.GEN 6 454 VORTEC!!!!

Discussion in 'Engine Performance + Maintenance' started by dAT OBS, Feb 20, 2020.

Car Parts
  1. sparky

    sparky Newbie

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    NOT IF ITS A TRUE GEN 6 BLOCK YOU CAN RUN ANY HEAD
     
  2. Supercharged111

    Supercharged111 I'm Awesome

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    With the right gasket, yes. There's only 1 gasket on the market that lets you run a MarkIV head.
     
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  3. Schurkey

    Schurkey I'm Awesome

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    I've never put older heads on the Gen 6 block...but...that seems unlikely.

    What is the brand and part number of this gasket? What makes it so special?

    Are you thinking of putting older heads on a Gen 5 block?
     
  4. Supercharged111

    Supercharged111 I'm Awesome

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    I would like to put Mark IV heads on my dad's GenV swapped Monte Carlo as you know they outflow the **** out of a GenVI. I don't recall offhand, but want to say it was Victor Reinz who makes the gasket? It has to do with the coolant holes in the gasket itself. That's the rub.
     
  5. Schurkey

    Schurkey I'm Awesome

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    There's a world of difference between the deck surfaces of Gen 5 and Gen 6.

    Yes, Victor Reinz (now Mahle) has TWO part numbers for TWO gaskets that fit the right, and left deck surfaces; and are sold to put older heads on Gen 5 blocks. 4918 (right bank) and 4923 (Left bank) are the two gaskets. You'd need one of each, and they're nearly $40 EACH.

    They're not needed on Gen 6 blocks.

    I just looked-up those part numbers a couple weeks ago, for another thread.
    https://www.mahle-aftermarket.com/m...umbnails/gasket-solutions-pdfs/ss-ga-g-05.pdf

    The Mahle aftermarket catalog I found on-line is incorrect, it shows only the 4918 part number, omitting the 4923 altogether.
     

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