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Visual differences between ls1 and ls6 engine?

This is a discussion on Visual differences between ls1 and ls6 engine? within the Firebird / WS6 forums, part of the Vehicle Specific category; What are some of the visual differences between a ls1 engine and a ls6 engine? Besides the casting numbers? I ...

  1. #1
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    2001 Trans Am Ws6

    Visual differences between ls1 and ls6 engine?

    What are some of the visual differences between a ls1 engine and a ls6 engine? Besides the casting numbers? I am having a hard time looking at the back of the block and I don't anything to drop the motor at this time.. so are there any easy visual differences between them?

    LS6 engine block casting number 12561168
    LS1 engine block casting number 12559378

    I am aware of the casting numbers..

  2. #2
    Senior Member raynor139's Avatar
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    Pewter
    2002 Trans Am WS6 M6

    Only guaranteed way to verify is the block casting number far as I know.

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    Senior Member tatertot91's Avatar
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    Sunset Orange Metalic
    2001 Camaro SS

    By the coolant crossover line on the block the LS1 blocks have a bullseye where the LS6 blocks dont. I believe there are 4 along the top front of the block

    No big difference between the two.

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    2001 Trans Am Ws6

    Ok, I'll check that out tomorrow morning when I can see it. Thanks.

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    REAPER Z28 reaper ws6's Avatar
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    what are the coolant cross over lines? and were exactly are they located.

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    Senior Member tatertot91's Avatar
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    Sunset Orange Metalic
    2001 Camaro SS

    Quote Originally Posted by reaper ws6 View Post
    what are the coolant cross over lines? and were exactly are they located.
    They run across the front of the heads, small silver tube with a T that has a hose running to the Throttle body (where people bypass it)
    The flow coolant from the top of the heads back to the radiator
    Some know these as steam tubes

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    2001 Trans Am Ws6

    Does anyone have a picture of this? So far I can't find any tube with a T on it, and the hose that is going to the TB looks like a vacuum hose.

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    2001 Trans Am Ws6

    again, nvm the only 3 numbers on the side driver side is 241, it seems to be a 350 gm goodwrench block however, is this just a replacement block then?
    Last edited by pbguy357; 05-24-2011 at 12:22 PM.

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    Senior Member tatertot91's Avatar
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    Quote Originally Posted by pbguy357 View Post
    Does anyone have a picture of this? So far I can't find any tube with a T on it, and the hose that is going to the TB looks like a vacuum hose.
    The hose is on the bottom of the TB on the drivers side
    ill try and get a pic later

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    O U 8 1 2 Spaz's Avatar
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    the LS1 and LS6 differ in color slightly... but you'd only be able to tell if they were side by side... the LS6 has better cooling passeges in the block and a few other minor bits...

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    2001 Trans Am Ws6

    When I first bought the car, and i bought it from a dealer over a year ago, it dynoed at 385 rwhp when I bought it but the dealer said it was a stock engine, he clearly didn't know anything about the car and got it dynoed after I bought it at sounds unlimited. So i know it has some work done to it, but i don't know what since it was a 3 owner car with only 44k on it. It has a ported and polished TB, but I don't know all the work done to it. It is a silver block..
    Last edited by pbguy357; 05-24-2011 at 05:56 PM.

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    O U 8 1 2 Spaz's Avatar
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    Quote Originally Posted by pbguy357 View Post
    When I first bought the car, and i bought it from a dealer over a year ago, it dynoed at 385 rwhp when I bought it but the dealer said it was a stock engine, he clearly didn't know anything about the car and got it dynoed after I bought it at sounds unlimited. So i know it has some work done to it, but i don't know what since it was a 3 owner car with only 44k on it. It has a ported and polished TB, but I don't know all the work done to it. It is a silver block..
    what type of dyno was used???

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    2001 Trans Am Ws6

    chassis one if that helps.. I don't know how accurate it was or anything the people who did it didn't seem like they knew to much about since they just got a a few months befor, but thats what it read.

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    2001 Trans Am Ws6

    Quote Originally Posted by tatertot91 View Post
    The hose is on the bottom of the TB on the drivers side
    ill try and get a pic later
    Did you ever get a pic or would it be easier for me to snap one?

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    2001 Trans Am Ws6

    Nvm, turns out to a a ls6 engine all numbers match. One of the owners before completly replaced the engine with a ls6

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    Senior Member tatertot91's Avatar
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    Sunset Orange Metalic
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    What casting # is are the heads?

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    2001 Trans Am Ws6

    12564824 I believe, I just out it all back together and had all the numbers on a pad so I think its that, but if that matches to something else let me know, I lost the thread that had all the numbers on it.

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    2001 Trans Am Ws6

    question is.. should I buy the car back as salvage? Would I get my money back out of the engine? It only has 39k on the engine and trans is perfect. Would I get my money back is salvage is 1400-2200?

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    Junior Member 0lllll0's Avatar
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    i wouldnt think you would have a problem getting your money back on the motor and trans. we bought a recked z28 a few years ago for $3000 and put the motor, trans, and cpu in a 70 chevelle. just my opinion....

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    2001 Trans Am Ws6

    Well turns out they want 2,500, therefore, I'm not going to buy it back. Maybe one of you guys who reside in the midwest can get their hands on it. I don't know what junkyard they are taking it to, but I'm guess Paul's in Westville. It's a 01 Trans Am WS6 6 Speed Hurst Shifter Navy Metallic Blue with tinted taillights with Oakwood leather interior. Fiberglass hood with all SLP under the hood in the intake. It only can side rear damage to it, so engine and transmission is in perfect shape with only 39k on the LS6. Goodluck all.

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