http://www.modmotortech.com/forums/showthread.php?t=295 said:Navigator: (98+ Lincoln Navigator)
These 5.4L DOHC heads feature essentially the same intake port design as C heads, however they have a much larger intake port volume than 4.6L castings. Despite the fact these heads feature a relatively small exhaust port, the extra intake port volume could be very beneficial in helping fill a motor of greater displacement—think 5.4L. Expect slightly better midrange torque, and sub 8000rpm horsepower production than even C heads, however the larger intake port size leaves a slim selection of intakes to choose from when utilized on a 4.6L block. Forced induction fans take note, Navigator exhaust ports feature a thicker exhaust divider (while keeping the same overall exhaust port size as B,C, and FR500 heads) that allows coolant to circulate through this vital area. Conversely however, the larger divider can also hurt flow by utilizing additional space in the port.
The real downside to Navigator heads, when used on a 4.6L based motor, is the severe limitation they impose on intake selection. The physically larger 5.4L heads don’t leave a lot of room (when installed on a 4.6L block) between them for an intake plenum to sit—though they do bolt right up. Remember that since Navigator intake ports are essentially clones of those of C heads (just on a larger scale), they too suffer from the same intake port flaws that plague the earlier tumble port design--no short turn or floor in the throat of the intake port.
The Bottom Line: The extra port volume the Navi’s possess could be very beneficial in filling a motor with greater than 281 cubic inches of displacement, or in high rpm N/A street/strip or boosted combinations. Fans of boost should remember the cooled exhaust port divider. Lack of intake availability is the real downfall of this otherwise wonderful casting.
Stock Intake Choices: None (4.6L), 98+ Navigator (5.4L)
Aftermarket/Modified Stock Intake Choices: Al Papitto short runner 99 Cobra (4.6L), sheet metal
Navigator head dimensions: Combustion Chamber: 53cc, Intake Port Vol.: 184cc, Intake Port Entrance: 2.290”x1.400”, Valves: 37mm Int., 30mm Exh.
Its the Aviator not the Nav.Yeah, love the Navigator motor, great heads and should be a great project.
Hope this writeup on their 4v heads helps.
Aviator’s engine delivers peak power of 302 horsepower at 5,750 rpm and peak torque of 300 lbs.-ft. at 3,250 rpm; 90 percent of peak torque is available at only 2,000 rpm. It meets the California Air Resources Board’s Ultra Low Emission Vehicle (ULEV) standard.
The Aviator team began with a new, very rigid aluminum block that weighs 70 pounds less than a comparable iron block. It is fitted it with 10.03:1 high-compression pistons for good power and fuel economy, and upgraded connecting rods for durability. New aluminum four-valve heads and an aluminum intake manifold with variable-length runners optimize airflow at all engine speeds to improve low-speed tractability and high-rpm power with greatly reduced combustion noise.
LOW RPM
HIGH RPM
Often, engine designers use aggressive intake port tuning for a high degree of tumble in the intake charge to achieve quick and powerful combustion for good torque at low engine speeds. Two disadvantages of this approach are increased noise at high engine speeds and reduced peak power. But Aviator uses an internal valve to switch from a long intake path at low engine speeds to a short intake path at high speeds. The long path produces a column of air that helps promote better cylinder filling for more torque and better low-end response than a traditional intake. When the manifold switches to the short-path configuration, the engine breathes more freely to maximize peak power.
Aviator engineers took other actions to reduce the engines sound levels during development. For example, the rigid deep-skirt block has six-bolt main bearing caps and a lower architecture that limits bolt forces to the vertical direction, which improves overall stiffness and reduces noise. New computer-engineered engine mounts not only lessen the transmission of noise and vibration to the chassis but also are tuned to use the engine as a mass damper for better ride comfort.
Other noise-fighting features include very stiff accessory mounts, roller-finger cam followers, dual fuel rail dampers and a thicker front engine cover. A molded engine shroud further reduces sound levels, but Aviator engine design engineer Rob McWilliams notes, “We found that by carefully studying noise sources and making subtle changes, we could deliver impressive refinement throughout the power band without having to resort to aggressive sound-blanketing techniques.”
Its the Aviator not the Nav.
Its the 4.6 version and yeah its more like a Mach motor with the 6 bolt crank. Definatly worth it. I assume this is for the 04? If so you can use the computer you have and just reflash it for the engine. For your car it will be a pretty easy drop in. IDK if the block is aluminum though. I doubt it, prolly the iron block
Looks like somebody here needs glasses.
IDK what site it was. I was searching for "Aviator engine" pics and it came up
As far as the porting you may wana hit up hotmustang331 as he ported his himself
9psi might be too much for it. IDK for sure though. My wana get a bigger pully and run 6 psiits an 04 aviator. as far as boost. i was just going to run the termi blower stock and call it good. maybe a pulley.
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