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Bill Smith
Founder, 1929-2014
Speedy Bill
Since 1952
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America's Oldest Speed Shop ®

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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!

Classic Truck, Radiator Caps

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Featured Products
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    $39.99
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    This vintage style finned radiator cap from OTB Gear.  The top is cast in A-356 aircraft grade aluminum and polished to show quality standards.  The internal radiator cap is a Stant Corp. quality product.   It is offered as a 2 part assembly to allow you to properly align it with other finned items on your engine.
    • A-356 Aircraft Grade Aluminum
    • 16 lbs. Pressure
    • Made in the USA
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  • 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
  • No Reviews
    $45.99
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    This sprocket radiator cap from OTB Gear is precision machined from high quality aluminum alloy and polished. This stylish designed cap is made in the USA.

    • Cast in aircraft grade aluminum
    • Polished to show quality standards
    • Dress off the top of your radiator
    • Made in the USA
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  • 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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  • 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
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    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
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$9.99
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$12.99 $9.99
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$5.99 $3.99
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Product Rating: 3.50 Stars
$28.99
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$26.99 $19.99
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$75.99
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$22.99
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Product Rating: 5.00 Stars
$13.99
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$26.99 $19.99
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Product Rating: 3.00 Stars
$17.99
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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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$45.99
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Product Rating: 5.00 Stars
$9.99
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Product Rating: 3.30 Stars
$33.99
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$13.99
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$14.99 $5.99
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$29.99 $19.99
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Product Rating: 4.00 Stars
$9.99
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$10.99 $6.99
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Product Rating: 5.00 Stars
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Product Rating: 2.70 Stars
$10.99
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$75.99 $49.99
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Product Rating: 4.00 Stars
$22.99
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