Whats the Difference Between 4V 4.6L B & C Heads

Whats the Difference Between 4V 4.6L B & C Heads

[@mrdanflores]

My ford book shows that the marauder, mach 1, aviator and cobras use the same cams.....only different oem cam was the intake cam from the 96-01 cobra

[@scottnewton1021]

96-98 cams are slightly better than the 99-01 cams. Both are a good upgrade from 03-04 cobra, Mach, aviator, muradar cams

[@abreaux1777]

Its all in the tune buddy, I have a 98 cobra, 60# injectors, comp 106460, and terminator x in front of a 6r80 trans, b heads love to stay up high on the tach and the cams, trans, and 373 gear make it very lively.

[@nicholash8021]

Do you think those 460 cams would work well in an NA setup? What kind of air are you pushing and what hp/torque numbers are you getting?

[@WXSTANG]

The ideas people think about with these heads are not based in deep thought. The IMRCs on the B head allow for higher flow where the injector is making for better fuel atomization cruising. The problem is that the second ports carbon up, same with direct injected motors. The other issue is the lip on the primary valve combustion chamber which should be removed. Also, the biggest advantage of the B head is a short runner intake mod, which increases internal volume of the intake. Research PHP naturally aspirated intake manifold modification, +30rwhp with no loss of power down low. They could get that engine running 12's with no blower. I also noticed, Cobra timing doesn't work for the B heads. I had to reprogram the entire map on my B head Cobra engine, and is VERY snappy now.

[@rollthedice.5973]

Good shit brotha! I have 2 mach 1’s myself, 1 is my daily and the other is getting built as we speak! 4.6 Stroked to 5.0 with forged internals, teksid block, tremec 6 speed, full suspension kit. Just getting the car together for now, shooting for boost coming early next year 🤞🏾

[@matthewenriquez8938]

I’m so glad I found this channel, I’m tryna to put a 01 cobra 4.6 in my 97 cobra and all this information about the heads and the differences helps a lot thanks(:

[@WXSTANG]

Find my comment... B heads are good... but require more money and time. you can get 20 more HP over an equal C head engine.

[@matthewenriquez8938]

@@WXSTANG I have some livernois cnc c heads with a c to b intake adapter, I sold my cobra so I just have my built 4v thinking on throwing it in my 72 Torino squire wagon or 68 Torino gt

[@todds5956]

Price Motorsports makes 2 port to 1 port intake adapters to run a Sullivan intake on the B heads. I just ordered some. Sullivan says they work great.

[@scottnewton1021]

96-98 cobra cams are the biggest in duration vs any other oem 4v cams

[@PonchoSal25]

Which yr eng out of the aviators do you recommend for a swap. Thank you for all info

[@DriftDreams242]

04 and 05 they have the better heads, you'll need a lower and upper intake manifold from a cobra or a mark 8, or a marauders tho so it fits under your hood, best if luck friend! 🌴😁🌴

[@julesag3able]

Hi. If I’m starting out with a 98 mark8 to put in a 90 foxbody. What harness and ecu do I look for ? And is there anything I should change on the Lincoln motor ?

[@murphystreeter]

The lean may have come from sticky port blockers staying partially open.

[@cameronchorostil1822]

very informative. i bought a 96 motor to build. will be looking for c heads now. swapping my 2010 f150 2v 4.6 for a built 4v.

[@philipdonato4664]

I'm pretty sure '03-'04 Mach 1's had different cam profiles also. For more torque I believe

[@Prestiged_peck]

Nope, same cam as the marauders and aviators, the marauder and aviator needed more torque than the mach anyways being heavier (one was an SUV)

[@flea112]

96-98 cobras had different cams

[@mikeknight4337]

Bahamas all day buddy!!! Represent! Thanks for the channel dude

[@mikeknight4337]

@@DriftDreams242 your channel has been a great help for my current and previous build keep up the good work and filling us with great info!!

[@locospeed01]

I have some 2003 marauder heads hires are the c head have a question will this bolt on on a 5.4 3v block trying to swap the heads get adapters for running a coyote supercharger

[@madmod]

B head stuff isnt bad but the C heads are significantly better. Especially the 03+ Aviator, Mach 1, Marauder, and Terminator heads. Those are the best heads for the money!

[@occasionalgamer686]

You got the head ported and polished.

[@occasionalgamer686]

@@DriftDreams242 look like the factory the shinning

[@newmonengineering5052]

C heads make better torque production at lower rpms that is all.....for high rpm and lots of boost b heads are not as limited...

[@orange1soda]

B head is way better up top not the same i must disagree.

[@WXSTANG]

I have a high RPM ported B head naturally aspirated engine with FRPP cams, Ferreria valves, and a PHP stage 2 intake. The thing is ridiculously fun to drive. First gear and the tires have zero chance of hooking up... even with 315's out back.

[@Papa7Bravo]

Just a dumb question, so could i very basically bolt them heads into my crown vic then use the cobra intake/supercharger?

[@Papa7Bravo]

@@DriftDreams242 that's fine, one of my dreams would be to have a mustang, preferably an 03/04 terminator and then go for a kenne bell, i had always just thought the block was somehow different stopping you from using the same parts but that's awesome to know they do swap over so absolutely worst case if i need a new block, i can use a panther chassis block

[@rcobra36]

You forgot to mention that the main down fall of the B head is the threding of the spark plugs ! 96 cobra 1200 rwhp 76/75 precision

[@nicholash8021]

What is 76/75 precision? What's wrong with the spark plug threads? I have a 96 Cobra ans never noticed an issue with plug threads. I am looking to spend a max of $3k toward HP gains and not sure how to spend it. I have a bassani x-pipe, cold air, under drive pulleys, and a larger radiator. I need to pull the engine and replace the head gasket. While it's out, I want to take advantage of any upgrades.

[@Prestiged_peck]

@@nicholash8021 76/75 precision is a turbocharger from precision turbos, shorthand. And all 4.6 and 5.4's have issues with ejecting the spark plugs under high cylinder pressures usually only encountered in heavily built and boosted engines. You may know some of the 5.4's have issues even in stock form. This can be fixed with good inserts, most machine shops use cal-van inserts, and it's an excellent idea if the cylinder heads are off the motor to do the cal-van inserts while they're off. The later 9 thread heads (adjusted castings to add threads in the spark plug hole, early castings oy had 4 full threads) had nowhere near as many issues, but it can still happen under boost and therefore is still a good idea.

[@Prestiged_peck]

Don't forget the fact that B heads have been faster than any regular C head in the quarter mile, only beat out by the famous GT supercar/GT500 cylinder heads, and the issues that defeated the B heads appeared well past the 2k horsepower mark.

[@nicholash8021]

@@Prestiged_peck Holy cow 4 threads... what were they thinking?!! I pulled the motor and now have it on a stand. Thinking to tig weld some metal and re-tapping the heads to at least double the threads.
Heard great things about the B heads and my Teksid block. I was advised that I could benefit from some cams by John from Accufab Racing. What a wealth of knowledge he is--not to mention all the records he's made on these motors.

[@Prestiged_peck]

@Nicholas H DO NOT WELD THOSE HEADS, THEY WILL CRACK use the cal-van inserts.
Edit: for racing duty the ford aluminum inserts are actually better.

[@Drago2600]

Wonder what the mach1 would lay down with the cobra intake cam 🧐

[@newmonengineering5052]

Know what your talking about...lol. B heads out flow any c head just look it up....they actually flow to much that's why they have imrc....just open up the exhaust ports and b heads can support 2000hp....

[@nicholash8021]

B heads have a lot of potential but from 3200 RPM and up, IMRC deletes provide a substantial gain in power. Below 3200 RPM, the increased air speed with the IMRC plates closed helps a bit, but it's definitely in the way at higher RPMs and overall better to go with the deletes. See this vid th-cam.com/video/D7hKllTCSX8/w-d-xo.html.

[@BC08]

Not as they came from Ford they don’t.
The 03/04 castings outflow both B-heads and 99/01 C heads on both intake and exhaust sides.

[@BC08]

B-heads do have a ton of intake runner volume which helps them on high boost setups - but for N/A and milder boost setup 03/04 is where it’s at - more flow with less port volume.

[@rusty_gold_garage7138]

Would the B heads still have the air fuel ratio issue running a carburated intake with some adapters to go from the single intake runner to dual?

[@abreaux1777]

This is an interesting question 🤔

[@Prestiged_peck]

Nobody makes a carburetor intake for the B heads, but it would be a VERY interesting test method. I'm personally going to make a custom intake with staged injection that puts the secondary injector that comes in when you try to make real power in the runner for that secondary port.

[@tqservices2000]

Could you swap a 5.4 block for the 4.6 and take advantage of the torque the extra 50 cubic inches would provide ? As well as a forged crank in all 5.4 DOHC motors ?

[@tqservices2000]

@@DriftDreams242 >>>First let me say I love your work.. Im going to investigate further the idea of that swap... Ill check in with you on my findings...Keep up the good work

[@tqservices2000]

@@DriftDreams242 check this out.. th-cam.com/video/EVTZbGK7R_c/w-d-xo.html

[@Tentaisei]

@@DriftDreams242 C heads are 99 and up. I believe the only different between the 4.6l and the 5.4l is the deck height, the 5.4 has a longer stroke, the 5.4 is actually just a stroker 4.6 honestly. It should fit in the mustang just fine. 5.4l head and 4.6l heads are interchangeable also.

[@robertwhitey6621]

Careful on some of the used 03-04 4V heads there was an issue with some early castings having only 3-4 threads on the spark plug hole, Cobras had a problem spitting plugs out at high boost. Look for a 7 thread 4V head if adding high boost.

[@jonnyvargas9394]

Is a 2003 Lincoln aviator have C heads

[@jonnyvargas9394]

Ok thank u 4 u help

[@BC08]

All “tumble port” 4V head C-heads.
But all C-heads are not the same.

[@jeffreywillis3066]

So would the b heads be good for a 4v swap with a supercharger?

[@jeffreywillis3066]

@@DriftDreams242 well dang, yea I'm doing a 4v swap on my 01 gt 2v and I'm planning on running a cobra supercharger, so did the 03-04 cobras have c heads?

[@snarfsnarf3323]

Lol dude couldve used continental heads