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Block off plates

This is a discussion on Block off plates within the External Engine forums, part of the LSx Technical Help Section category; Do i need to run block off plates on my LTs even if my AIR and EGR have been tuned ...

  1. #1
    Member zeetwentyeight's Avatar
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    Block off plates

    Do i need to run block off plates on my LTs even if my AIR and EGR have been tuned out?
    If so where should i get them?

  2. #2
    King 0f n00bz shady milkman's Avatar
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    blacker than wesleysnipes
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    yup..as with them open they will introduce unmetered air into the system..throwing off your o2's readings and making the pcm think there is a lean condition

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    Member zeetwentyeight's Avatar
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    Quote Originally Posted by shady milkman View Post
    yup..as with them open they will introduce unmetered air into the system..throwing off your o2's readings and making the pcm think there is a lean condition
    any recommendations on where to get them?
    and isn't this for my water temp gauge and is it going to need to be replaced now?

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    Member xmarkx's Avatar
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    yes you do. replace it before you install the headers because it will be much harder to replace afterwards.

    also, good info about the AIR and EGR systems!! I didn't know that.

  5. #5
    King 0f n00bz shady milkman's Avatar
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    Quote Originally Posted by zeetwentyeight View Post
    any recommendations on where to get them?
    and isn't this for my water temp gauge and is it going to need to be replaced now?
    Click for full size
    Your new headers...if race style..will not come with egr/air provisions...if you do need them...I got mine from ws6store

    On the coolant sensor...yup needs to be replaced..looks like you didn't unplug it when uninstalling your manifolds.
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    megs 02sunsetorangeZ's Avatar
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    Me and my brother just put lt's on my car friday and we forgot block off plates so we just made them in about 20 minutes.. They work just fine.

  7. #7
    Exalted Cyclops 67CamaroRSSS's Avatar
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    If you're deleting the EGR and AIR then you should've purchased LT's without those hook ups. This eliminates the need for block off plates.

    Otherwise block off plates are fairly easy to fab up.
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  8. #8
    Member xmarkx's Avatar
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    Quote Originally Posted by 67CamaroRSSS View Post
    If you're deleting the EGR and AIR then you should've purchased LT's without those hook ups. This eliminates the need for block off plates.

    Otherwise block off plates are fairly easy to fab up.
    you can also find them on eBay for cheap

  9. #9
    Veteran 0rion's Avatar
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    thunder racing has them too......I'm with the other guys though. If you have the ability to cut thin metal I would just trace out the flanges and cut your own. Very very simple. You can also use a 1 3/8" adjustable freeze plug to plug the egr port on the intake.

  10. #10
    Senior Member Z28boy2000's Avatar
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    i made mine it was so easy. just trace the air/egr provisions and then cut them out of a thin metal. Throw a little rtv on them to seal them properly and your good to go for under 15$
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  11. #11
    Member zeetwentyeight's Avatar
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    Quote Originally Posted by shady milkman View Post
    Your new headers...if race style..will not come with egr/air provisions...if you do need them...I got mine from ws6store

    On the coolant sensor...yup needs to be replaced..looks like you didn't unplug it when uninstalling your manifolds.
    On the air and egr i want a emission inspector to look under my hood and look legal and yea i didn't get the race style

    I went to take it off before but it was leaking coolant all over my garage haha

  12. #12
    Member xmarkx's Avatar
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    put the block off plates on and then hook up the air and egr so the plates are sandwiched.. it might work and if it does no one would know by looking lol

  13. #13
    Member zeetwentyeight's Avatar
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    Quote Originally Posted by Z28boy2000 View Post
    i made mine it was so easy. just trace the air/egr provisions and then cut them out of a thin metal. Throw a little rtv on them to seal them properly and your good to go for under 15$
    What metal did you use and how did you cut it?

  14. #14
    Member bberretta's Avatar
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    When I made them for my motorcycle a few years ago I went to Home Depot and picked up a some aluminium stock (about 1/8" thick) and used a Dremel with a cut off wheel to make them. Very easy to do. Literally took about a half hour to make the plates- longest part was polishing them. Just use the gaskets off the EGR and AIR connections on your new plates.

    Now, if you're trying to get past inspection, you could do the sandwich method and leave everything installed, just blocking off the pipes. Keep in mind that you'll need to have the PCM tuned to cut out the codes it'll throw when you block off the EGR and AIR.

  15. #15
    Member zeetwentyeight's Avatar
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    Egr is deleted but im waiting for my header swap and ory to tune out air

  16. #16
    Member JRENIGAR's Avatar
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    Quote Originally Posted by zeetwentyeight View Post
    any recommendations on where to get them?
    and isn't this for my water temp gauge and is it going to need to be replaced now?
    Click for full size
    I broke mine installing the headers and it made the car run funny and die at idle sometimes, but its just as easy to replace with headers as it is with manifolds on. About $15 at parts store and 5 min time. Easy...

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