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

  • 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

  • Chrome Radiator Pressure Cap, 7 lbs
    Chrome Radiator Pressure Cap, 7 lbs
    (Part #91015601)
    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

  • 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

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"Muscle Car, Radiator Caps" Page 1 of 2

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  • 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 - 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 

     

  • 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

  • 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

     

  • 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

  • Chrome Radiator Pressure Cap, 7 lbs
    Chrome Radiator Pressure Cap, 7 lbs
    (Part #91015601)
    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

  • AFCO 80152-16 Billet Aluminum Radiator Cap
    AFCO 80152-16 Billet Aluminum Radiator Cap
    (Part #1068015216)
    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.  

  • Garage Sale - AFCO Billet Aluminum Radiator Cap, 16 LB
    Garage Sale
    Garage Sale - AFCO Billet Aluminum Radiator Cap, 16 LB
    (Part #UP28523)
    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 - Radiator Cap Cover
    $5.99
    $14.99
    Garage Sale
    Garage Sale - Radiator Cap Cover
    (Part #91122001.GS)
    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

     

  • 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

  • Garage Sale - Chrome 7lb Radiator Caps
    $19.99
    $29.99
    Garage Sale
    Garage Sale - Chrome 7lb Radiator Caps
    (Part #715WC7)
    x
                Please view the product's page for more information
            
  • 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.

  • Garage Sale - Chrome Radiator Cap, 14 Lbs.
    Garage Sale
    Garage Sale - Chrome Radiator Cap, 14 Lbs.
    (Part #91015602.GS)
    x
                

    Clearance!!

     

    **NO WARRANTY, NO RETURNS ON GARAGE SALE ITEMS**

     

    14 lb chrome radiator cap.  See photos for application. 

  • Garage Sale - Total Performance Brass T Radiator Cap
    Garage Sale
    Garage Sale - Total Performance Brass T Radiator Cap
    (Part #715A254B)
    x
                

    Same as stock 1909-1915 Model T. Has four fins or "ears". Screws into all stock Model T filler necks. Brass only.

     

    This is garage sale priced because it has been discontinued.

     

    NO WARRANTY, NO RETURNS ON GARAGE SALE ITEMS   

  • 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 #AUP3689)
    x
                

    This radiator cap is garage sale priced because it has some scratches 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

  • 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

  • Garage Sale - Total Performance 15 Lbs Brass Radiator Caps
    Garage Sale
    Garage Sale - Total Performance 15 Lbs Brass Radiator Caps
    (Part #715WB15)
    x
                

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

     

    This is garage sale priced because it has been discontinued.

     

    NO WARRANTY, NO RETURNS ON GARAGE SALE ITEMS   

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