Bill Smith
Founder, 1929-2014
Speedy Bill
Since 1952
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Radiator Caps

Radiator Caps

Top of your radiator with a new radiator cap from Speedway Motors! No matter if you're looking for fashion or function, we've got you covered with beautiful chrome, stainless and brass caps, as well as, stock steel caps. We carry radiator caps from the cooler leaders like AFCO, C&R Radiators and Mr Gasket, so you can rest easy knowing you're getting the best cap possible. No matter what pressure rating you need, you can be we'll have it in stock and ready to ship today!

Featured Products
  • Speedway High Pressure Radiator Cap, 29-31 Lbs
    Speedway High Pressure Radiator Cap, 29-31 Lbs
    (Part #91015628)
    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.

  • High Pressure Radiator Cap, 22-24 Lbs
    High Pressure Radiator Cap, 22-24 Lbs
    (Part #91015622)
    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

  • High Pressure Radiator Cap, 20 Lbs
    High Pressure Radiator Cap, 20 Lbs
    (Part #91015620)
    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

  • Stant 10393 High Pressure Racing Radiator Cap, 28-32 Lbs
    Stant 10393 High Pressure Racing Radiator Cap, 28-32 Lbs
    (Part #91015707)
    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

  • Hex Chrome Radiator Cap, 15 Lbs
    Hex Chrome Radiator Cap, 15 Lbs
    (Part #91015606)
    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.

  • Round Chrome Radiator Pressure Cap, 15 Lbs
    Round Chrome Radiator Pressure Cap, 15 Lbs
    (Part #91015602)
    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

  • Safety Locking Radiator Cap - 28-32 Lbs.
    Safety Locking Radiator Cap - 28-32 Lbs.
    (Part #91015728)
    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

  • AFCO High Pressure Radiator Cap: 29-31 lbs.
    AFCO High Pressure Radiator Cap: 29-31 lbs.
    (Part #10680050)
    x
                

    AFCO high pressure radiator cap for 29-31 lbs. The best cap 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

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"Radiators and Accessories, Radiator Caps" Page 1 of 3

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  • Model T Dog Bone Radiator Cap, Chrome, Drilled
    Model T Dog Bone Radiator Cap, Chrome, Drilled
    (Part #91112205)
    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

  • High Pressure Radiator Cap, 22-24 Lbs
    High Pressure Radiator Cap, 22-24 Lbs
    (Part #91015622)
    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

  • Garage Sale - 15 lb Brass Radiator Cap
    Garage Sale
    Garage Sale - 15 lb Brass Radiator Cap
    (Part #820WB15)
    x
                Please view the product's page for more information
            
  • Mr Gasket 2471S Thermocap Radiator Cap, 16 Lb.
    Mr Gasket 2471S Thermocap Radiator Cap, 16 Lb.
    (Part #5502471S)
    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

  • Garage Sale - AFCO 80094B Black Billet Aluminum Radiator Cap with Logo
    Garage Sale
    Garage Sale - AFCO 80094B Black Billet Aluminum Radiator Cap with Logo
    (Part #AUP3616)
    x
                

    This cap is garage sale priced because it has a few chips in the finish. 

     No Warranty, No Returns On Garage Sale Items

    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

  • 1930-1931 Ford Model A Radiator Pressure Cap
    1930-1931 Ford Model A Radiator Pressure Cap
    (Part #91122002)
    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
    (Part #715A255B)
    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
    (Part #10680094B)
    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
    (Part #91112215)
    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
    (Part #91112206)
    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.  

  • Stant 10372 High Pressure Racing Radiator Cap, 21-25 Lbs
    Stant 10372 High Pressure Racing Radiator Cap, 21-25 Lbs
    (Part #91015706)
    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

  • Hex Brass Radiator Cap, 15 Lbs.
    Hex Brass Radiator Cap, 15 Lbs.
    (Part #91015608)
    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
    (Part #91122001)
    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 - Model T Dog Bone Radiator Cap, Chrome, Undrilled
    Garage Sale
    Garage Sale - Model T Dog Bone Radiator Cap, Chrome, Undrilled
    (Part #UP49559)
    x
                

    This cap is garage sale priced because one of the ends is not attached.  What you see is what you get. 

     No Warranty, No Returns On Garage Sale Items

    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 6.27” 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
    • 6.27" long (end to end)
    • Undrilled
    • Chrome finish
  • Model T Dog Bone Radiator Cap, Chrome, Undrilled
    Model T Dog Bone Radiator Cap, Chrome, Undrilled
    (Part #91112204)
    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 6.27” 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
    • 6.27" 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
    (Part #5502472S)
    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

     

  • Stant Radiator Cap - 21-25 Lbs
    Stant Radiator Cap - 21-25 Lbs
    (Part #10680153)
    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
    (Part #10680094)
    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
    (Part #91015616)
    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

  • Round Chrome Radiator Pressure Cap, 15 Lbs
    Round Chrome Radiator Pressure Cap, 15 Lbs
    (Part #91015602)
    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

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