Motor Gurus #2 Question

[lastdaze04]

I understand that there are many 4 valve heads from ford.

1. Do they all flow about the same? or are the ones issued for our MM better than the others.:confused:
2. The cam selection from Ford are they all pretty much the same or is there one that is better than the other?:confused:

3. I heard that our cars have the Navigator cams, is that true?:confused:

All this info not only helps me but helps all the other noob's that fequent the site.
Thanks in advance
Rick

[FordNut]

Our heads are the same as '03-'04 Cobra, about the best production heads you can get.

[Loco1234]

They are also the same as the MACH 1.

The following is to my uderstanding:
I believe our heads use either the exhaust or intake valve from the pre 2002 navigator.
In 2002 and after the navigator used i different set of cams. I've heard using the Intake cam from the Post 2002 navigator and the Exhaust Cam from the stock supercharged 2003 Mustang Cobra is a slight improvement over the stock marauder setup.

[Bobmiddle]

I my be wrong but I thought there were other Heads options for our cars:confused:

[sailsmen]

I my be wrong but I thought there were other Heads options for our cars:confused:

The Marauder only ame with one head design.

There was a fix to a problem. Ohter than that they are all the same.

[FordNut]

I my be wrong but I thought there were other Heads options for our cars:confused:

Not for our cars, but there have been several versions of 4V heads.

The '93-'98 heads had two intake ports per cylinder with a intake runner control setup for one of the ports.

The '99-'01 heads had a single intake port like ours, but the ports and chambers were different. They are referred to as tumble-port heads.

The '03-'04 heads are all the same for Cobra, Marauder, Mach 1, Aviator.

I understand the 5.4 4V Navigator heads have some differences, not sure of the details.

The FR500 heads are the best, but they weren't available on a production vehicle.

I believe there was another version, can't remember what it was.

[MarauderTJA]

Our heads are the same as '03-'04 Cobra, about the best production heads you can get.

DITTO.....:up:

[magindat]

They are also the same as the MACH 1.

The following is to my uderstanding:
I believe our heads use either the exhaust or intake valve from the pre 2002 navigator.
In 2002 and after the navigator used i different set of cams. I've heard using the Intake cam from the Post 2002 navigator and the Exhaust Cam from the stock supercharged 2003 Mustang Cobra is a slight improvement over the stock marauder setup.

I seem to remember Dennis Reinhart saying he had navigator exhaust cam. I wonder if this is what he meant.

[Loco1234]

I seem to remember Dennis Reinhart saying he had navigator exhaust cam. I wonder if this is what he meant.

Ya I had discussed changing out the cam on my marauder when i got the Fox Lake stage III head work done. but decided it would make too little of an improvement and for the tradeoff of slope idler in my daily driver. Someday Ill get a set of custom cams.

It possible i got which cam came from the navigator and which one came for the Cobra backwards... Its been a while... (intake or exhaust)

[Zack]

Buy the Ford GT cams, they are $450 and have .475 lift.
Smooth idle and kick ass power with a blower.

(coming soon to a garage near me)

[hidperf]

Buy the Ford GT cams, they are $450 and have .475 lift.
Smooth idle and kick ass power with a blower.

(coming soon to a garage near me)

Zack, you ever see any dyno results with these cams N/A? I think I read a thread on them on the MachI site but I'm not sure they had N/A dyno results. The reason I'm asking, I was thinking of throwing these in before I put a blower on. I can get them CHEAP.

[MarauderTJA]

Also look at Comp Cams XE274BH-116 LI & LE if you are looking for an SC cams. I have them in my car now, love them.

[Zack]

Zack, you ever see any dyno results with these cams N/A? I think I read a thread on them on the MachI site but I'm not sure they had N/A dyno results. The reason I'm asking, I was thinking of throwing these in before I put a blower on. I can get them CHEAP.

I wouldnt put a cam in unless you are on an all out quest for MAX power.
I ran 11.60 with 10psi (Vortech) on a bone stock motor.
Second, a cam swap in the car in just not smart, you will regret it!
to answer your question, I dont have any dyno results, but look at the Twin Turbo GT's making 1000+hp with relatively low boost levels. The cams DO have something to do with that :up:


Also look at Comp Cams XE274BH-116 LI & LE if you are looking for an SC cams. I have them in my car now, love them.

Do they Lope?

[99SVT]

The Navigator heads have much larger ports but they don't have any 4.6L intakes that will fit them.

The other heads are the 2000 Cobra R and the Ford GT which are very similar and like the Navi, don't have any intake choices. The R and GT heads are more of a high port head and flow better than any of the other offerings. The Aussies also have a similar head in their Falcon GT, not exactly something you'll find in North America, though.

[Loco1234]

GO TO: http://www.sullivanperformance.com/YVS450/tech/tech1.htm
or read information below... both are the same informative information regarding the performance of Modular Motors.

Cylinder Heads

4.6L DOHC
There are several different castings available for the DOHC heads. 4.6L & 5.4L heads will physically interchange, but the ports on the 5.4L heads are much bigger than the 4.6L heads. Neither the Cobra or Lincoln intake manifolds will work with this swap. If you were able to get the intake to bolt on, there still is not enough material around the ports to enable port matching to the larger navigator heads. Our single plane 4.6L intakes were designed with enough material to allow for this swap. The Navigator heads ports are too big for a naturally aspirated 4.6L street car but may make for some impressive horsepower on forced induction cars.

These heads can be divided into 2 basic designs pre-1999 twin port heads (also known as the "B" head) and post-1999 tumble port heads (also known as the "C" head). These 2 heads are interchangeable on any of the 4.6L blocks although it is usually not financially feasible to do this swap because it entails swapping intake manifolds as well. Both heads are very good castings with the tumble port heads getting the nod for making more high end horsepower. The heads on the Lincoln are the same castings as are used on the Cobra.

If you are building your DOHC engine for use in a truck or heavy car, you will probably be happier with the twin port heads. These heads with their IMRC plates, create better torque and at a lower RPM than the tumble port heads without severely limiting hi-end horsepower. These heads respond well to a port and polish job. You can also pick up extra horsepower if your engine is a Lincoln, by swapping the intake manifold for an early Mustang Cobra intake.

The tumble port heads have been available since 1999. These heads were never offered on the Lincoln Mark series due to the cancellation of this model in 1998. These heads can be found on the front wheel drive Lincoln Continental. Maybe if you come across a cheap Continental engine it's not such a bad deal after all. Obviously these heads are also available on the Mustang Cobra. The Cobra heads were modified for 2003. They are supposed to flow better on the intake and exhaust than the early castings.
The best heads offered to date have never been installed on a production vehicle. These are available on the FR500 crate engine. The heads on the FR500 are available from FRPP under part #'s M-6049-T46 and M-6050-T46. These heads are bare, but FRPP does sell a hi-lift (12mm) camshaft kit that includes cams, valves, springs, retainers, and rockers under part # M-6550-T46. The heads sell for about 800.00 each and the cam kit is 1495.00

All of the tumble port heads respond well to a port and polish job. Unless you have money to burn, justifying the additional expense of the FR500 heads may be difficult. The standard heads can be made to provide all the flow necessary for even the highest horsepower applications.

5.4L DOHC
Twin port heads have never been offered for the 5.4L engines. You are limited to the Navigator heads unless you come across a set of Cobra R heads (you might have a better shot at hitting the lottery). Being limited to the Navigator heads is not a bad thing as these heads flow a large amount of air. Port and polish these heads and you will see port flow in excess 325 cfm. There is no horsepower to be gained by trying to run Cobra heads, the Navigator heads with their large ports allows the use of much larger intake runners. Below is an outline of the commonly available DOHC heads.

Twin Port Head
Dimensions (Intake)
Square Port 32mm x 40mm
Oval Port 36mm x 44mm

1999 & Later 4.6L Tumble Port (Intake)
50mm x 39mm

1998 & Later 5.4L Tumble Port (Intake)
59mm x 39mm

All DOHC Exhaust Ports
48mm x 25mm



Cooling System

The 4.6L, 5.4L & 6.8L cast iron blocks use a cooling system that is different from the one that is used on the aluminum blocks. The aluminum blocks use a bypass hose (this is the hose that runs in front of the engine to the thermostat housing) to keep flow constant through the block to help eliminate hot spots. This is due to aluminum being more susceptible to hot spots than is cast iron. If you are running an aluminum block do not eliminate this hose. The cast iron blocks utilize a conventional cooling system (no bypass hose).


Oil System

The oil pump used on modular engines is what's referred to as a gerotor pump. It contains two internal gears with the middle one being driven by the crank. The clearance between the sides of the gears and the internal sides of the oil pump are critical. These pumps are not as robust as the pumps used on the older push rod Ford's. If any debris gets into the oil pump it will gall the sides of the aluminum housing, creating a situation where the pump will not prime. If you are reusing an oil pump be sure to pull the cover off the pump for a close inspection of the housing for galling. Replacing this pump after installation of the engine is not a fun job.
There have also been failures of the powdered metal gears utilized in these pumps when used in
hi-performance applications. There are billet pump gears being offered by some vendors to address this problem, do a search on Google and you will come up with several suppliers.
FRPP also offers a high volume oil pump. It is available under part # M-6600-D46 for 59.95. This pump is the same unit as is used in the Cobra's and does not have billet gears.


Engine Weights and Dimensions

Engine Weight
4.6L SOHC 500 lbs.
5.4L SOHC 525 lbs
4.6L DOHC Aluminum Block 425 lbs
5.4L DOHC 540 lbs
6.8L SOHC V-10 640 lbs.

Accurate weights are hard to come by. It seems everyone has their own idea of what constitutes an engine assembly. Was it weighed with all the accessories, was it dry or filled with fluids, etc. Use this as a guide, these numbers are close but will vary from what you see elsewhere.



Dimension A measures from the top of the throttle body pad (if you are running our intake) or top of the factory intake (if stock) to the bottom of the factory oil pan.
Dimension B measures from the bell housing face to the front of the water pump pulley.
Dimension C measures from the outside edge of each cylinder head.



Engine "A" "B" "C"
4.6L SOHC Mustang Intake * 23 5/8" *
5.4L SOHC F-Series Intake 28 " 23 5/8" *
4.6L DOHC Cobra Intake 27 1/8" 23 5/8" 26 5/8"
4.6L DOHC Sullivan Intake 27 3/4" 23 5/8 26 5/8"
5.4L DOHC Navigator Intake 35 1/2" 23 5/8" 28 1/4"
5.4L DOHC Sullivan Intake 28 1/2" 23 5/8" 28 1/4"
6.8L SOHC V-10 Van Intake 28 1/2" 27 1/8" *



Water Outlet / Oil Filter Mount

According to Babcox there have been at least 6 different castings for the water outlet / oil filter mount. These castings are interchangeable for all of the modular engines. The one you will probably want to use is found on the Cobras and some Mustangs. You can get it at your Ford dealer under part # F8ZZ6881AA. It retails for about 150.00. This casting accepts a factory oil cooler that also doubles as your water outlet, the water outlet exits above the power steering pump. The factory cooler is also available from Ford under part # F8ZZ6A642BA, it sells for about 150.00.
If you are running our 5.4L single plane intake and opted to relocate the alternator with our bracket, you will need the oil cooler housing off the 2003 cobra. The water outlet on this housing exits below the power steering pump. This cooler is available under part # 2R3Z6A642AA for about 150.00.

Engine Mounts

All of the modular engines have the same basic mounting locations on the cylinder block. This means you can take the mounts off a 4.6L Mustang Cobra, bolt them onto a 5.4L Navigator engine and bolt the engine directly onto the factory cross member. This scenario also applies to the 6.8L V-10, 5.4L SOHC, or the 4.6L SOHC.
The only exception to this is the Continental blocks previously discussed. For your information the Cobra R model used motor mounts that lowered the engine in the chassis 12mm, It did however, bolt onto the standard Mustang cross member. Something to think about if you are having hood clearance issues. If you are a
Mustang owner and want to go with a tubular cross member we very highly recommend Anthony Jones Engineering. Their cross members fit perfect and the quality is the best on the market. They can be reached
at http://www.ajeracing.com


Exhaust

The 4.6L & 5.4L share the same exhaust port configuration. You can use a pair of Cobra shorty headers for your 5.4L DOHC transplant if you wish. None of the long tube headers currently available for the DOHC Cobra will work with the 5.4L swap inside a Mustang without modification. There are no commercially available swap headers at this time. Same thing goes for the 4.6L & 5.4L SOHC. There are several company's making shorty headers for the V-10, do a Google search for "Ford V-10 headers" and several will come up.