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1973-77 GM Midsize 11 Inch Brake Rotor, 5 on 5 Inch
1973-77 GM Midsize 11 Inch Brake Rotor, 5 on 5 Inch

1973-77 GM Midsize 11 Inch Brake Rotor, 5 on 5 Inch

Hobby Stock, Front Position, Round Rotor Shape, 11 Inch Rotor Diameter, Vented Rotor Type

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1973-77 GM Midsize 11 Inch Brake Rotor, 5 on 5 Inch
1973-77 GM Midsize 11 Inch Brake Rotor, 5 on 5 Inch
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Part # 91031064
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Rotor Shape:
Rotor Diameter:
11 Inch
Rotor Type:
Rotor Style:
Plain Face
Rotor Material Type:
Cast Iron
Rotor Finish:
Rotor Thickness:
Bolt Pattern:
5 on 5"
Stud Length:
Stud Diameter:
Thread Pitch:
23.5 lbs.
MFG. Part #:
Sold in Quantity:


1973-1977 GM mid sized front brake rotor. 5 on 5" with 5/8" coarse studs installed. 11" diameter x 1".  IMCA Approved.

This rotor is designed for dirt track applications and should NOT be used for asphalt racing.

Use bearing/seal kit # 910-31042 when using this rotor on the 1973-77 Chevelle type spindle.

Use bearing/seal kit # 910-31880 when using this rotor on the 0.844" outer Camaro or 1980-up Impala type spindle.

Item Details

23.5 lbs.


This rotor fits the following spindles:

  • 1973-1977 Buick Century, Regal
  • 1975-1978 Buick Skylark
  • 1970-1978 Chevy Camaro
  • 1977-1978 Chevy Full size
  • 1973-1977 Chevy Malibu, Monte Carlo
  • 1975-1978 Chevy Nova
  • 1973-1977 Oldsmobile Cutlass
  • 1970-1978 Pontiac Firebird
  • 1973-1977 Pontiac Grand Prix, LeMans GTO
  • 1975-1978 Pontiac Ventura, Phoenix


Proper Break-In Procedure for Steel or Cast Iron Rotors

New steel/iron rotors should be bedded in before being used in racing conditions. Proper bedding will prepare the rotor surface, prolong the rotor's life, and make it more resistant to thermal checking or cracking under severe braking conditions. The following procedures should be performed when bedding in both steel and cast iron rotors. It is best to bed in a new rotor using a used set of pads, preferably ones which will not create heat rapidly. Generating heat too rapidly will thermal shock the rotors. Likewise, when bedding in a new set of brake pads it is best to perform the process on a used rotor. This new/used bedding process permits controlled bedding of each individual component.

Make sure rotor surfaces are free from oils, grease, and brake fluid. Run vehicle up to a moderate speed and make several medium deceleration stops to heat up the rotor slowly. This will help reduce the chance of thermal shock caused by uneven heating of the rotor. Pull into the pits and allow the rotor to cool to ambient air temperature. Care should be taken not to ride the brakes into the pits as this may hot spot the rotor causing premature wear to the surface or structural damage.


This rotor uses the following bearings and seals:

  • Outer Bearing Cone 912TLM11949
  • Cup 912TLM11910
  • Inner Bearing Assembly 912TS6
  • Inner Seal 912S19753
Some parts are not legal for use in California or other states with similar laws/regulations

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