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  1. V

    Need help with installing a 454 in a 1979 GMC Sierra 4x4 frame

    Thanks everyone for your responses. I finally got the motor in. Ended up buying competition style motor mounts from Off Road Design. They fit and had enough clearance for my long tube headers. I have a new summit racing 8 inch oil pan on it and it barely clears on the right side. Here are some...
  2. V

    Need help with installing a 454 in a 1979 GMC Sierra 4x4 frame

    And I think my terminology is off a little. Lol. I’m calling the parts that bolt to the engine the clamshells and I think people are calling those the cups. I’m calling the metal parts with the rubber inside them the engine mounts and maybe those are the clamshells? And the parts that are bolted...
  3. V

    400 to 454 swap

    Yeah I think I’m calling the wrong thing clamshells. I’m calling the part that bolts to the motor the clamshell but I guess people call that the cup? The rubber mounts with the metal covers are the clamshells? And the perches are the parts that bolt to the frame with the holes in them for the...
  4. V

    Mystery Motor Mounts

    I know it’s been a while but I’m having this issue also in my 79. I got 350 motor mounts and they still don’t line up. Is it because I’m using 454 clamshells on the engine? Did you use the 350 clamshells along with the 350 motor mounts?
  5. V

    400 to 454 swap

    I bought big block engine mounts and they definitely don’t fit the holes on the perches. I got 350 mounts and they did fit the holes but when I lowered in my 454, the holes don’t line up. They did on one side and the other side was about an inch away from the mounting holes. I used the...
  6. V

    Need help with installing a 454 in a 1979 GMC Sierra 4x4 frame

    Also I forgot to say that I just sat the engine down in without the transmission and transfer case on it yet.
  7. V

    Need help with installing a 454 in a 1979 GMC Sierra 4x4 frame

    I bought new 350 motor mounts with the rubber inside and actually used window weld to put in all the open space inside them to make them stronger. The 454 ones I bought wouldn’t match up holes with my frame perches. The 350 rubber mounts match up so I took the 350 rubber mounts and attached them...
  8. V

    Need help with installing a 454 in a 1979 GMC Sierra 4x4 frame

    I’m currently restoring my dads 1979 GMC Sierra 4x4. It came with a 350 in it. I bought a Gen V 454 out of a 1991 Suburban and converted it to carbureted. My engine is finished and ready to be installed in my frame. I bought 454 engine mounts but they won’t fit the frame mounts. I read that...

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