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Max size in porting TB?

This is a discussion on Max size in porting TB? within the External Engine forums, part of the LSx Technical Help Section category; I want to port and polish my tb for my 2000 ss camaro. I think the stock size is 75mm. ...

  1. #1
    Member SS-Power's Avatar
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    Max size in porting TB?

    I want to port and polish my tb for my 2000 ss camaro. I think the stock size is 75mm. How many mm can i shave off? Any input would be great.

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    Senior Member SeVeReDiStOrTiOn's Avatar
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    Most people port to 78mm...not sure if you can shave off more though.

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    Member SS-Power's Avatar
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    Quote Originally Posted by SeVeReDiStOrTiOn View Post
    Most people port to 78mm...not sure if you can shave off more though.
    ok, thanks

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    Member ApexVIII's Avatar
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    the blade does not get bigger, theres just a ridge around the inside before the blade that is about 2mm
    M6, Lid, Ported and Polished Throttle Body (By Me!), LT, Custom Catted Y, Electric Cutout, PHB, LCA13.21@108 with a 2.3 60'

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    Member jrgswhitels1's Avatar
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    CAREFULL with that ridge!! If your stock, you can complicate idle! Just port all up to the ridge/ feather port your way up there! You can also fill the IAC valve port to promote higher port speed!

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    ls1ftw tigersport14's Avatar
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    what does porting it do?

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    Member jrgswhitels1's Avatar
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    Not good for low speed air velocity, but helps define/envelope more horsepower by increasing volume of air!

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    Member jrgswhitels1's Avatar
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    Porting ridge modifies tuning efforts done by GM whom purposely created it to speed up port velocity to help encourage low speed torque! Ive ported them out and only ran into idle problems with stock LS1's! They do not perform any better either: very sluggish out of the hole. However, they do work well with a cammed -up LS1's!!

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