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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: 1,344


    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.

    GM Bellhousings.jpg
    Hamtown Al likes this.
  2. Mr48chev
    Joined: Dec 28, 2007
    Posts: 24,435


    Worth saving for the "will that fit" file.
  3. bubba55
    Joined: Feb 27, 2011
    Posts: 291


  4. DDDenny
    Joined: Feb 6, 2015
    Posts: 11,260

    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


    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.
    Hamtown Al, GuyW and stillrunners like this.
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  5. studebakerjoe
    Joined: Jul 7, 2015
    Posts: 374


    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: 1,686


    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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