1968 Buick GS 400 Performance Engines

Keep Your 1968 Buick GS 400 in Top Shape with Quality Performance Engines

Whether you’re repairing or upgrading your Performance Engine, using high-quality parts is key to keeping your 1968 Buick GS 400 looking sharp and performing at its best. At Advance Auto Parts we carry a wide selection of dependable options, including Performance Engine Timing Sets and Components, Performance Engine Coolant Thermostats, and Performance Engine Cylinder Head Gaskets. 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 Performance Engines from Trusted Brands

Looking for a reliable Performance Engine? We’ve got you covered with options from brands you know and trust like Competition Cams. For example, Competition Cams Performance Engines start at just $33.99 with an average 4.1 star rating. With over 33 reviews and a solid 4 star average, you can shop with confidence knowing other Buick GS 400 owners approve.

Competitive Prices and Extensive Inventory

The average price for a 1968 Buick GS 400 Performance Engine at Advance Auto Parts is around $212.15, with a range that starts at $7.99 and goes up to $896.99. With 22 options in stock from 4 trusted brands, finding the right fit is easy. Popular picks like High Performance Thermostat, Valve Cover Gasket Set for Buick, and CYL HEAD COMPONENTS start at just $31.99 and offer a great balance of form and function.

Explore Related Parts

While you’re upgrading or replacing your Performance Engine, don’t forget to check out other key components like Performance Air Filters and Performance Fuel Systems. At Advance Auto Parts, we’re here to help you keep your 1968 Buick GS 400 in peak condition, inside and out.

Find Your Specific 1968 Buick GS 400 Performance Engines

Looking for the perfect Performance Engine for your 1968 Buick GS 400? You’re in the right place. Below, you’ll find links to various types of Performance Engines that fit your vehicle. At Advance Auto Parts, we offer only the highest quality OEM and aftermarket Performance Engines, ensuring durability and a precise fit for your Buick GS 400. Whether you’re driving a 1968 model or another popular model year like 1969, we’ve got you covered. Purchasing Performance Engines 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 Performance Engines that fit your vehicle.

Essential 1968 Buick GS 400 Performance Engines

Edelbrock – Performer Intake Manifold for Buick 400-455 V8, Non-EGR, Satin Finish (Part No.2146)

Performer Intake Manifold for Buick 400-455 V8, Non-EGR, Satin Finish

from

$568.99


Product Features:
  • For Idle to 5500 RPM Street-Driven Performance
  • Dual-Plane Low-Rise Intake w/180 deg. Firing Order
  • Patented Runner Design Ensures Broad Torque Curve
  • Excellent Throttle Response and Mid-Range Power
  • 50-State Street Legal if Correct Carburetor Used
  • Will Fit Cold Air Induction Hoods
See More
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Mr. Gasket – High Performance Thermostat (Part No.4365)

High Performance Thermostat

from

$31.99
Mr. Gasket High Performance Thermostats are designed to resist large variations of coolant pressure at high RPM (revolutions per minute). This allows them to fully open at correct temperature consistently regardless of engine RPM. The design also provides the high flow that engines operated a higher RPM need. This thermostat also features a copper/brass construction to further resist corrosion. Mr. Gasket High Performance / High Flow Thermostats are suitable for street, drag race, or oval track applications.

Product Features:
  • Opens At 195 Degrees
  • Designed to Resist Large Variations of Coolant Pressure at High RPM
  • Fully Opens at Correct Temperature Consistently Regardless of Engine RPM
  • For High Performance Street, Drag Race, and Oval Track
  • Copper & Brass Construction – Resists Corrosion
  • High Flow
See More
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Mr. Gasket – High Performance 180 Degree Thermostat for Increased Flow (Part No.4364)

High Performance 180 Degree Thermostat for Increased Flow

from

$29.99
Mr. Gasket High Performance Thermostats are designed to resist large variations of coolant pressure at high RPM (revolutions per minute). This allows them to fully open at correct temperature consistently regardless of engine RPM. The design also provides the high flow that engines operated a higher RPM need. This thermostat also features a copper/brass construction to further resist corrosion. Mr. Gasket High Performance / High Flow Thermostats are suitable for street, drag race, or oval track applications.

Product Features:
  • Opens At 180 Degrees
  • Designed to Resist Large Variations of Coolant Pressure at High RPM
  • Fully Opens at Correct Temperature Consistently Regardless of Engine RPM
  • For High Performance Street, Drag Race, and Oval Track
  • Copper & Brass Construction – Resists Corrosion
  • High Flow
See More

(20 reviews)
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Competition Cams – VALVE SEALS, TEFLON 3/8" 1 ST (Part No.505-16)

VALVE SEALS, TEFLON 3/8" 1 ST

from

$33.99
COMP Cams offers a complete line of valve stem seals, from the umbrella seals to the positive-stop Teflon seal. These seals are a must to keep unwanted oil from entering the combustion chamber through the clearance in the valve guides. The umbrella seal is normally used when a larger-than-stock diameter spring is used, in the case of a double spring, the positive-stop Teflon seal is used. The umbrella seals require no machining, but with the Teflon seal it is necessary to disassemble the heads and machine the top of the guide with a special .530 diameter cutter. Whenever you are planning an engine overhaul or a cam change, don’t forget the valve seals.

Product Features:
  • Work with .530″ guides and 3/8″ valve stem diameter
  • Valve stem oil seals keep unwanted oil from entering the combustion chamber
  • Several different types of valve seals are offered
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(1 reviews)
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FEL-PRO Performance – Performance Cylinder Head Gasket (Part No.1125)

Performance Cylinder Head Gasket

from

$109.99
Fel-Pro Performance Gaskets deliver reliable sealing under grueling racing conditions.

Product Features:
  • PROPRIETARY COATING – Nonstick anti-friction coating seals small surface imperfections
  • NO RETORQUE DESIGN – Steel core helps eliminate the need for retorquing head bolts
  • SUPERIOR SEAL – Precise embossed Printo seal sealing beads at all vital areas to eliminate leak paths
  • STRONG AND DURABLE – Features graphite or reinforced fiber facing material and steel armor for strength and durability
  • DESIGNED FOR IMPERFECT SEALING SURFACES – Engineered and manufactured specifically for the repair environment to help seal imperfect sealing surfaces
See More
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Edelbrock – Valve Cover Gasket Set for Buick (Part No.7546)

Valve Cover Gasket Set for Buick

from

$37.99
The Edelbrock valve cover gaskets #7546?provide excellent sealing integrity and conformability for easy installation. The multi-layer construction has two highly compressible, high rubber content, fiber-reinforced outside layers which are chemically bonde

Product Features:
  • 0.1875 in. Thickness
  • Core-Reinforced-Composite Material
  • For Buick 400-455
  • Set of 2
  • Made In The USA
See More
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Most Popular Performance Engine Timing Sets and Component for 1968 Buick GS 400s

Enhance your 1968 Buick GS 400 with this popular Performance Engine Timing Sets and Component we have in stock, for $70.99.
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Competition Cams – ENGINE TIMING SET (Part No.3217)

ENGINE TIMING SET

from

$70.99
ENGINE TIMING SET
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Best-Selling 1968 Buick GS 400 Performance Engine Coolant Thermostats

Upgrade your GS 400 with one of our 3 best-selling Performance Engine Coolant Thermostats, earning an average 4 stars rating across 32 reviews.
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Mr. Gasket – High Performance 180 Degree Thermostat for Increased Flow (Part No.4364)

High Performance 180 Degree Thermostat for Increased Flow

from

$29.99
Mr. Gasket High Performance Thermostats are designed to resist large variations of coolant pressure at high RPM (revolutions per minute). This allows them to fully open at correct temperature consistently regardless of engine RPM. The design also provides the high flow that engines operated a higher RPM need. This thermostat also features a copper/brass construction to further resist corrosion. Mr. Gasket High Performance / High Flow Thermostats are suitable for street, drag race, or oval track applications.

Product Features:
  • Opens At 180 Degrees
  • Designed to Resist Large Variations of Coolant Pressure at High RPM
  • Fully Opens at Correct Temperature Consistently Regardless of Engine RPM
  • For High Performance Street, Drag Race, and Oval Track
  • Copper & Brass Construction – Resists Corrosion
  • High Flow
See More

(20 reviews)
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Mr. Gasket – High Performance Thermostat – 160 Degree Brass & Copper (Part No.4363)

High Performance Thermostat - 160 Degree Brass & Copper

from

$29.49
Mr. Gasket High Performance Thermostats are designed to resist large variations of coolant pressure at high RPM (revolutions per minute). This allows them to fully open at correct temperature consistently regardless of engine RPM. The design also provides the high flow that engines operated a higher RPM need. This thermostat also features a copper/brass construction to further resist corrosion. Mr. Gasket High Performance / High Flow Thermostats are suitable for street, drag race, or oval track applications.

Product Features:
  • Opens at 160 Degrees
  • Designed to Resist Large Variations of Coolant Pressure at High RPM
  • Fully opens at Correct Temperature Consistently Regardless of engine RPM
  • For High Performance Street, Drag Race, and Oval Track
  • Copper & Brass Construction – Resists Corrosion
  • High Flow
See More

(12 reviews)
View Product

Mr. Gasket – High Performance Thermostat (Part No.4365)

High Performance Thermostat

from

$31.99
Mr. Gasket High Performance Thermostats are designed to resist large variations of coolant pressure at high RPM (revolutions per minute). This allows them to fully open at correct temperature consistently regardless of engine RPM. The design also provides the high flow that engines operated a higher RPM need. This thermostat also features a copper/brass construction to further resist corrosion. Mr. Gasket High Performance / High Flow Thermostats are suitable for street, drag race, or oval track applications.

Product Features:
  • Opens At 195 Degrees
  • Designed to Resist Large Variations of Coolant Pressure at High RPM
  • Fully Opens at Correct Temperature Consistently Regardless of Engine RPM
  • For High Performance Street, Drag Race, and Oval Track
  • Copper & Brass Construction – Resists Corrosion
  • High Flow
See More
View Product

Top-Quality Performance Engine Cylinder Head Gaskets for 1968 Buick GS 400s

Choose a high-quality OEM or aftermarket Performance Engine Cylinder Head Gasket for Buick GS 400s and enjoy top-notch performance from $71.99.
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Edelbrock – Engine Gasket Set (Head / Intake / Exhaust / Valve Cover) for Buick (Part No.7369)

Engine Gasket Set (Head / Intake / Exhaust / Valve Cover) for Buick

from

$130.99
The Edelbrock No. 7369 head gaskets provide the best sealing solution and are matched to Edelbrock cylinder heads for optimal performance. Edelbrock relies on industry leading head gasket manufactures to ensure our head gasket sets will provide the best fit and sealing properties when used with Edelbrock aluminum cylinder heads. Edelbrock head gaskets are manufactured from high-density materials and feature a superior design that performs under pressure and provides a long-lasting seal, without re-torqueing.
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FEL-PRO Performance – Performance Cylinder Head Gasket (Part No.1125)

Performance Cylinder Head Gasket

from

$109.99
Fel-Pro Performance Gaskets deliver reliable sealing under grueling racing conditions.

Product Features:
  • PROPRIETARY COATING – Nonstick anti-friction coating seals small surface imperfections
  • NO RETORQUE DESIGN – Steel core helps eliminate the need for retorquing head bolts
  • SUPERIOR SEAL – Precise embossed Printo seal sealing beads at all vital areas to eliminate leak paths
  • STRONG AND DURABLE – Features graphite or reinforced fiber facing material and steel armor for strength and durability
  • DESIGNED FOR IMPERFECT SEALING SURFACES – Engineered and manufactured specifically for the repair environment to help seal imperfect sealing surfaces
See More
View Product

Edelbrock – GASKETS (Part No.7346)

GASKETS

from

$71.99
GASKETS
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Our Top Pick for a 1968 Buick GS 400 Performance Intake Manifold

Invest in a durable Performance Intake Manifold for your 1968 Buick, knowing you’re getting trusted brands and expert craftsmanship.
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Edelbrock – Performer Intake Manifold for Buick 400-455 V8, Non-EGR, Satin Finish (Part No.2146)

Performer Intake Manifold for Buick 400-455 V8, Non-EGR, Satin Finish

from

$568.99


Product Features:
  • For Idle to 5500 RPM Street-Driven Performance
  • Dual-Plane Low-Rise Intake w/180 deg. Firing Order
  • Patented Runner Design Ensures Broad Torque Curve
  • Excellent Throttle Response and Mid-Range Power
  • 50-State Street Legal if Correct Carburetor Used
  • Will Fit Cold Air Induction Hoods
See More
View Product

Our Performance Engine Valve Cover Gasket Sets for 1968 Buick GS 400s

Make a smart move for your 1968 Buick GS 400 with our Performance Engine Valve Cover Gasket Set for $37.99.
show more show less

Edelbrock – Valve Cover Gasket Set for Buick (Part No.7546)

Valve Cover Gasket Set for Buick

from

$37.99
The Edelbrock valve cover gaskets #7546?provide excellent sealing integrity and conformability for easy installation. The multi-layer construction has two highly compressible, high rubber content, fiber-reinforced outside layers which are chemically bonde

Product Features:
  • 0.1875 in. Thickness
  • Core-Reinforced-Composite Material
  • For Buick 400-455
  • Set of 2
  • Made In The USA
See More
View Product

Top-Rated Performance Engine Brands For Your 1968 Buick GS 400

When it comes to finding the perfect Performance Engine for your 1968 Buick GS 400, Advance Auto Parts has you covered with a wide selection of high-quality OEM and aftermarket options from 4 trusted brands. We carry the most popular Performance Engine brands including Competition Cams, and more, all known for their exceptional customer ratings (average brand rating of 4.1 stars) and competitive prices, as low as $33.99. Purchasing a Performance Engine from us here at Advance Auto Parts is a smart move for both you and your 1968 Buick GS 400, providing peace of mind with parts that meet or exceed OEM standards.

Popular Competition Cams 1968 Buick GS 400 Performance Engines

If you’re looking for a top-quality Performance Engine for your 1968 Buick GS 400, Advance Auto Parts has exactly what you need with our selection of Competition Cams Performance Engines. We have 1 Competition Cams Performance Engines in stock for this fitment, all known for their durability and precision fit. With prices starting at just $33.99, you’ll find the perfect Performance Engine for your needs and budget. Competition Cams Performance Engines for the 1968 Buick GS 400 come highly rated, with over 1 customer reviews and an impressive average rating of 4.1 stars. Choosing a Competition Cams Performance Engine from Advance Auto Parts is a smart move to ensure quality and value for your vehicle.
VALVE SEALS, TEFLON 3/8" 1 ST
from $33.99
(1)
VALVE SEALS, TEFLON 3/8" 1 ST
“As good as OEM.”

FAQs for 1968 Buick GS 400 Performance Engines

What are the best-selling Performance Engines for 1968 Buick GS 400s?

Out of 22 Performance Engines that fit 1968 Buick GS 400s, the following parts are the top sellers:

What’s the price range for 1968 Buick GS 400 Performance Engines?

The prices of Performance Engines for the 1968 Buick GS 400 range from $7.99 up to $896.99 for the most premium parts.

What is the average price of a Performance Engine for a 1968 Buick GS 400?

The average price for Performance Engines for the 1968 Buick GS 400 is $212.15. Keep in mind the variety of part types within our Performance Engine category, where you are likely to find a wide range of prices across a variety of parts and components.

What are the cheapest Performance Engines for my 1968 Buick GS 400?

The cheapest 1968 Buick GS 400 Performance Engines we carry are:

Does Advance Auto Parts sell Performance Engines for any other 1968 Buick models?

Yes. We stock Performance Engines for 7 other popular 1968 Buick models. Some of the most popular are 1968 LeSabre Performance Engines, 1968 Skylark Performance Engines, 1968 Riviera Performance Engines, 1968 Electra Performance Engines, and 1968 Special Performance Engines.

What are the top-rated Performance Engines that fit the 1968 Buick GS 400?

The one 1968 Buick GS 400 Performance Engine we have in stock is the High Energy 9.378" Long, 5/16" Diameter Pushrod. It costs $7.99.

What types of Performance Engines do you sell for my 1968 Buick GS 400?

As of 11/2/25, these are some of the most in-demand types of Performance Engines for a 1968 Buick GS 400:

Can I get help with 1968 Buick GS 400 Performance Engine orders?

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

What is your return policy for Buick GS 400 Performance Engines?

Advance Auto Parts keeps returns simple. For new Buick GS 400 Performance Engines and accessories, your online orders can be returned, in their original condition, within 45 days. For requirements, see the returns page.

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