Since 1952
America's Oldest Speed Shop ®
Speedway Motors Bill Smith
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Products

When you make serious horsepower, you also generate some serious heat. Keep your engine cool with radiators and cooling system components from Speedway Motors. We stock only the best aluminum radiators, water pumps and fans on the market, all at prices that can't be beat. So don't be a victim of overheating and under-performance - beat the heat with cooling parts from Speedway Motors.

"Radiators and Accessories, Radiator Caps" Page 1 of 2

  • High Pressure Radiator Cap, 22-24 Lbs
    High Pressure Radiator Cap, 22-24 Lbs
    x
                

    A must have when racing! High pressure cap for radiators raises boiling point of water.

    Learn more about cooling systems, how to choose the proper pressure cap, and how they work by reading our tech article. Cooling System Principles

  • Round Chrome Radiator Pressure Cap, 15 Lbs
    Round Chrome Radiator Pressure Cap, 15 Lbs
    x
                

    Pressure caps for radiators featuring 15-pound capacity. Chrome finish.

    • 2-3/8" O.D. of cap top
    • 2-1/4" I.D. of cap top
    • Will fit a standard radiator neck
    • Sealing surface (which sits inside the neck) is 1-1/2" O.D.
    • Cap sides are 7/16" tall

    Learn more about cooling systems, how to choose the proper pressure cap, and how they work by reading our tech article. Cooling System Principles

  • Speedway High Pressure Radiator Cap, 29-31 Lbs
    Speedway High Pressure Radiator Cap, 29-31 Lbs
    x
                

    A must have when racing! High pressure cap for radiators raises boiling point of water.

    Learn more about cooling systems, how to choose the proper pressure cap, and how they work by reading our tech article. Cooling System Principles.

  • Hex Chrome Radiator Cap, 15 Lbs
    Hex Chrome Radiator Cap, 15 Lbs
    x
                

    This unique hex style cap for radiators. Available in 15 lb. capacity. Brilliant chrome finish.

    • 2-3/8" O.D. of cap top
    • 2-1/4" I.D. of cap top
    • Will fit a standard radiator neck
    • Sealing surface (which sits inside the neck) is 1-1/2" O.D.
    • Cap sides are 7/16" tall

    Learn more about cooling systems, how to choose the proper pressure cap, and how they work by reading our tech article. Cooling System Principles.

  • Stant 10372 High Pressure Racing Radiator Cap, 21-25 Lbs
    Stant 10372 High Pressure Racing Radiator Cap, 21-25 Lbs
    x
                

    Used by all the top NASCAR teams. The best high pressure radiator caps you can buy!

    Learn more about cooling systems, how to choose the proper pressure cap, and how they work by reading our tech article. Cooling System Principles

  • High Pressure Radiator Cap, 20 Lbs
    High Pressure Radiator Cap, 20 Lbs
    x
                

    A must have when racing! High pressure cap for radiators raises boiling point of water.

    Learn more about cooling systems, how to choose the proper pressure cap, and how they work by reading our tech article. Cooling System Principles

  • Safety Locking Radiator Cap - 28-32 Lbs.
    Safety Locking Radiator Cap - 28-32 Lbs.
    x
                

    This safety lock cap for radiators is designed for high pressure, 28-32 lbs.  Provision to release pressure, taking the danger away from checking your race high pressure system.  High pressure cap raises boiling point of water.

    Learn more about cooling systems, how to choose the proper pressure cap, and how they work by reading our tech article. Cooling System Principles

  • Mr Gasket 2471S Thermocap Radiator Cap, 16 Lb.
    Mr Gasket 2471S Thermocap Radiator Cap, 16 Lb.
    x
                

    How handy is this! The built-in calibrated thermometer on this chrome-plated 16 lb. radiator cap makes it easy to check your coolant temp - and to know when its safe to remove the cap. Fits radiators on most domestic vehicles.

    • Helps to prevent burn injuries
    • Integrated coolant reclamation valve works great with your coolant recovery system
    • Your radiator can reclaim coolant from your overflow bottle
    • Wide 30° to 270° F temperature range
    • Calibrated in centigrade and Fahrenheit
    • Color-coded temperature ranges
    • Chromed crown with a colored trim ring

    Learn more about cooling systems, how to choose the proper pressure cap, and how they work by reading our tech article. Cooling System Principles

  • Stant 10393 High Pressure Racing Radiator Cap, 28-32 Lbs
    Stant 10393 High Pressure Racing Radiator Cap, 28-32 Lbs
    x
                

    Used by all the top NASCAR teams. The best high pressure radiator caps you can buy!

    Learn more about cooling systems, how to choose the proper pressure cap, and how they work by reading our tech article. Cooling System Principles

  • Chrome Radiator Pressure Cap, 7 lbs
    Chrome Radiator Pressure Cap, 7 lbs
    x
                

    Pressure caps for radiators featuring 7-pound capacity. Beautiful, smooth finish in chrome.

    • 2-3/8" O.D. of cap top
    • 2-1/4" I.D. of cap top
    • Will fit a standard radiator neck
    • Sealing surface (which sits inside the neck) is 1-1/2" O.D.
    • Cap sides are 7/16" tall

    Learn more about cooling systems, how to choose the proper pressure cap, and how they work by reading our tech article. Cooling System Principles

  • Garage Sale - 1930-1931 Model A Flying Quail Radiator Cap
    Garage Sale
    Garage Sale - 1930-1931 Model A Flying Quail Radiator Cap
    x
                

    Quality chrome reproductions of the classy add-on all Model A owners want! Includes radiator cap and quail assembly for 1930-1931 Model A's. 

     

    This is garage sale priced because it has some minor scratches.

     

    NO WARRANTY, NO RETURNS ON GARAGE SALE ITEMS   

  • Model T Dog Bone Radiator Cap, Chrome, Drilled
    Model T Dog Bone Radiator Cap, Chrome, Drilled
    x
                These Dog Bone caps are a reproduction of an original aftermarket  accessory that were available during the Model T era. These cast chrome  caps have a hole drilled in them for use with Jr. Moto-Meters and are 6-1/2”  long. The Dog bone style makes removing your radiator cap easier by  giving you a more convenient area to grip and to twist turn the hot cap,  as the  arms are outboard and they cool off in the air. Many people  like using it to add some style to your Model T.

    Model T Dog Bone Radiator Cap

    • Fits 1909-1927 Ford Model T radiators
    • Screws into stock filler necks
    • 6-1/2" long (end to end)
    • Drilled for Motor Meters
    • Chrome finish

    Learn more about cooling systems, how to choose the proper pressure cap, and how they work by reading our tech article. Cooling System Principles

  • Garage Sale - Round Chrome Radiator Pressure Cap, 15 Lbs
    Garage Sale
    Garage Sale - Round Chrome Radiator Pressure Cap, 15 Lbs
    x
                Please view the product's page for more information
            
  • 1930-1931 Ford Model A Radiator Pressure Cap
    1930-1931 Ford Model A Radiator Pressure Cap
    x
                

    These 1930-1931 Ford radiator caps are a quarter-turn twist on and feature a stainless steel finish. These caps will look and fit great on top of your original or custom Model A car or pickup radiator.

    • Quarter-turn twist on
    • Stainless steel finish
    • Smooth, polished top
    • Side grooves for easy grip

    Learn more about cooling systems, how to choose the proper pressure cap, and how they work by reading our tech article. Cooling System Principles

  • Garage Sale - Total Performance Brass Radiator Cap w/Hole
    Garage Sale
    Garage Sale - Total Performance Brass Radiator Cap w/Hole
    x
                These Dog Bone caps are a reproduction of an original aftermarket accessory that were available during the Model T era. These brass caps have a hole drilled in them for use with Jr. Moto-Meters and are 6” long. The Dog bone style makes removing your radiator cap easier by giving you a more convenient area to grip and to twist turn the hot cap, as the arms are outboard and they cool off in the air. Many people like using it to add some style to your Model T.

     

    This is garage sale priced because it has been discontinued.

     

    NO WARRANTY, NO RETURNS ON GARAGE SALE ITEMS 

     

  • AFCO 80094B Black Billet Aluminum Radiator Cap with Logo
    AFCO 80094B Black Billet Aluminum Radiator Cap with Logo
    x
                These quality radiator caps help prevent the loss of coolant that can lead to overheating.
    • 16 lb. radiator cap is made of billet aluminum with black finish
    • Engraved AFCO logo
    • For Street use only

    Learn more about cooling systems, how to choose the proper pressure cap, and how they work by reading our tech article. Cooling System Principles

  • Model T Hex Radiator Cap, Brass, Undrilled
    Model T Hex Radiator Cap, Brass, Undrilled
    x
                Screws into the top of stock Model T filler necks or our repros. Brass.
            
  • Model T Gull Wing Cap, Brass, Undrilled
    Model T Gull Wing Cap, Brass, Undrilled
    x
                

    Graceful, swept-back wing shape adds class and style to any Model T. Screws onto radiator filler neck.*

    *NOTE: Cap does not fit our Model T filler neck 91112221 or 91112220.

    Learn more about cooling systems, how to choose the proper pressure cap, and how they work by reading our tech article. Cooling System Principles.  

  • Hex Brass Radiator Cap, 15 Lbs.
    Hex Brass Radiator Cap, 15 Lbs.
    x
                

    This unique hex style cap for radiators is now available in 15 lb. capacity. Beautiful brass finish.

    • 2-3/8" O.D. of cap top
    • 2-1/4" I.D. of cap top
    • Will fit a standard radiator neck
    • Sealing surface (which sits inside the neck) is 1-1/2" O.D.
    • Cap sides are 7/16" tall

    Learn more about cooling systems, how to choose the proper pressure cap, and how they work by reading our tech article. Cooling System Principles

  • 1928-1929 Ford Model A Radiator Cap
    1928-1929 Ford Model A Radiator Cap
    x
                

    1928-1929 screw on, chrome plated Ford Model A cap for radiators. This cap has internal threads and they measure approximately 2-3/16" inside diameter.

    • Internal threads measure approximately 2-3/16" inside diameter
    • Cap is 2-1/2" outside diameter

    Learn more about cooling systems, how to choose the proper pressure cap, and how they work by reading our tech article. Cooling System Principles

  • Garage Sale - Total Performance Winged Hex Nut, 8 Inch
    Garage Sale
    Garage Sale - Total Performance Winged Hex Nut, 8 Inch
    x
                

    These big feather wings can be added to most Model T caps for radiators that have a moto meter and drilled cap. Measures 8" long and includes drilled chrome hex cap.

     

    This is garage sale priced because it has been discontinued.

     

    NO WARRANTY, NO RETURNS ON GARAGE SALE ITEMS   

  • Model T Dog Bone Radiator Cap, Chrome, Undrilled
    Model T Dog Bone Radiator Cap, Chrome, Undrilled
    x
                

    These Dog Bone caps are a reproduction of an original aftermarket accessory that were available during the Model T era. These cast chrome caps  are 6-1/2” long. The Dog bone style makes removing your radiator cap easier by giving you a more convenient area to grip and to twist turn the hot cap, as the arms are outboard and they cool off in the air. Many people like using it to add some style to your Model T.

    Model T Dog Bone Radiator Cap

    • Fits 1909-1927 Ford Model T radiators
    • Screws into stock filler necks
    • 6-1/2" long (end to end)
    • Undrilled
    • Chrome finish
  • Garage Sale - Mr Gasket Import Thermocap Radiator Cap
    Garage Sale
    Garage Sale - Mr Gasket Import Thermocap Radiator Cap
    x
                
    • Available for import applications only
    • Built-in thermometer indicates coolant temperature
    • Calibrated in Fahrenheit and centigrade
    • 30° to 270° F range
    • Color-coded temperature ranges
    • Integrated coolant reclamation valve
    • Helps prevent coolant burn injuries
    • Chrome crown with colored trim ring
    • Improves appearance under hood

    These caps are garage sale priced because they are different than what we currently offer.

     

    NO WARRANTY, NO RETURNS ON GARAGE SALE ITEMS

     

  • Garage Sale - Model T Gull Wing Undrilled Brass Radiator Cap
    Garage Sale
    Garage Sale - Model T Gull Wing Undrilled Brass Radiator Cap
    x
                

    Graceful, swept-back wing shape adds class and style to any Model T. Screws onto radiator filler neck**. Undrilled version does not accept Motor Meter. Available in Brass

    **NOTE: Cap does not fit our Model T Filler Necks 911-12221, 911-12220, 911-12222.

     

    These caps are garage sale priced because they have some flat spots on the threads and can't be sold as firsts.

     

    NO WARRANTY, NO RETURNS ON GARAGE SALE ITEMS

  • Stant Radiator Cap - 21-25 Lbs
    Stant Radiator Cap - 21-25 Lbs
    x
                

    Quality radiator caps help prevent the loss of coolant that can lead to over heating.

    Learn more about cooling systems, how to choose the proper pressure cap, and how they work by reading our tech article. Cooling System Principles.  

  • AFCO 80094 Billet Aluminum Radiator Cap with Logo
    AFCO 80094 Billet Aluminum Radiator Cap with Logo
    x
                
    • 16 lb. radiator cap is made of billet aluminum and fully polished
    • Engraved AFCO logo
    • For Street use only

    Learn more about cooling systems, how to choose the proper pressure cap, and how they work by reading our tech article. Cooling System Principles

  • Speedway 16 Lb. Thermocap Radiator Cap
    Speedway 16 Lb. Thermocap Radiator Cap
    x
                

    The built-in calibrated thermometer on this chrome-plated 16 lb. radiator cap makes it easy to check your coolant temp - and to know when its safe to remove the cap. Fits radiators on most domestic vehicles.

    • Helps to prevent burn injuries
    • Integrated coolant reclamation valve works great with your coolant recovery system
    • Your radiator can reclaim coolant from your overflow bottle
    • Wide 30° to 270° F temperature range
    • Calibrated in centigrade and Fahrenheit
    • Color-coded temperature ranges
    • Chromed crown with a colored trim ring

    Learn more about cooling systems, how to choose the proper pressure cap, and how they work by reading our tech article. Cooling System Principles

  • Garage Sale - Brass Radiator Pressure Cap
    Garage Sale
    Garage Sale - Brass Radiator Pressure Cap
    x
                

    Pressure caps for radiators featuring 7 or 15-pound capacity. Beautiful, smooth finish in brass.

    • 2-3/8" O.D. of cap top
    • 2-1/4" I.D. of cap top
    • Will fit a standard radiator neck
    • Sealing surface (which sits inside the neck) is 1-1/2" O.D.
    • Cap sides are 7/16" tall

    Learn more about cooling systems, how to choose the proper pressure cap, and how they work by reading our tech article. Cooling System Principles

     

    This cap is garage sale priced because it has some discoloration in the brass. 

     

    NO WARRANTY, NO RETURNS ON GARAGE SALE ITEMS    

  • Garage Sale - Round Chrome Radiator Pressure Cap, 15 Lbs
    Garage Sale
    Garage Sale - Round Chrome Radiator Pressure Cap, 15 Lbs
    x
                Please view the product's page for more information
            
  • 1934 Ford Replacement Radiator Cap, Passenger Car, Chrome
    1934 Ford Replacement Radiator Cap, Passenger Car, Chrome
    x
                

    These are original style replacement radiator caps for 1934 Ford passenger cars. They are not for pressurized cooling systems. These fin styled caps feature a chrome finish and match the hood/radiator chrome trim as expected.

    • OEM replacement
    • 1934 Ford passenger cars
    • Not for pressurized cooling systems
    • Chrome finish
    • Teardrop shape with rib running length of cap
    • 2-7/8” wide, 4” long, and 1-1/8” tall at high point of rib
    • Lock flange extends below cap into neck 1/2”
    • Lock tabs are on inside of neck similar to a gas cap and NOT on the outside as on later cars
    • 2-1/4” sealing surface O.D.  

    Note:  Verify neck style on radiator to obtain correct cap for your application.

     

  • Garage Sale - Total Performance Chrome Hex Radiator Cap
    Garage Sale
    Garage Sale - Total Performance Chrome Hex Radiator Cap
    x
                

    Screws into the top of stock Model T filler necks or our repros. Drilled style accepts motor meters. Chrome.

    Learn more about cooling systems, how to choose the proper pressure cap, and how they work by reading our tech article. Cooling System Principles.  

     

    This is garage sale priced because it has been discontinued.

     

    NO WARRANTY, NO RETURNS ON GARAGE SALE ITEMS   

  • 1933 Ford Replacement Radiator Cap, Passenger Car, Chrome
    1933 Ford Replacement Radiator Cap, Passenger Car, Chrome
    x
                

    These are original style replacement radiator caps for 1933 Ford passenger cars. They are not for pressurized cooling systems. These fin styled caps feature a chrome finish and match the hood/radiator chrome trim as expected.

    • OEM replacement
    • 1933 Ford passenger cars
    • Not for pressurized cooling systems
    • Chrome finish
  • AFCO 80152-16 Billet Aluminum Radiator Cap
    AFCO 80152-16 Billet Aluminum Radiator Cap
    x
                

    This 16 lb. radiator cap is made of billet aluminum and fully polished.

    Learn more about cooling systems, how to choose the proper pressure cap, and how they work by reading our tech article. Cooling System Principles.  

  • Hex Brass Radiator Cap, 7 lbs
    Hex Brass Radiator Cap, 7 lbs
    x
                

    This unique hex style cap for radiators is now available in 7 lb. capacity. Beautiful brass finish.

    • 2-3/8" O.D. of cap top
    • 2-1/4" I.D. of cap top
    • Will fit a standard radiator neck
    • Sealing surface (which sits inside the neck) is 1-1/2" O.D.
    • Cap sides are 7/16" tall

    Learn more about cooling systems, how to choose the proper pressure cap, and how they work by reading our tech article. Cooling System Principles

  • Garage Sale - Round Chrome Radiator Pressure Cap, 15 Lbs
    Garage Sale
    Garage Sale - Round Chrome Radiator Pressure Cap, 15 Lbs
    x
                Please view the product's page for more information
            
  • Garage Sale - AFCO Billet Aluminum Radiator Cap, 16 LB
    Garage Sale
    Garage Sale - AFCO Billet Aluminum Radiator Cap, 16 LB
    x
                

    This 16 lb. radiator cap is made of billet aluminum and fully polished.

     

    This cap is garage sale priced because it has scratches and scuffs on the top. 

     

    NO WARRANTY, NO RETURNS ON GARAGE SALE ITEMS 

  • Garage Sale - Speedway 16 Lb. Thermocap Radiator Cap
    Garage Sale
    Garage Sale - Speedway 16 Lb. Thermocap Radiator Cap
    x
                Please view the product's page for more information
            
  • Garage Sale - Radiator Cap Cover
    $5.99
    $14.99
    Garage Sale
    Garage Sale - Radiator Cap Cover
    x
                

    Radiator Cap Cover

    Outside Dimensions:

    3"x2"

     

    Inside Dimensions:

    2 3/4 x 1 3/4

     

    Clearance!

     

    NO WARRANTY, NO RETURNS ON GARAGE SALE ITEMS

     

  • Model T Gull Wing Cap, Brass, Drilled
    Model T Gull Wing Cap, Brass, Drilled
    x
                

    Graceful, swept-back wing shape adds class and style to any Model T. Screws into filler neck.* Accepts motor meter.

    *NOTE: Cap does not fit our Model T filler neck 91112221 or 91112220.

    Learn more about cooling systems, how to choose the proper pressure cap, and how they work by reading our tech article. Cooling System Principles.  

  • Garage Sale - Chrome 7lb Radiator Caps
    $19.99
    $29.99
    Garage Sale
    Garage Sale - Chrome 7lb Radiator Caps
    x
                Please view the product's page for more information
            
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