 AM
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78mm. Larger throttle body is useless without an intake manifold with a larger opening. Refer to the External Engine forum for more information.
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Old 03-18-2007, 03:18 PM
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Unless it is a 93' to 95' of which you cannot port them nor need to. 93' & 94' have no MAF so the size can vary - double check the year if that is the case.
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Old 03-20-2007, 08:16 PM
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Originally Posted by DuronClocker
78mm.
A stock throttle body is listed as a 75mm. The lip in front of the blade (which you remove while porting) actually only makes it around a 72.5mm throttle body.

Originally Posted by DuronClocker
Larger throttle body is useless without an intake manifold with a larger opening. Refer to the External Engine forum for more information.


https://ls1tech.com/forums/generation-iii-external-engine-6/
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Old 03-20-2007, 09:36 PM
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Originally Posted by GEARHED
Unless it is a 93' to 95' of which you cannot port them nor need to. 93' & 94' have no MAF so the size can vary - double check the year if that is the case.
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