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Model A Identification

Model A Vehicle Identification

Body Type Identification Charts

How to Tell a Briggs From A Murray

Glass Logo Specifications


The content MAC's presents on its "Vehicle Identification & Specification" pages & in its catalogs is for information use only and is intended to be used as a guide. While MAC's makes every effort to ensure accurate content, occasionally errors may occur. MAC's does not take responsibility & will not be held liable for any automotive parts purchases, repairs or restoration decisions made as a result of information presented here or anywhere in its catalogs.

Model A Specifications

Wheel Specifications

Tire Specifications

Tire Tread Images

Front Brake Specifications

Rear Emergency Brake Specifications

Front Axle & Spindle Specifications

7-Tooth Steering Gear Specifications

2-Tooth Steering Gear Specifications

2-Tooth Steering Gear Housing Casting

2-Tooth Steering Gear Box Information

600W Oil Usage

Rear Axle Specifications

Front Spring Specifications

Rear Spring Specifications

Cylinder Head Specifications

Engine Specifications

Piston Specifications

Piston Ring Specifications

Connecting Rod Specifications

Camshaft Specifications

Crankshaft Specifications

Flywheel Specifications

Valve Specifications

Oil Pump Specifications

Transmission Specifications

Clutch Specifications

Radiator Specifications

Zenith Carberetor Specifications

What Type Of Carburetor Do You Have?

Water Pump Specifications

Fan Blade & Belt Specifications

Gas Tank Specifications

Generator Specifications

Battery Specifications

Starter Motor Specifications

Distributor Assembly Specifications

Spark Plug Specifications

Interior Lights Specifications

Wiring Books

Cylinder Block Specifications

Windshield Wiper Information

Sheet Metal Information

Hood Specifications

Vehicle Identification

1928-29 STANDARD COUPE (45-A)

1928-29 SPECIAL COUPE (49-A)

1930-31 STD & DLX COUPE (45-B)

1928-29 BUSINESS COUPE (54-A)

1928-29 SPORT COUPE (50-A)

1930-31 SPORT COUPE (50-B)

1929 CABRIOLET (68-A)

1930-31 CABRIOLET (68-B)

1930-31 VICTORIA (190-A)


1928-29 TUDOR SEDAN (55-A)

1930-31 TUDOR SEDAN (55-B)


1929-31 2-WINDOW FORDOR (170-A,B)







1930-31 DELUXE ROADSTER (40-B)



1930-31 DELUXE PHAETON (180-A)

1928-29 OPEN CAB PICKUP (76-A)

1930-31 OPEN CAB PICKUP (76-B)

1928-29 CLOSED CAB PICKUP (82-A)

1930-31 CLOSED CAB PICKUP (82-B)

1928-29 STATION WAGON (150-A)

1930-31 STATION WAGON (150-B)

Model A Fordor Body Style Identification


1929-31 (170-A,B) 2 WINDOW 4 DOOR SEDAN




Model A Body Style Identification Front & Side View


1928-29 Front View

1928-29 Cowl Side View


1930 Front View

1931 Front View

1930-31 Cowl Side View

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Body Type ID Chart
Passenger Vehicles

Body Name 1928 1929 1930* 1931

Standard Phaeton



35B 35B
Deluxe Phaeton - - 180A 180A
Standard Roadster 40A 40A 40B (Std.) 40B (Std.)
Deluxe Roadster - - 40B (Dlx.)

40B (Dlx.)

Standard Coupe

45A 45A 45B (Std.) 45B (Std.)
Deluxe Coupe - - 45B (Dlx.) 45B (Dlx.)
Special Coupe 49A 49A - -
Sport Coupe 50A 50A 50B 50B
Business Coupe 54A 54A - -
Tudor Sedan 55A 55A 55B (Std.) 55B (Std.)
Deluxe Tudor Sedan - - - 55B(Dlx.
Leatherback Fordor (Brown) 60A 60A - -
Leatherback Fordor (Black) - 60B - -
Steelback Fordor - 60C** - -
Cabriolet - 68A 68B 68B
(Slant Window)
- - - 68C
Station Wagon - 150A 150B* 150B
Town Sedan
- 155A 155C 155C
Town Sedan
- 155B 155D 155D
Standard Fordor
(Slant Window)
- - - 160A
Town Sedan
(Slant Window)
- - - 160B
Deluxe Fordor - - - 160C
Standard Fordor (Murray) - 165A 165C 165C
Standard Fordor (Briggs) - 165B 165D 165D
Standard Fordor
(2 Windows)
- 170A** 170B (Std.) -
Deluxe Fordor
(2 Windows)
- - 170B (Dlx.) 170B (Dlx.)
Victoria - - 190A 190A
Convertible Sedan - - - 400A

Commercial Vehicles

Body Name



1930* 1931
Open Cab Pickup 76A 76A 76B* 76B
Closed Cab Pickup 82A 82A 82B* 82B
“A” Panel Delivery 79A 79A 79B* 79B
“AA” Panel Delivery
85A 85A 85B* 85B
Deluxe Delivery (Standard) 130A 130A 130B* 130B
Deluxe Delivery
(Drop Floor)
- - 130B 130B
“AA” Panel Delivery (157") - - - 210A
“A” Panel Delivery
(Drop Floor)
- - - 225A
Special Delivery - - - 255A
Town Car Delivery - - - 295A
Deluxe Delivery (“AA”) - - - 300A

* Change-over from 1929 to 1930 models was in January, 1930 for passenger cars & in June, 1930 for commercial vehicles.

** If you cannot decide if your car body is a 60C or a 170A you can quickly tell by examining the front door post. If it is all steel, it is a 170A. If it has wood parts, it is a 60C.

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How to Tell a Briggs From A Murray

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Glass Specifications

To please the perfectionist, we offer Concours grade windows – intended for car show & points competition automobiles. These are superior quality 1/4" laminated safety glass (AS1 CAT-II). Exposed edges are beautifully polished or black edged & the original manufacturers sandblasted script (logo & date, sometimes referred to as the “bug”) is duplicated to reproduce the O.E.M. appearance (because they’re concours, tint options are not available). These details are applied with great care & meticulous craftsmanship.

Black edging refers to the process used to seal exposed glass edges & was necessary in the early years of automobile manufacturing. Early laminated safety glass often separated at the edges, allowing water & other contaminants between the panes. The solution was to seal the edges with a sealant. Advances in the laminating process rendered black edging obsolete in 1941, but MAC's craftspeople have re-discovered & are practicing this lost art for the detail oriented customer.

You can find details about the correct logo for your
A in book #JS1, “Judging Standards.

Year: 1928-1931
Part #: 28-20910-1
More Info Buy Now

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Wheel Specifications

Material Steel

Diameter 1928-29 21", 1930-31 19"

Rim Drop center type; width, 1928-29 2-3/4", 1930-31 3"

Number of Spokes 30, 1/4" diameter

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Tire Specifications

Size 1928-29, 4.50" x 21" 1930-31, 4.75" x 19"

Recommended Tire Pressure 35 Lbs

Station Wagon 5" x 21" or 19", pressure 40 lbs

Tread Width 21" = 3.75", 19"3.90"

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Tire Tread Images

19" or 21"

19" or 21"

19" or 21"

19" or 21"

19" or 21"

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Front Brake Specifications

Braking Power Front, 40%; Rear, 50%

Drum Diameter 11" +/- .010"

Drum Width 1-3/4"

Brake Shoe Length 14"

Brake Shoe Width 1-1/2"

Brake Shoe Lining Thickness 3/16"

Brake Shoe Material Woven wire & asbestos

Brake Rod Length 51-7/16" thru 51-1/2"

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Rear Emergency Brake Specifications

Drum Diameter 9-5/8"

Drum Width 1-3/4"

Brake Shoe Length 28-3/4"

Brake Shoe Width 1"

Brake Shoe Lining Thickness 3/16" (original), 1/8" (ours)

Brake Shoe Material Woven wire & asbestos

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Front Axle & Spindle Specifications

Material Chrome alloy forging

Tensile Strength 125,000-145,000 PSI

Caster 5" (forward tilt)

Toe In 1/16" +/- 1/32"

Camber 1-13/16"

Spindle Bolt Diameter .8125" +/- .005"

Spindle Bolt Length 5-5/16"

Spindle Bolt to Bearing Clearance .001"-.002"

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7-Tooth Steering Gear Specifications

Turning Radius 17' (34' diameter)

Steering Gear Ratio 1928-29, 11-1/4:1

Steering Wheel Diameter 1928-29, 17-1/2"

Pitman Arm Length 6-7/8" hole center to ball center

Ball End Angle to Shaft 14°

Sector Shaft Bearing Clearance .001"-.002"

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2-Tooth Steering Gear Specifications

Turning Radius 17' (34' diameter)

Steering Gear Ratio 1930-31, 13:1

Steering Wheel Diameter 1930-31, 17"

Pitman Arm Length 6-7/8" hole center to ball center

Ball End Angle to Shaft 14°

Sector Shaft Bearing Clearance .001"-.002"

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2-Tooth Steering Gear Housing Casting Markings

Dates Gemmer Ford
February - May 1929 “GEMMER” & “PAT. PDG.” in raised letters Raised “F” on the side
February - May 1929 “GEMMER” & “PAT. PENDING” in indented letters Raised “F” on the side
April 1929 - Mid 1930 “GEMMER” & “PATENTED” in indented letters Raised “F” on the side
January 1930 - End No ID Indented “A-3550-C” on the engine side
January 1930 - End No ID Indented “A-3550-C” on the engine side & raised 5/16" or 9/16" letter “F” on the other side
Except for minor machining differences, all the above housings are virtually identical mechanically
& all new parts furnished will fit each one.

Ford & Gemmer were the two manufacturers of the 2-tooth steering box. All parts are interchangeable, except the worm gear, 2 races & 2 bearings. The Ford box has a large “F” on the outside where the worms are located. This change was made in December of 1930 (See page 518 Service Bulletins). The Ford box used a #9 roller bearing, while the Gemmer box used a #13 roller bearing. This also changes the taper on the bearings & races. The only parts available today are for the Gemmer box; therefore, if you have the Ford box with #9 roller bearings & it becomes necessary to change any of the 5 parts, then you must convert to all 5 of the Gemmer components (A3524CD, (2) BB3571, A3553D, BB3552)

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600W Oil Usage Specifications

Transmission 1 pint

Rear End 1-1/2 Quarts

7-tooth Steering Box 7-3/4 ounces

2-tooth Steering Box 4-1/2 ounces

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Rear Axle Specifications

Type Three quarter floating

Material Special Ford carbon manganese steel

Gear Ratio 3.78:1 (34-9) Early 1928: 3.7:1 (37-10) Trucks: 4.11:1 (37-9) 1928-29 Roadsters: 3.54:1 (39-11)

Pinion Bearing Cup Double taper roller type B4616

Bearing Cup B4222

Differential Bearing B4221

Ring Gear 8.4" pitch diameter, 1-3/16" wide teeth

Axle Shaft 1-1/8" diameter, 1.128"-1.130"

Dimension From Housing Flange to Bearing Shoulder Before 1929-1.370"-1.372", After 1929-1.365"-1.367"

ID of Wheel Hub 3.188"-3.190": max. wear 3.185"

Axle & Drive Shaft Seal B4245

Inner Axle Seal B4245

Differential Lubricant 600W

New Bearing Torque 20 foot pounds

Bolt Torque 35 foot pounds

Axle Backlash .010"-.015"

Axle End Play .015"-.020"

Length of Full Spline 2-1/2"

Spline Minor Diameter .901"-.911"

Spline Outer Diameter 1.090"-1.091"

Pinion Bearing Torque 15-20 foot pounds

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Front Spring Specifications

Material Chromium steel alloy

Front Spring Leaf Width 1-3/4"

Front Spring Free Length 30-13/16" to 30-15/16"

Leaf Thickness 1-31/32" to 2-1/16"

Spring Off Car- Height from Top to Bottom as Sitting on Floor 6-15/16" to 7-1/16"

Spring Off Car- Center of Eye to Eye 30-5/8" to 30-13/16"

Ford blueprints called for each leaf to be coated with
a thick paste of graphite ground in oil.
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Rear Spring Specifications

Material Chromium steel alloy

Rear Spring Leaf Width 2-1/4"

Rear Spring Free Length
Tudor & Fordor: 38-7/8" to 39"
Roadster & Coupes: 38-7/8" to 39-1/2"

Ford blueprints called for each leaf to be coated with
a thick paste of graphite ground in oil.
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Cylinder Head Specifications

1928 Head 4.3:1 compression ratio, 47.3 HP, 242cc displacement. Compression in individual cylinders: 80, 85, 83, 82 PSI

1930 Head 4.1:1 compression ratio, 44.3 HP, 258cc displacement. Compression in individual cylinders: 77, 79, 82, 79 PSI

Normal Listed Compression A6050A, 75 pounds; A6050B, 110 pounds; B6050, 90 pounds

Head Nut Torque 50 foot pounds

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Engine Specifications

Rated Horsepower 24.03 SAE

Brake Horsepower 40 HP at 2200 rpm (Model AF 28 at 2000 rpm)

Firing Order 1-2-4-3

Compression Ratio: 4.11:1

Compression Pressure: A6050A head, 76 PSI A6050B head, 110 PSI B6050 head, 90 PSI

Piston Displacement 200.5 cubic inches

Bore 3.876" (Model AF: 3.050")

Stroke 4.250"

Torque 128 foot pounds at 1000 rpm

Cylinder Offset from Crankshaft Centerline 1/8"

Crankshaft to Camshaft Centerline 4.155"

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Piston Specifications

Displacement 200.5 cubic inches

Material Aluminum

Weight 1 lb. 1-7/8 oz. (476.8 grams)

Variance in Weight of Pistons +/- 2 grams

Weight with Rings Installed 1 lb. 4-1/2 oz. (581.2 grams)

Weight with Rings & Pin 1 lb. 8-3/4 oz. (701.7 grams)

Diameter 3.8745" (Bore 3.875")

Length 3-29/32"

Piston Skirt .001: small on the top than on the bottom of the skirt

Piston Pin Hole .9996" to .9998" diameter

Piston Pin Diameter 1.0001" to 1.0004"

Pin Length 3.536" to 3.546"

Compression Height (Top of piston to pin centerline) 1-29/32"

Variation in Piston Compression Height .003" to .005"

Piston Pin Bushing ID .992", OD 1.0675"

Length 1.593"

Pin Fit in Rod Bushing .0003" max

Pin Fit in Piston .0002" to .0005" shrink fit

Pin Bore Parallel to Head of Piston +/- .001"

Piston Fit in Cylinder .002" max

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Piston Ring Specifications

Ring Diameter Same as piston, 3.875" stock

Ring Groove Depth, 7/32", Width - Upper 2, 1/8" Lower, 5/32"

Ring Taper .001"- narrower at the top than the bottom

Ring Clearance in Groove .001" to .002"

Ring End Gap Top .012" to .015"; Middle .010" to .012"; Lower .008" to .010"

All piston ring sets are US made Grant or Hastings brands with 3 rings. The gap of the rings must not line up, MAC's suggests keeping them about a 1/4 turn from each other.
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Connecting Rod Specifications

Material Steel forging

Weight 1 lb, 6 oz.

Balance Weight 552 grams +/- 1 gram, crank end 198 grams +/- 1 gram, pin end

Length 7-1/2" center to center

Crankshaft Bearing 1-1/2" diameter, 1-5/8" wide

Piston Pin Bearing 1" diameter, 1-5/8" wide

Bearing Side Clearance .008" to .012"

Pin Side Clearance .040" to .053" between pin bosses

Piston Pin Clearance .0005"

Crankshaft Clearance .001"

Bearing Cap Bolt Torque 40-50 foot pounds.

Connecting rod is assembled with oil dippers toward camshaft.

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Camshaft Specifications

Shaft Diameter 7/8"

Bearing Diameter 1.560"

Block Bore Diameter 1.561"

Bearing Clearance (Max.) .003"

Bearing Length Front, 1-3/4"; Center, 2"; Rear, 1"; 4th (1928), 7/8"

Lift of Cam .030" (Model B: .339" exhaust; .334" intake)

Duration 236º

Lobe Center Angle 113-1/2º

End Play Spring Tension Approximately 35 pounds

Timing Gear Mounting Flange 2-5/16" diameter, 5/16" thick

Camshaft Material Special Ford carbon manganese steel

Cam Shaft Gear Bakelized material

Number of Gear Teeth 50

Camshaft Gear Type Spiral teeth

Gear Backlash .003" to .005"

Gear Rotation Speed 1/2 of crankshaft

Camshaft Straightness .0005" to .001"

Variation in Eccentricity of Pitch Diameter of Gear Teeth .0015"

Variation in Maintaining Center Distance of Mating Gears +/- .001"

Gear Tolerances in Regular Spacing of Teeth 0.0"

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Crankshaft Specifications

Material Ford carbon manganese steel

Weight 28 pounds

Length 26"

Diameter 1.624" main bearings; 1.499" crank pins

Length of Main Bearings Front & Center, 2"; Rear 3"

Length of Crank Pins 1-5/8"

Crank Pin Taper & Roundness .0005" to .001"

Total Main Bearing Surface 11-1/2 square inches

Rear Flange Thickness 3/8"

Crankshaft Gear 25 spiral teeth

End Clearance .004" to .007"

Main Bearing Clearance .001"

Crankshaft Straightness .0005" to .001"

Main Bearing Cap Torque 80-100 foot pounds

Distance from Top Surface of Front Cross Member to Crankshaft Centerline 2-33/64"

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Flywheel Specifications

Weight 63 lbs., 4 oz. (Model B 52 to 55 lbs.)

Balance Within 15 in./oz.

Ring Gear Shoulder Diameter 12.470"

Ring Gear Outside Diameter 14.2"

Number of Ring Gear Teeth 112

Ring Gear to Starter Drive Ratio 11.2: 1

Flywheel Bolt Torque 65 foot pounds

Pilot bearing hole is concentric with crankshaft flange shoulder within .002" TIR (Total Indicator Reading).

Clutch mounting surface & clutch disc surface must run true to crankshaft within .005" TIR (Total Indicator Reading).
Clutch mounting shoulder diameter must be concentric with crankshaft flange diameter within .005" TIR (Total Indicator Reading).

Flywheels provide momentum to keep the crankshaft spinning. As the flywheel spins faster, a vibration will occur if it’s out of balance. It’s best to have your flywheel, with clutch & pressure plate, balanced so that when you place in the clutch disc & reinstall the pressure plate it will retain balance.

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Valve Specifications

Lift .287" with .015" clearance

Seat Angle 45º

Seat Width 3.32"

Stem Diameter .311"

Valve Length 5.677"

Head Diameter 1.537"

Valve Opening Diameter 1-3/8"

Port Diameter 1-3/8"

Clearance, Exhaust Valves in Guides .002"

Clearance, Intake Valves in Guides .001" to .0015"

Valve Lifter Clearance .010" to .013"

Lifter Diameter Clearance .0015"

Valve Guides .3135" ID; .5938" OD; length 2.125" (early 2.375")

Valve Spring 1.022" OD; free length 2-15/16"; comp. length
2-1/14" (57-64 lbs.); tension (closed) 34 to 38 lbs.

Valve Lifter A6500A (used with A camshaft), length 2.486";
head diameter 1.117".

Valve Timing Intake opens 7-1/2º before Top Dead Center; closes 48-1/2º after Bottom Dead Center. Exhaust opens 51-1/2º before Bottom Dead Center; closes 4-1/2º after Top Dead Center.


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