1966 AMC Ambassador Performance Engines

Keep Your 1966 AMC Ambassador 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 1966 AMC Ambassador looking sharp and performing at its best. At Advance Auto Parts we carry a wide selection of dependable options, including Performance Engine Valve Springs, Performance Engine Timing Sets and Components, and Performance Engine Coolant Thermostats. 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 65 reviews and a solid 4 star average, you can shop with confidence knowing other AMC Ambassador owners approve.

Competitive Prices and Extensive Inventory

The average price for a 1966 AMC Ambassador Performance Engine at Advance Auto Parts is around $206.17, with a range that starts at $7.99 and goes up to $933.99. With 37 options in stock from 2 trusted brands, finding the right fit is easy. Popular picks like High Performance Thermostat, ENGINE ROCKER ARM, and ENGINE ROCKER ARM start at just $27.99 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 Distributors and Performance Fuel Systems. At Advance Auto Parts, we’re here to help you keep your 1966 AMC Ambassador in peak condition, inside and out.

Find Your Specific 1966 AMC Ambassador Performance Engines

Looking for the perfect Performance Engine for your 1966 AMC Ambassador? 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 AMC Ambassador. Whether you’re driving a 1966 model or another popular model year like 1958, 1967, 1968, 1969, 1970, 1971, 1972, 1973, and 1974, 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 1966 AMC Ambassador Performance Engines

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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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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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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Edelbrock – Pushrod Set for AMC 343-401 (Part No.9637)

Pushrod Set for AMC 343-401

from

$217.99
Product Features:
  • Case-Hardened Tubing
  • Surface Hardening
  • Welded Ends
  • 0.3125 in. Diameter
  • Use with or without Hardened Steel Guideplates
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Most Popular Performance Engine Valve Springs for 1966 AMC Ambassadors

Enhance your 1966 AMC Ambassador with one of the 2 Performance Engine Valve Springs we have in stock, starting at just $12.99.
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Competition Cams – Engine Valve Spring Kit (Part No.940-16)

Engine Valve Spring Kit

from

$111.99
Engine Valve Spring Kit
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Competition Cams – Engine Valve Spring (Part No.940-1)

Engine Valve Spring

from

$12.99
Engine Valve Spring
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Best-Selling 1966 AMC Ambassador Performance Engine Timing Sets and Components

Upgrade your Ambassador with one of our 3 best-selling Performance Engine Timing Sets and Components.
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Competition Cams – ENGINE TIMING SET (Part No.2118)

ENGINE TIMING SET

from

$129.99
ENGINE TIMING SET
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Competition Cams – ENGINE TIMING SET (Part No.3218)

ENGINE TIMING SET

from

$65.99
ENGINE TIMING SET
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Competition Cams – ENGINE TIMING SET (Part No.3219)

ENGINE TIMING SET

from

$64.99
ENGINE TIMING SET
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Top-Quality Performance Engine Coolant Thermostats for 1966 AMC Ambassadors

Choose a high-quality OEM or aftermarket Performance Engine Coolant Thermostat for AMC Ambassadors and enjoy top-notch performance from $29.49.
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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 Picks for 1966 AMC Ambassador Performance Engine Rocker Arms

Invest in one of our 8 durable Performance Engine Rocker Arms for your 1966 AMC, knowing you’re getting trusted brands and expert craftsmanship.
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Competition Cams – ENGINE ROCKER ARM (Part No.1832-16)

ENGINE ROCKER ARM

from

$649.99
ENGINE ROCKER ARM
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Competition Cams – Magnum Rocker Arm and Pushrod Kit for AMC 290-401 (Part No.RPM1410-16)

Magnum Rocker Arm and Pushrod Kit for AMC 290-401

from

$517.99
Magnum Rocker Arm and Pushrod Kit for AMC 290-401
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Competition Cams – ENGINE ROCKER ARM (Part No.17044-16)

ENGINE ROCKER ARM

from

$277.99
ENGINE ROCKER ARM
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Competition Cams – ENGINE ROCKER ARM (Part No.1442-16)

ENGINE ROCKER ARM

from

$241.99
ENGINE ROCKER ARM
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Competition Cams – HIGH ENRGY ALUM ROCK (Part No.17044-8)

HIGH ENRGY ALUM ROCK

from

$148.99
HIGH ENRGY ALUM ROCK
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Competition Cams – ENGINE ROCKER ARM (Part No.1832-1)

ENGINE ROCKER ARM

from

$61.99
ENGINE ROCKER ARM
View Product

Competition Cams – ENGINE ROCKER ARM (Part No.1442-1)

ENGINE ROCKER ARM

from

$31.99
ENGINE ROCKER ARM
View Product

Competition Cams – ENGINE ROCKER ARM (Part No.17044-1)

ENGINE ROCKER ARM

from

$27.99
ENGINE ROCKER ARM
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Our Top-Rated Performance Engine Valve Stem Seal Sets for 1966 AMC Ambassadors

Make a smart move for your 1966 AMC Ambassador with our Performance Engine Valve Stem Seal Set for $33.99.
show more show less

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)
View Product

Top-Rated Performance Engine Brands For Your 1966 AMC Ambassador

When it comes to finding the perfect Performance Engine for your 1966 AMC Ambassador, 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 1966 AMC Ambassador, providing peace of mind with parts that meet or exceed OEM standards.

Popular Competition Cams 1966 AMC Ambassador Performance Engines

If you’re looking for a top-quality Performance Engine for your 1966 AMC Ambassador, 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 1966 AMC Ambassador 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 1966 AMC Ambassador Performance Engines

What are the best-selling Performance Engines for 1966 AMC Ambassadors?

Out of 37 Performance Engines that fit 1966 AMC Ambassadors, the following parts are the top sellers:

What’s the price range for 1966 AMC Ambassador Performance Engines?

The prices of Performance Engines for the 1966 AMC Ambassador range from $7.99 up to $933.99 for the most premium parts.

What is the average price of a Performance Engine for a 1966 AMC Ambassador?

The average price for Performance Engines for the 1966 AMC Ambassador is $206.17. 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.

Does Advance Auto Parts sell Performance Engines for other AMC Ambassador model years?

Yes, we carry Performance Engines for 15 model years of AMC Ambassadors between 1958 and 1974. The following model years are the most popular for Performance Engine purchases: 1974, 1973, 1972, 1971, 1970, 1969, 1968, 1967, and 1958.

What are the cheapest Performance Engines for my 1966 AMC Ambassador?

The cheapest 1966 AMC Ambassador Performance Engines we carry are:

Does Advance Auto Parts sell Performance Engines for any other 1966 AMC models?

Yes. We stock Performance Engines for 2 other popular 1966 AMC models. Some of the most popular are 1966 Marlin Performance Engines, 1966 American Performance Engines, and 1966 Classic Performance Engines.

What are the top-rated Performance Engines that fit the 1966 AMC Ambassador?

The one 1966 AMC Ambassador Performance Engine we have in stock is the High Energy 7.794" Long, 5/16" Diameter Pushrod. It costs $7.99.

What types of Performance Engines do you sell for my 1966 AMC Ambassador?

As of 11/2/25, these are some of the most in-demand types of Performance Engines for a 1966 AMC Ambassador:

Can I get help with 1966 AMC Ambassador Performance Engine orders?

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

What is your return policy for AMC Ambassador Performance Engines?

Advance Auto Parts keeps returns simple. For new AMC Ambassador 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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