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stock throttle body or after market

This is a discussion on stock throttle body or after market within the External Engine forums, part of the LSx Technical Help Section category; what is the opening of a stock LS1 tb? Would you suggest port and polishing or just buying an aftermarket ...

  1. #1
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    99 trans am convertible

    stock throttle body or after market

    what is the opening of a stock LS1 tb? Would you suggest port and polishing or just buying an aftermarket tb?

  2. #2
    Member 94 Formula's Avatar
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    M3 SMG 350HP

    Quote Originally Posted by mrcarter View Post
    what is the opening of a stock LS1 tb? Would you suggest port and polishing or just buying an aftermarket tb?
    75mm stock.

    I would buy an aftermarket T/B from professional products.

  3. #3
    Member 180ls1's Avatar
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    1998 Firebird Formula WS6

    Quote Originally Posted by mrcarter View Post
    what is the opening of a stock LS1 tb? Would you suggest port and polishing or just buying an aftermarket tb?
    i would port and polist your own first and then if you are not satisfied then you should get an aftermarket one. there is a lot better things to spend $200 on then a throttle body unless you have a cam or heads or something major like that. i assume your car is pretty much stock?

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    member since may 2000 nhraformula's Avatar
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    2000 nhra edition formula

    i would do neither.
    sometimes no gains have been reported after a port and polish. any gains afterwards are always very small.
    2000 nhra edition formula
    a few bolt ons, 379 rwhp
    11.96 @113.25

  5. #5
    Member 180ls1's Avatar
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    1998 Firebird Formula WS6

    Quote Originally Posted by nhraformula View Post
    i would do neither.
    sometimes no gains have been reported after a port and polish. any gains afterwards are always very small.
    i have heard it helps with throttle response so i am going to give it a shot on my car espically because i have a 6 speed

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