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Thread: 425 in a '54 Roadmaster?

  1. #1
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    425 in a '54 Roadmaster?

    So I've got my '54 running pretty good after struggeling to get rid of lifer noise. But it still has tons of blowby.
    On a roadtrip now through Sweden and I have to add a quart of oil every 300-400km.
    It doesn't burn oil really, just blowby through the filler cap, valvecoverbolts, dipstick,...you name it and it blows.

    So I'm thinking of rebuilding the whole thing, but I don't want to be all out of Buick for however long that takes. So I had an idea.

    A buddy of mine has a (I think) '66 wildcat with a 425 nail. The engine is good but the car needs work. My '54 is good but the engine needs work...see where this is going?

    So I'm thinking of buying the '66, pulling the engine, dropping it in the Roadmaster, rebuilding the 322 out of it, then swap back and have the Wildcat as a nice little 'byproduct' of this whole endeavor.

    So bottom line is: will a 425 nail from '66 bolt upto/into my '54 or am I bieng too optimistic?



    Grtz from a Belgian Buick driver

  2. #2
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    No. Your current transmission with not attach to the 425 and a transmission that fits the 425 will not attach to your existing enclosed driveshaft. Certain conversions in the Buick world are very complex.

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    Quote Originally Posted by suntreemcanic View Post
    No. Your current transmission with not attach to the 425 and a transmission that fits the 425 will not attach to your existing enclosed driveshaft. Certain conversions in the Buick world are very complex.
    Right, so I best go out hunting for a good 322 to throw in then. I assume the '54-'56 nails are all basically thesame as far as fitting goes?

    Or any other engines that could bolt upto the '54 drivetrain?

  4. #4
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    Not easily
    Tom Telesco
    Classic and Muscle Automotive
    12 Cook St.
    Norwalk, CT 06853-1601
    Day Phone 203-324-6045 ET
    NailHead Mini-Starters '53-'66
    Adjustable Roller Tip Rocker Arms - All NailHeads
    Custom forged pistons
    Front & rear neoprene seals
    Many other "Nail" parts
    "If I can't get it, you don't need it!"

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    I did a 401 nailhead swap into a 1956 Buick. As far as engine swaps go, it was on the easier side. Its a 4 day project if you have your ducks in a row, or a 6 month project if you don't. On the plus side, youll have a 3 speed automatic, on the negative side, you have to swap out the rear end to go open drive.

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