• Dorman Autograde Steel Cup Engine Expansion Plug 1-15/16 In for Buick Roadmaster Special Super 555-040
  • Dorman Autograde Steel Cup Engine Expansion Plug 1-15/16 In for Buick Roadmaster Special Super 555-040
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Dorman - Autograde

Dorman Autograde Steel Cup Engine Expansion Plug 1-15/16 In for Buick Roadmaster Special Super 555-040

Dorman Autograde Steel Cup Engine Expansion Plug 1-15/16 In for Buick Roadmaster Special Super 555-040

$28.58
$28.58
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271 in stock

Shipping & returns

Shipping details

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

International orders include export processing and customs clearance. Duties, taxes and brokerage are extra; final freight charges may change after remeasurement.

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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.

Specifications

Product details shared across all variants.

Product type
Engine Expansion Plug
Category
Motor Vehicle Engine Parts
Item condition
New
Manufacturer type
Aftermarket
Shipping weight
1.0 lb
Barcode
019495555407

Billable shipping weight; may include dimensional weight.

Steel cup engine expansion plug for 1950-1953 Buick Roadmaster Special and Super models used to replace worn or leaking factory core plugs.

Built to meet the manufacturer's design intent for reliable service using quality steel materials engineered for durable performance in demanding engine environments.

Key Features

  • Constructed from durable steel for long-lasting reliability
  • Precise diameter of 1-15/16 inches with 0.530 inch height
  • Direct replacement for original equipment specifications
  • Validated through testing to ensure proper fit and function
  • Compatible with General Motors part number 1339404
  • Sold as a 10-piece pack for multiple replacements

Benefits

  • Restores engine sealing to prevent coolant or oil leaks
  • Reduces the risk of repeat repairs with robust construction
  • Ensures smoother installation with OE-matching dimensions
  • Helps maintain proper engine operating temperatures
  • Provides cost-effective solution compared to dealer parts
  • Backed by over a century of automotive expertise

Application

Ideal for classic car restorations and maintenance on vintage Buick vehicles requiring precise engine block sealing components.

Fitment Notes

  • Fits 1950-1952 Buick Super
  • Fits 1951-1953 Buick Special
  • Fits 1951-1952 Buick Roadmaster
  • Verify engine block measurements before installation

Why Choose Dorman - Autograde?

  • Dorman parts are engineered as direct-fit replacements designed to match OE form fit and function
  • Built with quality materials and validated through testing to stand up to daily driving demands
  • Supported by a team of product experts in the United States

What's in the Box

  • 10 Piece set of steel cup expansion plugs

Item Dimensions

  • Package Length: 4.9 inches
  • Package Width: 3.7 inches
  • Package Height: 2.2 inches
  • Weight: 0.9 lbs
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Vehicle fitment