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Thread: 5.3 in my 1990 RCSB motor mounts

  1. #1
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    5.3 in my 1990 RCSB motor mounts

    I was wanting to know who, if anyone, made the motor mounts for this swap that I didn't have to do any modifications to?
    Hoping to find some that just bolt up and go on.
    Thanks in advance.

  2. #2
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    Search Ebay for LS1 engine mounts/motor mounts. There are different ones available for different applications. The one with 6 bolt holes are the most common. The 7 hole units move the engine back about an inch towards the firewall.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  3. #3
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    Quote Originally Posted by RedHeartbeat View Post
    Search Ebay for LS1 engine mounts/motor mounts. There are different ones available for different applications. The one with 6 bolt holes are the most common. The 7 hole units move the engine back about an inch towards the firewall.
    which is better?
    or I guess which puts the motor in the correct place for the tranny cross member? (4L60E will be what i use)

  4. #4
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    I use the 6 hole units on my conversions, more room at the back of the engine plus it fits the fbody alternator better.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

  5. #5
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    Quote Originally Posted by RedHeartbeat View Post
    I use the 6 hole units on my conversions, more room at the back of the engine plus it fits the fbody alternator better.
    so it used the stock tranny crossmember bolt location?

  6. #6
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    Drill new bolt holes in the frame if they dont align, its not tough. I believe they do line up of you work with it. I built a whole new crossmember to clear my headers, convert to the 80e transmission and clear true dual pipes holding the pipe way up high.
    See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709

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