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Technical GM Bellhousings Interchange

Discussion in 'The Hokey Ass Message Board' started by gatz, Dec 8, 2018.

  1. gatz
    Joined: Jun 2, 2011
    Posts: 1,295

    gatz
    Member

    Courtesy of Hemming Motor News.

    Thought I'd pass along a good source of info regarding GM Bellhousings.
    Seems to be a topic that pops up frequently.
    If anyone wants this in pdf form PM me.
    gatz

    GM Bellhousings.jpg
     
    Hamtown Al likes this.
  2. Mr48chev
    Joined: Dec 28, 2007
    Posts: 23,653

    Mr48chev
    ALLIANCE MEMBER

    Worth saving for the "will that fit" file.
     
  3. bubba55
    Joined: Feb 27, 2011
    Posts: 274

    bubba55
    ALLIANCE MEMBER

  4. DDDenny
    Joined: Feb 6, 2015
    Posts: 10,189

    DDDenny
    Member
    from oregon

    One of the belhousings that have become hard to find (at least reasonably priced) is from the 64-67 Chevy II, contrary to advertisers calling them V8 belhousings, these were used on all engines in the 64-67 Chevy II's, 4cyl, 6cyl , and V8.
    The distinguishing feature is the 7:00 opening for the clutch throwout fork where (most) all others have a 9:00 opening.
    The Chevy II belhousings will only accommodate a 10&1/2" flywheel (153 tooth), many people think this limits clutch choices but keep in mind this same setup is what was put behind the factory 327/350 HP engines.
    As with their original application; these can be a real problem solver for other cars with space limitations.

    GM casting #3849309

    [​IMG]

    There is a 62/63 version that looks nearly identical but it will only accept the first generation transmissions with the smaller dia bearing retainer, this includes the late 63 Corvette Muncie 4speed.
     
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  5. studebakerjoe
    Joined: Jul 7, 2015
    Posts: 333

    studebakerjoe
    Member

    DDDenny, thanks for the pic/part number. I'll keep an eye out for these at work as people still bring in aluminum bellhousings to the scrapyard I work at.
     
  6. Fordors
    Joined: Sep 22, 2016
    Posts: 1,323

    Fordors
    Member

    True, the 327/350 horse L-79 used the 10 1/2” clutch but actually the L-88 427 used a 10 1/2” also. I have one in my coupe using the L-88 15# nodular iron 153 tooth flywheel and clutch assembly. Bigger is not necessarily better in regards to clutch assemblies.
     
    deucemac likes this.

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