What are Ford GT40 heads?

Ford GT40 Heads
Ford GT40 heads are a type of cylinder head used in high-performance Ford engines. They were first introduced in the 1990s and quickly gained popularity among car enthusiasts for their exceptional performance characteristics. The name “GT40” is a nod to Ford’s legendary GT40 sports car, which dominated the 24 Hours of Le Mans in the 1960s.
Features and Variants
The Ford GT40 heads were most famous for their debut on the 1993 Cobra and were also found on the 1993-1995 Ford SVT Lightning truck. These cylinder heads were a significant improvement over the E7TE cylinder heads that came on most Fox Body Mustangs. They offered better flow and performance compared to the factory E7 heads that were found on most 5.0 Fox Body Mustangs.
There are two variants of the GT40 heads: the GT40 and the GT40P heads. The GT40P heads are a variant of the GT40 cylinder head and are considered to be the best flowing heads that Ford ever produced for the small block Windsor motor. The GT40P heads have one more vertical bar stamped on the side of the head compared to the GT40 heads.
To identify GT40 heads, you can look for a “GT” or “GT40P” stamp inside the head casting or a three-bar (GT40) or four-bar (GT40P) stamp on the side of the head.
Benefits and Availability
GT40 heads are known for their improved flow and performance compared to the E7 heads. They are a popular choice for engine builders and DIY enthusiasts looking to upgrade their Mustang’s cylinder heads without investing in a set of new aluminum heads. However, it has become more difficult to find GT40 heads in good condition as they have become scarcer over time.
Conclusion
In summary, Ford GT40 heads are high-performance cylinder heads used in Ford engines, particularly in Mustangs and other Ford vehicles. They offer improved flow and performance compared to the factory E7 heads and are available in two variants: GT40 and GT40P. GT40 heads are a popular choice for those looking to upgrade their cylinder heads without investing in new aluminum heads .

Are GT40 heads any good?

Yes they are worth it. Be careful with cheap aluminum heads. You probably still have the E7 heads on the engine and they are about the same as the GT40 heads with slightly larger valves and the combustion chambers are about the same size at 64cc also.

How do you identify a Ford GT40 head?

GT40 heads have the 3 bars on the front and GT40P heads have 4 bars. Also if you look at the lower head bolt by the number 1 or 8 cylinder you would see GT for GT40 heads and GTP for GT40P heads cast into the head. E7 heads can only be positively identified by removing the head and flipping it over.

Are gt40p heads aluminum?

They are cast iron. That’s right, the aluminum GT40 heads were/are sold by Ford Racing Parts as aftermarket parts, not installed at the factory. Some(most) of their crate engines are equipped them.

Why are they called GT40 heads?

These heads were first introduced in the 1990s and quickly gained popularity among car enthusiasts for their exceptional performance characteristics. The name GT40 is a nod to Ford’s legendary GT40 sports car, which dominated the 24 Hours of Le Mans in the 1960s.

How many cc is a gt40p head?

The P heads also come with 59cc combustion chambers, which will increase your stock 5.0HO engine compression to about 9.5:1 while the GT40’s 65.5cc chamber hurts your compression dropping it to about 8.8:1.

Are gt40 heads any good?

Yes they are worth it. Be careful with cheap aluminum heads. You probably still have the E7 heads on the engine and they are about the same as the GT40 heads with slightly larger valves and the combustion chambers are about the same size at 64cc also.

Are GT40 heads cast iron?

Improving Your Existing Cylinder Heads
Additionally, either the E7 or the GT40 cylinder heads are going to be made of cast iron. While cast iron is durable, and certainly may account for some of their resiliency, they’re also exceptionally heavy.

How much HP does GT40P heads add?

While we’ve seen engine dyno tests performed with GT-40P heads replacing factory E7TE castings and resulting in a boost of more than 25 hp, we have reluctantly set our horsepower gain goal at 25 ponies, as well. The reason for this is that we’re actually replacing mildly worked E7TE heads.

What was special about the Ford GT40?

With that much power, the GT40 can reach a top speed of 205 mph and accelerate from 0 to 60 mph in just 3.3 seconds. In other words, it was very much ahead of its time.

What is the difference between GT40 and GT40P heads?

GT40 combustion chambers are slightly larger, with volumes ranging from 63-66 cc. The Explorer/Mountaineer heads (GT40P) are somewhat smaller, measured between 58-61cc chamber volume. Thus, GT40P cylinder heads may give a small bump in compression. Finally, the last difference between the two are valves.