GM/Corvette Cast Iron Master Cylinder, 1 Inch Bore
GM/Corvette Cast Iron Master Cylinder, 1 Inch Bore
Speedway Motors

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#91031321

GM/Corvette Cast Iron Master Cylinder, 1 Inch Bore

  • 1/2" x 20 and 9/16" -18 thread
  • Replacement master cylinder if using 91035557 or 91035556
  • 1" bore size
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$52.99

/each

On Backorder

This part is Backordered. We estimate this item will ship on or before November 11th.

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Product Summary

Universal Fit, Firewall Position, Tandem Outlet Count

  • 1/2" x 20 and 9/16" -18 thread
  • Replacement master cylinder if using 91035557 or 91035556
  • 1" bore size
  • Compatible with Disc/Drum or Disc/Disc
  • Includes a piston adapter that will allow for power or manual brake systems
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Key Specs

MFG. Part #91031321
BrandSpeedway Motors
Master Cylinder Bore Size1 Inch
Master Cylinder MaterialCast Iron
FinishNatural
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855.313.9176
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Speedway Motors 91031321 Details

Universal GM Corvette style cast iron master cylinder with a 1" bore size. Compatible with Disc/Drum or Disc/Disc. Includes a piston adapter that will allow for power or manual brake systems.

Has 9/16" and 1/2" ports on both sides of the master cylinder.

Learn more about selecting the proper master cylinder for your vehicle by reading our tech article. Brake System Selection. 

Speedway Motors 91031321 Specifications

KEY SPECS
MFG. Part #91031321
BrandSpeedway Motors
Master Cylinder Bore Size1 Inch
Master Cylinder MaterialCast Iron
FinishNatural
GENERAL
PositionFirewall
Brake System TypeDisc/Drum
Outlet CountTandem
Reservoir TypeIntegral
Reservoir IncludedYes
Outlet Fitting1/2"-20 IFF
Outlet Fitting 29/16"-18 IFF
Overall Width4.38"
Overall Height5"
Mounted Length8.13"
Centerline of Holes3.25"
Sold in QuantityEach
Notes9103188 port plug kit

Ratings & Reviews

4.7

57 Reviews

Overall Assessment

Customers rate our product positively for its reliable performance, high-quality materials, ease of installation, and practical versatility. It has proven effective in a variety of applications, from street rods to classic car restorations, due to its flexible fittings and compact design. Regardless of make or model, this master cylinder enhances braking power and gives a firm, secure pedal feel. Issues, like a leaky lid or the occasional defective unit are rare. Some customers wish there were clear instructions on how to choose the best paint for it. However, users recommend the product for its superior function over competitors, affirming customer satisfaction and trust in our product's performance.

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4.7

57 reviews

5

46

4

6

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Most Liked Positive Review

5.0

Dual Port Master Cylinder

This is the perfect master Cylinder for all Hot Rods that have frame mounted master cylinder ,with Ports on Both sides of the cylinder it can be used in many configurations , I used it on 3 of my Hot Rods , 55 Ford Truck,39 Ford Coupe ,32 Ford Coupe , Works great , I had a hard time finding the one with dual ports until I called Speedway Tech Line and got correct part number !!! Thanks Speedway you go me Going and Stopping !

Most Liked Negative Review

3.0

I bought this product to replace a new one that was defectiv

I had purchased a power steering kit from Speedway a few months ago and the master cylinder was defective. I needed it quick so I just bought it outright because there customer service jerked me around on the last defective item I tried to replace. This one worked.

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Great product

5.0

2 months ago

Ron

Leavenworth Ks

Verified

Great replacement for my stock master cylinder in my 1963 Chevy Impala when converting to disc on the front.

Would Recommend

Yes

5.0

6 months ago

Chuck Leckbee

Odessa tx

Verified

It replaced a single bowl , worked great

Would Recommend

I have purchased several of them

5.0

11 months ago

Parts changer

Dallas Tx.

Verified

It looks great and fit properly. Everything is good again. Highly recommend.

Would Recommend

Definitely would buy again

5.0

a year ago

Louis

Ky

Verified

Fitment was great. Got me back on the road quickly and w/o issues.

Would Recommend

Yes I would buy again

5.0

a year ago

Louis

Ky

Verified

Great quality. Easy install.

Would Recommend

I bought this product to replace a new one that was defectiv

3.0

a year ago

Tom

Florida

Verified

I had purchased a power steering kit from Speedway a few months ago and the master cylinder was defective. I needed it quick so I just bought it outright because there customer service jerked me around on the last defective item I tried to replace. This one worked.

Would Recommend

Speedwaymotors.com is the best

5.0

a year ago

Bstill

Kalispell MT

Verified

I was both happy and surprised that a defective product bought 2 years ago and out of warranty (it was really only 2 months of use, I just finished the build) was replaced no charge. This is an example of true customer service. Thanks for doing business with integrity.

Would Recommend

Yes, Would Buy this Product again.

5.0

a year ago

Bob

Fargo, ND

Verified

Worked Great ... Out of the Box.

Would Recommend

Solid part

5.0

a year ago

Old Chevy

Scottsdale, AZ

Verified

This master cynlinder is solidly built and works perfect within my 62 Chevy.

Would Recommend

Better than rebuilding old one for sure.

4.0

a year ago

Phil

Illinois

Verified

Great overall functional replacement. Bench bleeding kit , which was included was a plus!

Would Recommend

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Showing 10 of 57 reviews

Questions & Answers

14 Questions • 12 Answers

On a disc/disc application do I need to use a proportioning valve?

by Steve G

• 2 years ago

1 answer

View Answer

With front and rear discs, using the same calipers and pads on all 4 wheels, which port should be used for front and which for rear?

by Albert

• 7 years ago

1 answer

View Answer

I have a 50 pontiac streamliner that I plan on putting this master cylinder in. I plan on using the 10 psi residual value in the front and rear brake lines. Will I need to put in a proportioning valve in either Line ? Also what are the part numbers of the adapters that I will need to get from the master cylinder to the proportioning value. I will also need the adapter for the export end of the residual value to the stock line. Line dia is 3/16 Finally I would like to get a rubber boot to cover the end of the master cylinder since it will sit under the floor of the car.

by Jack

• 7 years ago

1 answer

View Answer

After everything has been bled out what is the correct level of fluid you should have in the master cylinder.

by BigBear

• 9 years ago

3 answers

View Answers

I am on my second master cylinder from your store. I have replaced calipers, brake lines front to rear with premade line, bless lines several times. I have no leaks anywhere. When I let set for about a minute and press the brakes they go to the floor. 2 pumps and I have pressure, can hold and does not move, solid brake. Release pressure for a minute and back to the floor. I have a booster, small one, could this be the problem, I am at wits end with these brakes, disk front and rear, don't know what else to try.

by john

• 11 years ago

1 answer

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Will this master cylinder need a proportioning valve, front disk rear drum?

by Jabo

• 12 years ago

1 answer

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Which port goes to the front bakes?

by 36guy

• 13 years ago

1 answer

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Will stock Ford pushrod work? Does the pushrod thread into the bore? If so, what is the thread pattern?

by AnnabelLee

• 13 years ago

1 answer

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Will this work with a manual disc/disc application? I have heard a residual valve in the master cylinder will not work for disc brakes.

by

• 14 years ago

1 answer

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Would this work with drum/drum early ford brakes?

by

• 15 years ago

1 answer

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