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LS3 motor

This is a discussion on LS3 motor within the General Help forums, part of the LSx Technical Help Section category; I bought a 2002 trans am A4 and the guy i bought it from claims he did a ls3 motor ...

  1. #1
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    1998 Trans Am a4

    LS3 motor

    I bought a 2002 trans am A4 and the guy i bought it from claims he did a ls3 motor swap. So how do i tell if its an ls3 motor.

  2. #2
    Moderator 98TransAmWs-6's Avatar
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    98 TA WS6/ 01 C5 Corvette

    If you look at the heads they will be rectangular ports vs cathedral. If you take the intake out it should be flat I believe not the ls1 cathedral style. Also if you remove the valley cover there should be these ports that look like towers down the center, which is for the DoD system but it doesn't come functioning so they are most likely plugged. Another way is there should be a gm stamp some where on the block saying ls3 or 6.2L or something as well as a part number.

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    Firebird Encyclopedia 9T8W66's Avatar
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    `98 Formula M6 HdTp

    6.0/6.2 will be cast into the block (behind the PS Pump).
    Check your head casting numbers if they are 241's then likely it's not an LS3.
    Craig
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  4. #4
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    1998 Trans Am a4

    The heads are 862s

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    Firebird Encyclopedia 9T8W66's Avatar
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    I just did a quick search on 862 heads and it appears their off a 5.3 truck engine.

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    Member jb3golf's Avatar
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    1998 Camaro Z28 Conv. M6

    SO.......WHAT block/engine is in YOUR vehicle!!!????? Did this guy jive you or what?????

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    Moderator Cutlass's Avatar
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    1999 Formula WS6 M6-sold
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    Quote Originally Posted by ONEslowLS1 View Post
    I bought a 2002 trans am A4 and the guy i bought it from claims he did a ls3 motor swap. So how do i tell if its an ls3 motor.
    aluminum engine block and heads are one clue.

  8. #8
    Member Blue_01_Z28's Avatar
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    2001 Chevrolet Camaro Z28

    The intake if stock should be a 90mm with 4 bolts on the throttle body, Also the fuel rail doesnt have that round regulator between the two banks of injectors.

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