• Dorman Autograde Concave Steel Cup Expansion Plug 1.25 Inch for Cadillac 1976-1981 550-017
  • Dorman Autograde Concave Steel Cup Expansion Plug 1.25 Inch for Cadillac 1976-1981 550-017
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Dorman - Autograde

Dorman Autograde Concave Steel Cup Expansion Plug 1.25 Inch for Cadillac 1976-1981 550-017

Dorman Autograde Concave Steel Cup Expansion Plug 1.25 Inch for Cadillac 1976-1981 550-017

$15.05
$15.05
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In-stock orders are processed within 48 hours; transit time is additional.

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Returns

Need help with a return? Request authorization within 30 days of delivery for eligible unused, uninstalled items. See details for exclusions and applicable fees.

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Return details & how to start

Request return authorization (RMA) within 30 days of delivery for eligible items. Keep items unused and uninstalled, with original packaging and accessories. Electronics, liquids, special orders and other categories are excluded.

Email sales@frsport.com with RETURN and your order number in the subject to request an RMA. Please wait for return authorization before sending your item back.

Wrong part/size or change of mind: a 20% return processing fee applies, plus applicable shipping costs.

Original shipping is non-refundable. For orders shipped free, the actual outbound shipping cost is deducted from the refund. Return shipping is prepaid by the customer.

After payment capture, cancellations and refunds generally incur a 5% processing fee, except for our error, confirmed defects or confirmed carrier loss. The 5% and 20% fees do not stack; only the greater applicable fee applies. Store credit waives the 5% fee, but applicable return fees remain.

Missing, incorrect or transit-damaged items: report within 3 business days of receipt with photos of the product and packaging.

For defective items, contact us for help with the manufacturer's warranty process. The manufacturer decides the claim.

Concave steel cup expansion plug 1.25 inch diameter for 1976 to 1981 Cadillac engines used to replace leaking or corroded factory cylinder head plugs.

Built to meet the manufacturer's design intent for reliable service, this engine cylinder head plug is constructed from quality steel materials and engineered to match the original part's fit and function for dependable performance.

Key Features

  • Constructed from durable concave steel for long-lasting protection
  • Measures 1.25 inches in diameter with a height of 1.248 inches
  • Designed as a direct-fit replacement for specified General Motors vehicles
  • Engineered to restore proper sealing in the engine cylinder head
  • Backed by over a century of automotive industry experience
  • Validated through testing to ensure consistent quality

Benefits

  • Stops coolant leaks caused by worn or failed expansion plugs
  • Prevents engine overheating and potential damage from fluid loss
  • Ensures a secure fit that matches original equipment specifications
  • Reduces the risk of repeat repairs with trustworthy materials
  • Provides a cost-effective solution for maintaining engine integrity
  • Offers peace of mind with support from US-based product experts

Application

This part is ideal for vehicle owners and mechanics performing engine maintenance or repair on older Cadillac models requiring a reliable seal for the cylinder head. It serves as a critical component for preventing fluid leakage and maintaining proper engine operating temperatures.

Fitment Notes

  • Compatible with select Cadillac models from model years 1976 through 1981
  • Replaces General Motors part number 1489745 and Pioneer part number EP-11
  • Verify vehicle compatibility before purchase to ensure proper fitment

Why Choose Dorman - Autograde?

  • Dorman parts are engineered as direct-fit replacements designed to match OE form, fit, and function for smoother installation
  • Built with quality materials and validated through testing to stand up to daily driving demands
  • Offers a smart way to restore your vehicle with confidence in fit, durability, and dependable performance

What's in the Box

  • 10 Piece Set of Concave Steel Cup Expansion Plugs

Item Dimensions

  • Package measures 3.2 inches by 2.4 inches by 1.5 inches
  • Total package weight is approximately 0.2 lbs
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Vehicle fitment