Product Summary

Universal Fit, 9" Outside Diameter, 3.75" Rod Length

  • 9" Delco Style w/ Short Thread Dual Diaphragm Power Brake Booster
  • Exact copy of Delco with Short Threaded Rod
  • Black finish
  • 3.75" Length rod
  • GM 3-3/8" square firewall bolt pattern
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Key Specs

MFG. Part #91664080
BrandSpeedway Motors
Outside Diameter9"
ColorBlack
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Need To Know

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Speedway Motors 91664080 Details

Massive stopping power and a look you can't ignore. This 9" Delco Style Power Brake Booster will have you stopping on a dime. GM 3"-3/8 bolt pattern on the back should bolt right up to your firewall. Will need pedal rod extensions to make it truly universal. Sold separately.

GM 9" Dual Power Brake Booster

  • 9" Delco Style w/ Short Thread Dual Diaphragm Power Brake Booster
  • Exact copy of Delco with Short Threaded Rod
  • Black Finish
  • 3.75" Length Rod
  • GM 3-3/8" Sqauare Firewall Bolt Pattern

Works as an universal power brake booster when purchased with universal pedal rod PRE5564 (910-31520) & PRE6772-18 clevis.

Speedway Motors 91664080 Specifications

KEY SPECS
MFG. Part #91664080
BrandSpeedway Motors
Outside Diameter9"
ColorBlack
GENERAL
Bolt Hole Pattern3-3/8" Square
Rod Length3.75"
Brake Booster TypeVacuum Diaphragm Dual
Sold in QuantityEach

Ratings & Reviews

4.8

8 Reviews

Overall Assessment

Customers favorably reviewed the product, with consistent emphasis on its effectiveness in improving vehicle stopping power. Being a reliable upgrade from 7" single diaphragm boosters, users noted its superior performance in various car models, from 49' suburbans to 1956 Chevy pickups. While some minor fitting modifications were noted, the consensus is that the product's quality, usability, and significant safety enhancement outweighed these small adjustments. Comparatively, customers found our brake booster to work beyond expectations, often opting for repeat purchases due to its reliable, high performance.

4.8

8 reviews

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Works good

4.0

a year ago

Rusty

Missouri

Verified

I needed to do some modifications to bracket on truck, but seems to work well, stops a whole lot better than the dead booster it replaced!

Would Recommend

yes

5.0

a year ago

Speed Racer

Port Reading NJ

Verified

very close match to what i originally had

Would Recommend

YES

5.0

2 years ago

Mr Chevrolet

WI

Verified

Was packaged Very well. Great part

Would Recommend

Truck stops much better now

5.0

2 years ago

Tom

Floyd,VA

Verified

I bought this to replace a 7" single diaphragm booster that was on my 49' suburban. Truck actually stops now. Bolt pattern was the same. It was well packaged as well.

Would Recommend

Fit with some modification

4.0

3 years ago

JR

Kansas

Verified

This possibly provided too much stopping power. The booster workers better that expected. Only negative was the bolt pattern was just slightly bigger and the studs were about 1/4 - 3/8" shorter causing some modifications to be needed. Once bolted up... No issues what so ever. Super fast shipping. Thanks Speedway!

Would Recommend

Great product

5.0

5 years ago

Flip

Stockton, ca

Verified

Fit perfect in my 1968 Camaro

Great product and great service

5.0

6 years ago

Tom

Rutherford NJ

Verified

Needed a booster for my 56 Ford panel truck thanks to speedway I got the product that I needed!

Would Recommend

I would buy this product again.

5.0

6 years ago

Terry

Bloomfield, IN

Verified

I used this to replace a leaking booster on my 1956 chevy pickup and it worked great.

Would Recommend

Showing 8 of 8 reviews

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