Flywheel for a 1977 425
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500, 472, 425, 368 Discussion, Flywheel for a 1977 425 in Cadillac Engine Technical Discussion; Hey I just picked up a 425 caddy, and I'm trying to put it in a 4x4 truck infront of ...
  1. #1
    cutlass442_1966 is offline Cadillac Owners Member
    Automobile(s): Cadillac
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    Flywheel for a 1977 425

    Hey I just picked up a 425 caddy, and I'm trying to put it in a 4x4 truck infront of a 4 speed manual. Now I was told that a BOP bellhousing will work on it. But I can't seem to find a flywheel for it, probably because Cadillac hasen't made a car with a manual in so long. So I am wondering if anyone knows if there is a flywheel off of a Buick, or Olds, or something that will fit on the crank flang of the caddy motor, or if I need to get one made. So if anyone knows a trick to putting a manual behind a 425, or if any other GM motor has a similar flywheel bolt pattern, please let me know. Thanks a lot

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  3. #2
    Ted in Olympia is offline Banned
    Automobile(s): 87 T-Bird with 500, Also I part out 71-78 Eldos & sell Parts
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    Re: Flywheel for a 1977 425

    As far as I know you have to get a custom made flywheel made for the Cadillac. You have to go to Potter or MTS to buy it. You also need to modify the crank.

    Here's a link to the caddycarlo web-site and he shows how to do it.

    TED

    http://mywebpages.comcast.net/caddyc...addycarlo.html

  4. #3
    Ted in Olympia is offline Banned
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    Re: Flywheel for a 1977 425

    Here's a flywheel for you on eBay but I bet his reserve is at least $400

    http://cgi.ebay.com/ebaymotors/1968-...spagenameZWDVW

  5. #4
    cutlass442_1966 is offline Cadillac Owners Member
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    Re: Flywheel for a 1977 425

    hey, thanks a lot for the info and the ebay link.

  6. #5
    Ted in Olympia is offline Banned
    Automobile(s): 87 T-Bird with 500, Also I part out 71-78 Eldos & sell Parts
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    Re: Flywheel for a 1977 425

    Well I was wrong there, the reserve was met at $180. This would be a good buy if it would just stay put.

    TED

  7. #6
    BluEyes's Avatar
    BluEyes is offline Cadillac Owners Enthusiast
    Automobile(s): 1970 Sedan deVille hardtop
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    Re: Flywheel for a 1977 425

    That flywheel only uses a 10.5" clutch? Even guys with a 350 want an 11" one, and I thought the flywheels from MTS and so-forth allowed a 11" or larger clutch to hold up to a 500ci motor.

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