Goodyear vs Firestone bias-ply

Discussion in '1970 - 1973 Specific' started by oscc2, Oct 22, 2017.

  1. oscc2

    oscc2 New Member

    Sep 12, 2017
    Sorry if this is an age-old question, but I'm still new to the forum. Just bought a 70 Z and it has the Firestone bias-ply tire with the 60 in the oval. I see references where people say the Goodyear is "the" correct tire for a 70. Is it a fact that the 70 only came from the factory with the GY? If so, and you're interested in correctness and you're willing to deal with the inherent issues with a non-radial, why put the Firestone on your car?
  2. oscc2

    oscc2 New Member

    Sep 12, 2017
    I posted this question over a week ago, with no replies. Does no one have the facts on what the 70 OEM tires were?
  3. 70 Proof

    70 Proof Veteran Member

    Sep 28, 2014
    Southern Utah
    My 70 sport coupe (granted it's not a Z) came from the Van Nuys factory with Firestone Deluxe Champions dual pinwall E-78-14 tires. The attached pic shows one of the original tires in the trunk.
    FWIW- I have a 1970 Camaro ad showing a70 SS with Firestone Wide Ovals.

    Attached Files:

  4. roeville

    roeville Veteran Member

    Oct 9, 2000
    SF East Bay CA
    The only way to know for sure what tires were supplied with the car is to have the original build sheet (box 90 I think). Chevrolet plants did not keep records of tire brand usage. I don’t recall seeing any 1970 Z28’s with Firestone Wide Ovals but I believe either factory could have switched brands depending on supply levels - so it would be possible. In 1971 Firestone’s were more common by mid-year. Some people just like the looks of bias ply tires for a period correct look. Maybe the person that owned your car was only able to get Firestone’s.

    Firestone does make the Wide Oval radial for that vintage look with better ride quality. (They still look like a radial to me.) I drive my car on both but prefer the bias-ply for the correct look. Sacrificing the ride quality, which is not as bad as everyone would have you believe, is worth it to me.

  5. COPO

    COPO Veteran Member Lifetime Gold Member

    Sep 15, 1999
    Ontario, Canada
    My 71 Z28 I owned from 1975-77 with Wide Ovals. They rode fine and would light up easy.

  6. FlaJunkie

    FlaJunkie Veteran Member Lifetime Gold Member

    Mar 24, 2001
    Rockledge, Florida
    Never saw a 1970 Z28 with any factory tire other than Polyglas.
  7. COPO

    COPO Veteran Member Lifetime Gold Member

    Sep 15, 1999
    Ontario, Canada
  8. 70lt1z28

    70lt1z28 Veteran Member Gold Member

    Oct 3, 1999
    Beavercreek, Ohio, USA
    The SS's were F70-14's?
    F60-15's for the Z.
    The F60 Firestones may not have been as available in 1970.
  9. COPO

    COPO Veteran Member Lifetime Gold Member

    Sep 15, 1999
    Ontario, Canada
    Option sheet for the SS in 70 specifies, F70 x 14 Wide Oval White Lettered.
  10. Gary S

    Gary S Administrator Lifetime Gold Member

    Apr 14, 1999
    Bismarck, North Dakota
    That simply means a 70 series white lettered tire. My SS came with Goodyear wide oval white lettered tires. Goodyear and Firestone tires were both used interchangeably as needed to keep production rolling no matter if the car was an SS or a Z28.

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