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Founder, 1929-2014
Speedy Bill
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Radiator Caps

Browse our wining racing and performance auto parts.

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Radiator Caps
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Radiator Caps

Top off 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!

Street Rod, Radiator Caps

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Featured Products
  • Product Rating: 4.00 Stars
    $9.99
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    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.

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  • No Reviews
    $9.99
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    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

    Go to Product Page
  • Product Rating: 4.50 Stars
    $5.99
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    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

    Go to Product Page
  • Product Rating: 4.00 Stars
    $22.99
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    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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  • No Reviews
    $45.99
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    This vintage style radiator cap from OTB Gear has a similar design to the 1940s Ford farm tractor. It is offered as a 2 part assembly to allow you to properly align it with your radiator.

    • A-356 Aircraft Grade Aluminum
    • 16 lbs. Pressure
    • Made in the USA
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  • Product Rating: 5.00 Stars
    $10.99
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    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.

    Go to Product Page
  • Product Rating: 4.60 Stars
    $9.99
    Quick View Details
    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

    Go to Product Page
  • No Reviews
    $45.99
    Quick View Details
    x
                
    This vintage style radiator cap from OTB Gear has a similar design to the 1940s Ford farm tractor. It is offered as a 2 part assembly to allow you to properly align it with your radiator.
    • A-356 Aircraft Grade Aluminum
    • 7 lbs. Pressure
    • Made in the USA
    Go to Product Page
Product Rating: 4.00 Stars
$29.99
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$9.99
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This part is in stock.
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$12.99 $9.99
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This part is in stock.
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$5.99 $3.99
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This part is in stock.
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Product Rating: 3.50 Stars
$28.99
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Product Rating: 5.00 Stars
$19.99
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This part is in stock.
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$26.99 $19.99
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$75.99
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In Stock
Product Rating: 5.00 Stars
$16.99
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In Stock
Product Rating: 5.00 Stars
$22.99
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$22.99
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$13.99
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Product Rating: 5.00 Stars
$17.99
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This part is in stock.
In Stock
Product Rating: 5.00 Stars
$29.99
In Stock In Stock
This part is in stock.
In Stock
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$26.99 $19.99
In Stock In Stock
This part is in stock.
In Stock
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$17.99
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This part is in stock.
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$45.99
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$50.99
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$39.99
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$58.99 $48.99
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$45.99
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Product Rating: 3.80 Stars
$24.99
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Product Rating: 4.60 Stars
$9.99
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This part is in stock.
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$45.99
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This part is in stock.
In Stock
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$19.99
In Stock In Stock
This part is in stock.
In Stock
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$19.99
Product Rating: 5.00 Stars
$9.99
In Stock In Stock
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In Stock
Product Rating: 3.30 Stars
$33.99
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This part is in stock.
In Stock
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$13.99
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This part is in stock.
In Stock
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$14.99 $5.99
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This part is in stock.
In Stock
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