1968 Buick GS 350 Performance Engines

Keep Your 1968 Buick GS 350 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 350 looking sharp and performing at its best. At Advance Auto Parts we carry a wide selection of dependable options, including Performance Engine Valve Stem Seal Sets, Performance Engine Coolant Thermostats, and Performance Engine Valve Springs. 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 34 reviews and a solid 4 star average, you can shop with confidence knowing other Buick GS 350 owners approve.

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 350 in peak condition, inside and out.

Find Your Specific 1968 Buick GS 350 Performance Engines

Looking for the perfect Performance Engine for your 1968 Buick GS 350? 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 350. 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 350 Performance Engines

Competition Cams – VALVE SPRINGS, 1.437" SINGLE 1 ST (Part No.942-16)

VALVE SPRINGS, 1.437" SINGLE 1 ST

from

$257.99
Single Outer Valve Springs from COMP Cams allow you to build the perfect spring assembly for your application. The valve spring creation process is far more involved than most people realize. Selecting the right metal stock and creating the best design is not done by chance. COMP Cams has developed a process that creates the highest quality valve spring available. The result is a product that meets and exceeds the expectations of today’s engine builders and racers.

Product Features:
  • Seat pressure: 115 lbs. @ 1.700″, Open Pressure: 284 lbs. @ 1.200″
  • O.D.: 1.437″, I.D.: 1.039″
  • Single valve springs with damper
  • Approximately .510″ max lift at recommended installed height
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(1 reviews)
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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 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)
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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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Most Popular Performance Engine Valve Stem Seal Set for 1968 Buick GS 350s

Enhance your 1968 Buick GS 350 with this popular Performance Engine Valve Stem Seal Set we have in stock, for $33.99.
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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
See More

(1 reviews)
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Best-Selling 1968 Buick GS 350 Performance Engine Coolant Thermostats

Upgrade your GS 350 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)
View Product

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 Valve Springs for 1968 Buick GS 350s

Choose a high-quality OEM or aftermarket Performance Engine Valve Spring for Buick GS 350s and enjoy top-notch performance from $12.99.
show more show less

Competition Cams – VALVE SPRINGS, 1.437" SINGLE 1 ST (Part No.942-16)

VALVE SPRINGS, 1.437" SINGLE 1 ST

from

$257.99
Single Outer Valve Springs from COMP Cams allow you to build the perfect spring assembly for your application. The valve spring creation process is far more involved than most people realize. Selecting the right metal stock and creating the best design is not done by chance. COMP Cams has developed a process that creates the highest quality valve spring available. The result is a product that meets and exceeds the expectations of today’s engine builders and racers.

Product Features:
  • Seat pressure: 115 lbs. @ 1.700″, Open Pressure: 284 lbs. @ 1.200″
  • O.D.: 1.437″, I.D.: 1.039″
  • Single valve springs with damper
  • Approximately .510″ max lift at recommended installed height
See More

(1 reviews)
View Product

Competition Cams – Engine Valve Spring Kit (Part No.910-16)

Engine Valve Spring Kit

from

$166.99
Engine Valve Spring Kit
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Competition Cams – Engine Valve Spring (Part No.910-1)

Engine Valve Spring

from

$12.99
Engine Valve Spring
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Top Picks for 1968 Buick GS 350 Performance Engine Camshafts

Invest in one of our 5 durable Performance Engine Camshafts for your 1968 Buick, knowing you’re getting trusted brands and expert craftsmanship.
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Competition Cams – High Energy 212/212 Hydraulic Flat Cam for Buick 350 (Part No.92-202-4)

High Energy 212/212 Hydraulic Flat Cam for Buick 350

from

$525.99
High Energy 212/212 Hydraulic Flat Cam for Buick 350
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Competition Cams – High Energy 218/218 Hydraulic Flat Cam for Buick 350 (Part No.92-203-4)

High Energy 218/218 Hydraulic Flat Cam for Buick 350

from

$525.99
High Energy 218/218 Hydraulic Flat Cam for Buick 350
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Competition Cams – Thumpr 227/241 Hydraulic Flat Cam for Buick 350 (Part No.92-600-5)

Thumpr 227/241 Hydraulic Flat Cam for Buick 350

from

$519.99
Thumpr 227/241 Hydraulic Flat Cam for Buick 350
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Competition Cams – Big Mutha’ Thumpr 227/241 Hydraulic Flat Cam for Buick 350 (Part No.92-602-5)

Big Mutha' Thumpr 227/241 Hydraulic Flat Cam for Buick 350

from

$508.99
Big Mutha’ Thumpr 227/241 Hydraulic Flat Cam for Buick 350
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Competition Cams – Mutha’ Thumpr 227/241 Hydraulic Flat Cam for Buick 350 (Part No.92-601-5)

Mutha' Thumpr 227/241 Hydraulic Flat Cam for Buick 350

from

$494.99
Mutha’ Thumpr 227/241 Hydraulic Flat Cam for Buick 350
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Our Performance Engine Timing Sets and Components for 1968 Buick GS 350s

Make a smart move for your 1968 Buick GS 350 with our Performance Engine Timing Sets and Component for $49.99.
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Competition Cams – ENGINE TIMING SET (Part No.3215)

ENGINE TIMING SET

from

$49.99
ENGINE TIMING SET
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Top-Rated Performance Engine Brands For Your 1968 Buick GS 350

When it comes to finding the perfect Performance Engine for your 1968 Buick GS 350, Advance Auto Parts has you covered with a wide selection of high-quality OEM and aftermarket options from 2 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 350, providing peace of mind with parts that meet or exceed OEM standards.

Popular Competition Cams 1968 Buick GS 350 Performance Engines

If you’re looking for a top-quality Performance Engine for your 1968 Buick GS 350, Advance Auto Parts has exactly what you need with our selection of Competition Cams Performance Engines. We have 2 Competition Cams Performance Engines in stock for this fitment, all known for their durability and precision fit. With prices starting at just $33.99 and an average cost of $145.99, you’ll find the perfect Performance Engine for your needs and budget. Competition Cams Performance Engines for the 1968 Buick GS 350 come highly rated, with over 2 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.”
VALVE SPRINGS, 1.437" SINGLE 1 ST
from $257.99
(1)
VALVE SPRINGS, 1.437" SINGLE 1 ST
“Great price”

FAQs for 1968 Buick GS 350 Performance Engines

What are the best-selling Performance Engines for 1968 Buick GS 350s?

Out of 22 Performance Engines that fit 1968 Buick GS 350s, the following parts are the top sellers:

What’s the price range for 1968 Buick GS 350 Performance Engines?

The prices of Performance Engines for the 1968 Buick GS 350 range from $7.99 up to $855.99 for the most premium parts.

What is the average price of a Performance Engine for a 1968 Buick GS 350?

The average price for Performance Engines for the 1968 Buick GS 350 is $229.79. 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 350?

The cheapest 1968 Buick GS 350 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 350?

The one 1968 Buick GS 350 Performance Engine we have in stock is the High Energy 9.668" Long, 5/16" Diameter Pushrod. It costs $7.99.

What types of Performance Engines do you sell for my 1968 Buick GS 350?

As of 11/2/25, these are some of the most in-demand types of Performance Engines for a 1968 Buick GS 350:

Can I get help with 1968 Buick GS 350 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 350 Performance Engines?

Advance Auto Parts keeps returns simple. For new Buick GS 350 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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