1978 Mercury Cougar Engine Internals

Name: Sealed Power Engine Piston, WH418CP
Brand: Sealed Power
SKU: WH418CP
Price: 46.49 USD

Please Select your Vehicle to See Exact Fit Parts

Keep Your 1978 Mercury Cougar in Top Shape with Quality Engine Internals

Whether you’re repairing or upgrading your Engine Internal, using high-quality parts is key to keeping your 1978 Mercury Cougar looking sharp and performing at its best. At Advance Auto Parts we carry a wide selection of dependable options, including Standard Piston Rings, Standard Rod Bearing Sets, and Crankshaft Seals. Whether you’re replacing a damaged part or enhancing your truck’s style and protection, you’ll find exactly what you need to get the job done right.

Top-Rated Engine Internals from Trusted Brands

Looking for a reliable Engine Internal? We’ve got you covered with options from brands you know and trust like Sealed Power. For example, Sealed Power Engine Internals start at just $5.49 with an average 4.4 star rating. With over 50 reviews and a solid 3.7 star average, you can shop with confidence knowing other Mercury Cougar owners approve.

Competitive Prices and Extensive Inventory

The average price for a 1978 Mercury Cougar Engine Internal at Advance Auto Parts is around $63.09, with a range that starts at $5.19 and goes up to $324.99. With 75 options in stock from 8 trusted brands, finding the right fit is easy. Popular picks like Sealed Power Engine Connecting Rod Bearing, 2600CP, Felpro Engine Crankshaft Seal Kit, BS 40042, and Sealed Power Engine Piston Ring Set, E-251K start at just $6.59 and offer a great balance of form and function.

Explore Related Parts

While you’re upgrading or replacing your Engine Internal, don’t forget to check out other key components like Engine Gaskets and Seals and Engine Timing Parts. At Advance Auto Parts, we’re here to help you keep your 1978 Mercury Cougar in peak condition, inside and out.

Looking for the perfect Engine Internal for your 1978 Mercury Cougar? You’re in the right place. Below, you’ll find links to various types of Engine Internals that fit your vehicle. At Advance Auto Parts, we offer only the highest quality OEM and aftermarket Engine Internals, ensuring durability and a precise fit for your Mercury Cougar. Whether you’re driving a 1978 model or another popular model year like 1993, 1994, 1995, 1996, 1997, 1999, 2000, 2001, and 2002, we’ve got you covered. Purchasing Engine Internals from Advance Auto Parts is a smart choice, giving you access to trusted brands and parts built to perform. Below, you’ll find links to various types of Engine Internals that fit your vehicle.

Essential 1978 Mercury Cougar Engine Internals

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$46.49

Sealed Power® parts provide innovative designs, use leading edge materials and utilize ISO & QS certified manufacturing in order to deliver top quality products that meet the rigorous demands of today’s modern engines.

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$41.99

Sealed Power Engine Connecting Rod Bearing, 3360CPA 20

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$18.29

Sealed Power Engine Connecting Rod Bearing, 3545A .25MM

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$6.99

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$324.99

Remanufactured precision machined OE crankshafts.

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$85.99

Speed-Pro delivers the power you need and the value and quality that you deserve. Whether you are running at the track, chasing trophies on the strip, or just cruising down the road, count on Speed-Pro to provide the best value in HP engine components

Sealed Power Engine Crankshaft Main Bearing Set, 7292MA .25MM

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$86.99

Sealed Power Engine Piston Set, 8KH273CP 30

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$286.99

Sealed Power Engine Piston Ring Set, E-261X

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$97.99

Sealed Power® Vintage components provide coverage for applications over 35 years old, restoring classics with like new performance. Leading edge materials, ISO & QS certified manufacturing ensures performance and longevity for treasured engine rebuilds.

Sealed Power Engine Piston Ring Set, E-296K 30

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$111.99

Sealed Power Engine Connecting Rod Bearing Set, 8-3360CPA 20

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$50.99

Sealed Power Engine Connecting Rod Bearing Set, 8-2600A 10

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$64.99

Sealed Power Engine Crankshaft Main Bearing Set, 7295MA

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$101.99

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$71.99

Sealed Power Engine Piston Ring Set, E-180K 60

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$90.99

Sealed Power Engine Piston Ring Set, E-219K 40

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$63.99

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$44.99

National has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.

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$31.49

Sealed Power Engine Connecting Rod Bearing Set, 8-1985A

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$76.99

Sealed Power Engine Connecting Rod Bearing Set, 8-3380A 40

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$58.99

Driveworks Main Bearing Repair Sleeve, S-99181

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$43.49

Driveworks Main Bearing Repair Sleeve, S-99181.

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$34.49

"ARP Auto Racing For Use With 289/ 460 Cubic"" Ford, 5/8"" Socket Size, 5/8"" - 18 Thread Size, 150-2501"

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$38.99

As the crankshaft flexes and twists, the balancer absorbs incredible amounts of kinetic energy. To ensure that the balancer is locked in position, ARP has developed these ultra strong 200,000 Pounds Per Square Inch bolts that let you exert maximum clamping force. Special features comes with 1/4 Inch thick, wide area washer and an extra tall 12 point head that accepts a deep socket and eliminates the worry of stripping the head.

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$19.99

This engine harmonic balancer bolt is designed to match the fit and function of the original part on specified vehicles. Made of quality materials, it is engineered for reliable performance.

Sealed Power Engine Connecting Rod Bearing, 4395A .25MM

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$8.89

Sealed Power Engine Connecting Rod Bearing, 3380A 10

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$6.29

Sealed Power Engine Connecting Rod Bearing, 3360CPA 10

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$19.49

Sealed Power Engine Connecting Rod Bearing, 3380CPA 10

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$15.79

Popular 1978 Mercury Cougar Engine Internals Categories

Crankshaft Seals

Crankshaft Bolts

Remanufactured Crankshaft

Main Bearing Repair Sleeves

Piston and Liners

Oversized Main Bearings

Standard Rod Bearing Sets

Main Bearings

Standard Piston Rings

Standard Individual Rod Bearings

Oversized Piston Rings

Oversized Rod Bearing Set

Oversized Individual Rod Bearing

Oversized Piston Sets

Most Popular Standard Piston Rings for 1978 Mercury Cougars

Enhance your 1978 Mercury Cougar with one of the 13 Standard Piston Rings we have in stock, starting at just $22.49.

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Sealed Power Engine Piston Ring Set, E-251K 40

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$91.99

Sealed Power Engine Piston Ring Set, E-251K

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$107.99

Sealed Power Engine Piston Ring Set, E-251K 30

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$125.99

Sealed Power Engine Piston Ring Set, E-251X

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$89.99

Sealed Power Engine Piston Ring Set, E-251X 40

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$59.99

Sealed Power Engine Piston Ring Set, WE-251K

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$22.49

Sealed Power Engine Piston Ring Set, E-251KC 30

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$99.99

Sealed Power Engine Piston Ring Set, E-251K 60

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$91.99

Sealed Power Engine Piston Ring Set, E-251KC

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$71.99

Sealed Power Premium Piston Ring Set, R-9903 30

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$202.99

Sealed Power Engine Piston Ring Set, E-251KC 40

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$69.99

Sealed Power Engine Piston Ring Set, E-251K 10

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$67.99

Sealed Power Engine Piston Ring Set, E-251X 20

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$59.99

Best-Selling 1978 Mercury Cougar Standard Rod Bearing Sets

Upgrade your Cougar with one of our 8 best-selling Standard Rod Bearing Sets, earning an average 5 stars rating across 3 reviews.

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Sealed Power Engine Connecting Rod Bearing Set, 8-2600A

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$66.99

Sealed Power Engine Connecting Rod Bearing Set, 8-2600CP

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$62.99

Sealed Power Engine Connecting Rod Bearing Set, 8-3380CPA

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$61.99

Sealed Power Connecting Rod Bearing Set, 8-7160CH

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$95.99

Sealed Power Engine Connecting Rod Bearing Set, 8-3400CP

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$48.49

Sealed Power Engine Connecting Rod Bearing Set, 8-3380CPA 20

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$66.99

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$58.99

Sealed Power Engine Connecting Rod Bearing Set, 8-2600A 40

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$32.99

Top-Quality Crankshaft Seals for 1978 Mercury Cougars

Choose a high-quality OEM or aftermarket Crankshaft Seal for Mercury Cougars and enjoy top-notch performance from $16.99.

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Felpro Engine Crankshaft Seal Kit, BS 40042

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$16.99

Fel-Pro® gaskets are specifically designed for the repair environment to deliver a reliable seal on even the most troublesome applications. Designed for imperfect sealing surfaces and manufactured with proprietary materials, you can count on Fel-Pro for innovative sealing solutions for the real-world repair environment.

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$44.99

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$33.99

Victor Reinz Engine Crankshaft Seal Kit, 19-10156-01

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$21.99

With Victor Reinz gaskets, you can be sure you are getting sealing solutions that deliver OE quality gasket technology and engineering. That is because Victor Reinz is an original equipment supplier and the trusted choice of manufacturers the world over, offering broad coverage for foreign and domestic cars and trucks. In Victor Reinz gasket sets, you get the right combination of components needed for fast, long-lasting repairs.

Victor Reinz Engine Crankshaft Seal Kit, 19-10149-01

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$20.99

Top Picks for 1978 Mercury Cougar Standard Individual Rod Bearings

Invest in one of our 8 durable Standard Individual Rod Bearings for your 1978 Mercury, knowing you’re getting trusted brands and expert craftsmanship.

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Sealed Power Engine Connecting Rod Bearing, 2600CP 10

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$5.49

Sealed Power Engine Connecting Rod Bearing, 2600CP

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$6.59

Sealed Power Engine Connecting Rod Bearing, 3400CP

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$7.49

Sealed Power Engine Connecting Rod Bearing, 2600CP 20

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$5.79

Sealed Power Engine Connecting Rod Bearing, 2600A

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$5.19

Sealed Power Engine Connecting Rod Bearing, 3380CPA

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$16.29

Sealed Power Engine Connecting Rod Bearing, 3400CP 20

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$5.79

Sealed Power Engine Connecting Rod Bearing, 2600A 10

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$5.19

Our Crankshaft Bolts for 1978 Mercury Cougars

Make a smart move for your 1978 Mercury Cougar with our Crankshaft Bolt for $38.99.

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$38.99

Top-Rated Engine Internal Brands For Your 1978 Mercury Cougar

When it comes to finding the perfect Engine Internal for your 1978 Mercury Cougar, Advance Auto Parts has you covered with a wide selection of high-quality OEM and aftermarket options from 8 trusted brands. We carry the most popular Engine Internal brands including Sealed Power, and more, all known for their exceptional customer ratings (average brand rating of 4.4 stars) and competitive prices, as low as $5.49. Purchasing a Engine Internal from us here at Advance Auto Parts is a smart move for both you and your 1978 Mercury Cougar, providing peace of mind with parts that meet or exceed OEM standards.

Popular Sealed Power 1978 Mercury Cougar Engine Internals

If you’re looking for a top-quality Engine Internal for your 1978 Mercury Cougar, Advance Auto Parts has exactly what you need with our selection of Sealed Power Engine Internals. We have 3 Sealed Power Engine Internals in stock for this fitment, all known for their durability and precision fit. With prices starting at just $5.49 and an average cost of $45.16, you’ll find the perfect Engine Internal for your needs and budget. Sealed Power Engine Internals for the 1978 Mercury Cougar come highly rated, with over 4 customer reviews and an impressive average rating of 4.4 stars. Choosing a Sealed Power Engine Internal from Advance Auto Parts is a smart move to ensure quality and value for your vehicle.

from $66.99

(1)

Sealed Power Engine Connecting Rod Bearing Set, 8-2600A

“Exact fit and right part”

from $62.99

(2)

Sealed Power Engine Connecting Rod Bearing Set, 8-2600CP

“these bearings were the exact fit and just what i needed”

from $5.49

(1)

Sealed Power Engine Connecting Rod Bearing, 2600CP 10

“arrived quickly, exactly what I ordered”

FAQs for 1978 Mercury Cougar Engine Internals

What are the best-selling Engine Internals for 1978 Mercury Cougars?

Out of 75 Engine Internals that fit 1978 Mercury Cougars, the following parts are the top sellers:

Sealed Power Engine Connecting Rod Bearing, 2600CP (3695077) – $6.59
Felpro Engine Crankshaft Seal Kit, BS 40042 (5183073) – $16.99
Sealed Power Engine Piston Ring Set, E-251K (5688000) – $107.99

What’s the price range for 1978 Mercury Cougar Engine Internals?

The prices of Engine Internals for the 1978 Mercury Cougar range from $5.19 up to $324.99 for the most premium parts.

What is the average price of an Engine Internal for a 1978 Mercury Cougar?

The average price for Engine Internals for the 1978 Mercury Cougar is $63.09. Keep in mind the variety of part types within our Engine Internal category, where you are likely to find a wide range of prices across a variety of parts and components.

Does Advance Auto Parts sell Engine Internals for other Mercury Cougar model years?

Yes, we carry Engine Internals for 33 model years of Mercury Cougars between 1967 and 2002. The following model years are the most popular for Engine Internal purchases: 2002, 2001, 2000, 1999, 1997, 1996, 1995, 1994, and 1993.

What are the cheapest Engine Internals for my 1978 Mercury Cougar?

The cheapest 1978 Mercury Cougar Engine Internals we carry are:

Sealed Power Engine Connecting Rod Bearing, 2600A (20686376) – $5.19
Sealed Power Engine Connecting Rod Bearing, 2600A 10 (20686377) – $5.19
Sealed Power Engine Connecting Rod Bearing, 2600CP 10 (3695085) – $5.49
Sealed Power Engine Connecting Rod Bearing, 3400CP 30 (3701131) – $5.59
Sealed Power Engine Connecting Rod Bearing, 2600CP 20 (3704572) – $5.79

Does Advance Auto Parts sell Engine Internals for any other 1978 Mercury models?

Yes. We stock Engine Internals for 4 other popular 1978 Mercury models. Some of the most popular are 1978 Grand Marquis Engine Internals, 1978 Zephyr Engine Internals, 1978 Marquis Engine Internals, 1978 Monarch Engine Internals, and 1978 Bobcat Engine Internals.

What are the top-rated Engine Internals that fit the 1978 Mercury Cougar?

The one 1978 Mercury Cougar Engine Internal we have in stock is the Sealed Power Engine Connecting Rod Bearing, 2600A. It costs $5.19.

What types of Engine Internals do you sell for my 1978 Mercury Cougar?

As of 8/2/26, these are some of the most in-demand types of Engine Internals for a 1978 Mercury Cougar:

Can I get help with 1978 Mercury Cougar Engine Internal orders?

Contact our customer support team by chat or phone, through the help desk page, where you can find instant answers about Mercury Engine Internals and more.

What is your return policy for Mercury Cougar Engine Internals?

Advance Auto Parts keeps returns simple. For new Mercury Cougar Engine Internals and accessories, your online orders can be returned, in their original condition, within 45 days. For requirements, see the returns page.

1978 Mercury Cougar Engine Internals

Sealed Power – Sealed Power Engine Piston, WH418CP (Part No.WH418CP)

Sealed Power – Sealed Power Engine Piston, WH820CP (Part No.WH820CP)

Sealed Power – Sealed Power Engine Connecting Rod Bearing, 3360CPA 20 (Part No.3360CPA 20)

Sealed Power – Sealed Power Engine Connecting Rod Bearing, 3545A .25MM (Part No.3545A .25MM)

Crankshaft Rebuilders – Crankshaft Rebuilders Remanufactured Crankshaft Kit, 15570 (Part No.15570)

Sealed Power – Sealed Power Main Bearing Set, 134M 10 (Part No.134M 10)

Sealed Power – Sealed Power Engine Crankshaft Main Bearing Set, 7292MA .25MM (Part No.7292MA .25MM)

Sealed Power – Sealed Power Engine Piston Set, 8KH273CP 30 (Part No.8KH273CP 30)

Sealed Power – Sealed Power Engine Piston Ring Set, E-261X (Part No.E-261X)

Sealed Power – Sealed Power Engine Piston Ring Set, E-296K 30 (Part No.E-296K 30)

Sealed Power – Sealed Power Engine Connecting Rod Bearing Set, 8-3360CPA 20 (Part No.8-3360CPA 20)

Sealed Power – Sealed Power Engine Connecting Rod Bearing Set, 8-2600A 10 (Part No.8-2600A 10)

Sealed Power – Sealed Power Engine Crankshaft Main Bearing Set, 7295MA (Part No.7295MA)

Sealed Power – Sealed Power Main Bearing Set, 130M (Part No.130M)

Sealed Power – Sealed Power Engine Piston Ring Set, E-180K 60 (Part No.E-180K 60)

Sealed Power – Sealed Power Engine Piston Ring Set, E-219K 40 (Part No.E-219K 40)

National – National Engine Crankshaft Seal, 5117 (Part No.5117)

National – National Engine Crankshaft Seal, 3909 (Part No.3909)

Sealed Power – Sealed Power Engine Connecting Rod Bearing Set, 8-1985A (Part No.8-1985A)

Sealed Power – Sealed Power Engine Connecting Rod Bearing Set, 8-3380A 40 (Part No.8-3380A 40)

Driveworks – Driveworks Main Bearing Repair Sleeve, S-99181 (Part No.S-99181)

National – National Shaft Repair Sleeve, 99196 (Part No.99196)

ARP Auto Racing – "ARP Auto Racing For Use With 289/ 460 Cubic"" Ford, 5/8"" Socket Size, 5/8"" – 18 Thread Size, 150-2501" (Part No.150-2501)

Dorman – Dorman Harmonic Balancer Bolt, 926-886 (Part No.926-886)

Sealed Power – Sealed Power Engine Connecting Rod Bearing, 4395A .25MM (Part No.4395A .25MM)

Sealed Power – Sealed Power Engine Connecting Rod Bearing, 3380A 10 (Part No.3380A 10)

Sealed Power – Sealed Power Engine Connecting Rod Bearing, 3360CPA 10 (Part No.3360CPA 10)

Sealed Power – Sealed Power Engine Connecting Rod Bearing, 3380CPA 10 (Part No.3380CPA 10)

Sealed Power – Sealed Power Engine Piston Ring Set, E-251K 40 (Part No.E-251K 40)

Sealed Power – Sealed Power Engine Piston Ring Set, E-251K (Part No.E-251K)

Sealed Power – Sealed Power Engine Piston Ring Set, E-251K 30 (Part No.E-251K 30)

Sealed Power – Sealed Power Engine Piston Ring Set, E-251X (Part No.E-251X)

Sealed Power – Sealed Power Engine Piston Ring Set, E-251X 40 (Part No.E-251X 40)

Sealed Power – Sealed Power Engine Piston Ring Set, WE-251K (Part No.WE-251K)

Sealed Power – Sealed Power Engine Piston Ring Set, E-251KC 30 (Part No.E-251KC 30)

Sealed Power – Sealed Power Engine Piston Ring Set, E-251K 60 (Part No.E-251K 60)

Sealed Power – Sealed Power Engine Piston Ring Set, E-251KC (Part No.E-251KC)

Sealed Power – Sealed Power Premium Piston Ring Set, R-9903 30 (Part No.R-9903 30)

Sealed Power – Sealed Power Engine Piston Ring Set, E-251KC 40 (Part No.E-251KC 40)

Sealed Power – Sealed Power Engine Piston Ring Set, E-251K 10 (Part No.E-251K 10)

Sealed Power – Sealed Power Engine Piston Ring Set, E-251X 20 (Part No.E-251X 20)

Sealed Power – Sealed Power Engine Connecting Rod Bearing Set, 8-2600A (Part No.8-2600A)

Sealed Power – Sealed Power Engine Connecting Rod Bearing Set, 8-2600CP (Part No.8-2600CP)

Sealed Power – Sealed Power Engine Connecting Rod Bearing Set, 8-3380CPA (Part No.8-3380CPA)

Sealed Power – Sealed Power Connecting Rod Bearing Set, 8-7160CH (Part No.8-7160CH)

Sealed Power – Sealed Power Engine Connecting Rod Bearing Set, 8-3400CP (Part No.8-3400CP)

Sealed Power – Sealed Power Engine Connecting Rod Bearing Set, 8-3380CPA 20 (Part No.8-3380CPA 20)

Sealed Power – Sealed Power Engine Connecting Rod Bearing Set, 8-3380A 40 (Part No.8-3380A 40)

Sealed Power – Sealed Power Engine Connecting Rod Bearing Set, 8-2600A 40 (Part No.8-2600A 40)

Felpro – Felpro Engine Crankshaft Seal Kit, BS 40042 (Part No.BS 40042)

National – National Engine Crankshaft Seal, 5117 (Part No.5117)

National – National Engine Crankshaft Seal, 5108 (Part No.5108)

Victor Reinz – Victor Reinz Engine Crankshaft Seal Kit, 19-10156-01 (Part No.19-10156-01)

Victor Reinz – Victor Reinz Engine Crankshaft Seal Kit, 19-10149-01 (Part No.19-10149-01)

Sealed Power – Sealed Power Engine Connecting Rod Bearing, 2600CP 10 (Part No.2600CP 10)

Sealed Power – Sealed Power Engine Connecting Rod Bearing, 2600CP (Part No.2600CP)

Sealed Power – Sealed Power Engine Connecting Rod Bearing, 3400CP (Part No.3400CP)

Sealed Power – Sealed Power Engine Connecting Rod Bearing, 2600CP 20 (Part No.2600CP 20)

Sealed Power – Sealed Power Engine Connecting Rod Bearing, 2600A (Part No.2600A)

Sealed Power – Sealed Power Engine Connecting Rod Bearing, 3380CPA (Part No.3380CPA)

Sealed Power – Sealed Power Engine Connecting Rod Bearing, 3400CP 20 (Part No.3400CP 20)

Sealed Power – Sealed Power Engine Connecting Rod Bearing, 2600A 10 (Part No.2600A 10)

ARP Auto Racing – "ARP Auto Racing For Use With 289/ 460 Cubic"" Ford, 5/8"" Socket Size, 5/8"" – 18 Thread Size, 150-2501" (Part No.150-2501)