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Technical '49 Pontiac

Discussion in 'The Hokey Ass Message Board' started by jules73, Feb 4, 2022.

  1. jules73
    Joined: Sep 26, 2012
    Posts: 5

    jules73
    Member

    Screenshot 2022-02-04 21.30.17.png Hi everyone,
    Jut picked up this '49 Pontiac Silver Streak over here in the UK.
    First job is wide whites, I know of someone with a set of L78s hes taking off his Buick. which are a great price.
    I know the Pontiac had 7.10 x 15 but has anyone fitted L78s on a similar car and where they too big for it and did they rub?



    Screenshot 2022-02-04 21.30.17.png
     
  2. Glenn Thoreson
    Joined: Aug 13, 2010
    Posts: 1,017

    Glenn Thoreson
    Member
    from SW Wyoming

    I never did that but I'd doubt it would be a problem . Nice looking car!
     
  3. greybeard360
    Joined: Feb 28, 2008
    Posts: 2,096

    greybeard360
    Member

    A 7.10-15 equates to a G78-15 which would now be a P21575R15
    A 8.20-15 equates to a L78-15 which would now be a P23575R15

    Quite a bit of difference in size. The L78 probably won't fit your wheels.
     
  4. wvenfield
    Joined: Nov 23, 2006
    Posts: 5,647

    wvenfield
    Member

    My later Pontiac came with 7.10 from the factory. I had L78 with no clearance problems but they were on aftermarket wheels.
     
  5. BJR
    Joined: Mar 11, 2005
    Posts: 11,013

    BJR
    Member

    If it runs good, I would keep the stock engine, until it goes bad. But you didn't ask. :D
     
  6. choptop40
    Joined: Dec 23, 2009
    Posts: 5,737

    choptop40
    Member

    nice poncho...good luck ....
     
  7. PhilA
    Joined: Sep 6, 2018
    Posts: 2,104

    PhilA
    Member
    1. Hydro Tech

    Dunno about the tires but the stock width ones offer plenty grip- you'll need arms like Popeye to park it with L78's on.

    Oh, and the trim below the headlight loosens off (if it's not rusted solid), as does the trim on the hood. There's no reason for the "normal" bucktooth grille surround. Mine was like that and took about 5 minutes to align.
    Don't treat it like a racing car. You will be holding up traffic, yessir. Should you feel bad about it? Nope.

    Phil
     

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