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307 vs ls1 motor mounts

This is a discussion on 307 vs ls1 motor mounts within the External Engine forums, part of the LSx Technical Help Section category; Background: I have an 84 olds 98 the has a chevy 307 motor from the time GM was culling down ...

  1. #1
    Junior Member
    Join Date
    Oct 2006

    307 vs ls1 motor mounts

    Background: I have an 84 olds 98 the has a chevy 307 motor from the time GM was culling down the number of power plants in the GM line. Both the trans and engine have always been on the weak side. The trans is again in need of replacment. With the availibilty of low mileage ls1 & 4l60e packages that seem to easy to come by. I am currently researching the motor swap. The engine compartment is quite large.The electronics is not a concern. My wife likes the car and it is a good non Corvette "road trip" car as it has a large passenger cabin and good size trunk.

    Question: The last I did extensive work on cars was before the LS1( GenIII) engine was even made.

    Does anyone know if the 307 (Gen ii ?) block and the Ls1 block (Gen iii ) about if these blocks use the same mount points for the front engine mounts?

    THe other reason for a newer eng trans package is the car is in Calif. and needs to still meet smog and also getting the 300+ HP.

    Thank You in advance,

  2. #2
    Member 98Z-28Camaro's Avatar
    Join Date
    Nov 2005
    Oklahoma City

    1998 Z-28 Camaro

    I don't know if they are exact or not, but I believe that are close. They are close enough that I think you could easily fabricate something to make it work. That is just my two cents.

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