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Throttle Body sizes

This is a discussion on Throttle Body sizes within the General Help forums, part of the LSx Technical Help Section category; What are the throttle body size differences between: LS1 Z06 Fast...

  1. #1
    Junior Member Robert_Ayala's Avatar
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    Onyx Black
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    Throttle Body sizes

    What are the throttle body size differences between:

    LS1
    Z06
    Fast

  2. #2
    Senior Member greatwhiteZ28's Avatar
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    ls1 is a 75 mm, can be ported to 78mm, fast comes in 78, 90mm, and im not sure on the zo6?

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    Member Sam-SS's Avatar
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    Quote Originally Posted by greatwhiteZ28 View Post
    ls1 is a 75 mm, can be ported to 78mm, fast comes in 78, 90mm, and im not sure on the zo6?
    Do you by any chance know who ports the stock throttle body to 78mm?

    ...>>Sam

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    Member Sam-SS's Avatar
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    Quote Originally Posted by greatwhiteZ28 View Post
    I could not find anything referring to boring to 78mm on
    their web page. I will contact them tomorrow.

    Thankx,

    ...>>Sam

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    Never Drink and Derive Tonik's Avatar
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    Quote Originally Posted by Sam-SS View Post
    I could not find anything referring to boring to 78mm on
    their web page. I will contact them tomorrow.

    Thankx,

    ...>>Sam

    http://www.neweraperformanceparts.com/default.asp?S=503&A=E&PKV=tbportcf|0


    I'm helpful.

  7. #7
    Member Sam-SS's Avatar
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    Red
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    Thanks much but I had seen this one. There is no reference to it being bored to 78mm. Thus, I have to assume that it is stock bore size but smoothed out and polished.

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    Senior Member greatwhiteZ28's Avatar
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    Quote Originally Posted by Sam-SS View Post
    Thanks much but I had seen this one. There is no reference to it being bored to 78mm. Thus, I have to assume that it is stock bore size but smoothed out and polished.
    i know they dont really say much. but after emailing the owner they pasicifically told me thats the limit for stockers. thats the biggest bore a stock ls1 can go with out going to thin

  9. #9
    Senior Member greatwhiteZ28's Avatar
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    here is the best motor builder here in motown also

    http://www.katechengines.com/street_...tail.php?id=12

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    Member Sam-SS's Avatar
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    Quote Originally Posted by greatwhiteZ28 View Post
    i know they dont really say much. but after emailing the owner they pasicifically told me thats the limit for stockers. thats the biggest bore a stock ls1 can go with out going to thin

    In the mean time I came across a place that claims to bore stock TBs to 78mm on eBay. Check this out.

    http://cgi.ebay.com/ebaymotors/ws/eB...167733472&rd=1

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    Senior Member greatwhiteZ28's Avatar
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    or try this, im going this way bc its only 180$ and is 80mm or 85mm

    http://www.professional-products.com/throttleLS1.php

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    The corvette guy John L does em for under 100.00

  13. #13
    Senior Member greatwhiteZ28's Avatar
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    is that in lansing

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    Member Sam-SS's Avatar
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    Quote Originally Posted by 1flynDO View Post
    The corvette guy John L does em for under 100.00
    Yah, I bought a high performance 454 BB from him
    years ago. It blew up three times and I had to trailer
    it from Maryland to Indiana twice and shipped it once.
    I finally dumped it.

    BTW, John passed away several years back.

  15. #15
    Member Sam-SS's Avatar
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    Quote Originally Posted by greatwhiteZ28 View Post
    is that in lansing
    If you are asking about Lingenfelter's place, if I remember
    correctly, it was in a small town west of Indianapolis, IN.

    Had a place there that had wonderful breakfasts. Got to
    chat with all of the farmers and super food.

  16. #16
    Member Sam-SS's Avatar
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    Quote Originally Posted by greatwhiteZ28 View Post
    or try this, im going this way bc its only 180$ and is 80mm or 85mm

    http://www.professional-products.com/throttleLS1.php
    Boy, they just keep popping up. I sent an eMail to this one asking whether they have the later long throttle arm or the earlier shorter arm. I like the shorter arm best. I will post what I find out.

    BTW, in case anyone wants to switch from one to the other, they
    have different cables required for each of them.

    ...>>Sam

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    You are correct John Lingenfelters does a great job for 95.00 with a 2-3 day turn around. I was very happy with the product. You can look at the web site. I wish we had someone decent in Lansing who could work on LS1's. Gotta go to D to get it at W2W or Livernois

  18. #18
    Senior Member greatwhiteZ28's Avatar
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    Quote Originally Posted by Sam-SS View Post
    Boy, they just keep popping up. I sent an eMail to this one asking whether they have the later long throttle arm or the earlier shorter arm. I like the shorter arm best. I will post what I find out.

    BTW, in case anyone wants to switch from one to the other, they
    have different cables required for each of them.

    ...>>Sam
    neverheard about lenghts on the tb arms, whats the diff??

    and do they include the cabels since you say there different.??

    +++ would i have to buy additional stuff for this TB to install this
    ?

  19. #19
    Member Sam-SS's Avatar
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    Quote Originally Posted by greatwhiteZ28 View Post
    neverheard about lenghts on the tb arms, whats the diff??

    and do they include the cabels since you say there different.??

    +++ would i have to buy additional stuff for this TB to install this
    ?
    The 98/99 arm is shorter than the later ones. I found this out when I purchased a ported 2002 TB on eBay
    and found that the throttle would not close to idle. The
    fix was to buy the later cable which was about $33 at
    the dealer. I prefer the shorter, earlier arm as my
    car is stick and it just seems much more responsive.
    I dono how the two arms would work with an automatic.

    Ok, now on the 80mm unit that you had come up with
    I had eMailed them and got a response. Their units
    come with both arms and can be changed back and
    forth, of course one must have the correct cable for
    each.

    The best prices that I could find are $208.65 for the
    polished TB, part number 69724:
    http://www.thehorsepowershop.com/pro...uctid=10006465
    and the unpolished version, part number 69725 goes for $185.47: http://www.thehorsepowershop.com/pro...4&cat=0&page=1
    Both are free shipping and tax free.

    I could not find any better price, especially considering the free shipping.

    I have a eMail back to the company to find out if the spacer plate gasket is a flat paper type or a permanent gasket like is on the manifold. If it is flat, I will buy some extras.

    Oh, to your other question. No cables do not come with the unit. You would have to buy one if you wanted to change arms to the alternate length.

  20. #20
    Member Sam-SS's Avatar
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    Ok, I placed my order for the polished 80mm TB and found that the free shipping is for orders that exceed $200. So one might be better to buy the polished unit as it gets free shipping but the unpolished one is under $200 so it would not. The free shipping would help offset the additional cost of the polished unit.

    ...>>Sam

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