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External differences among Gen 3/4 engines?

This is a discussion on External differences among Gen 3/4 engines? within the External Engine forums, part of the LSx Technical Help Section category; Hello all, this is my first post here. Are the external dimensions, mounting holes, bellhousing mounts, front accessory mounts, etc. ...

  1. #1
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    External differences among Gen 3/4 engines?

    Hello all, this is my first post here.

    Are the external dimensions, mounting holes, bellhousing mounts, front accessory mounts, etc. the same among the gen 3/4 engines?

    I've gotten conflicting information from other web sites and mechanics, so I thought I would post here. Any good links are appreciated.

    I would like to buy a cheap worn out 5.3 truck motor, for instance, get it into my 914 Porsche and all sorted out, painted, etc. then upgrade the engine. But this will take a while, and I don't want to invest in a good motor just to sit for a couple of years.

    Thanks in advance for any help. Skip in Florida

  2. #2
    Senior Member mrr23's Avatar
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    dark bowling green
    2000 corvette

    externally, the dimensions are the same. the gen IV motors relocated the knock sensors and the cam sensor.

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