Question about some 4v heads??

[Youngblood]

Im starting to get some parts together to build a motor for my marauder. And im trying to decide what heads to go with. Ive found several sets on svtperformance as well as other sites . i was planning on buying cobra head sand having them cnc ported and putting cams in. But then i found a set but not sure if they will work for my application. car will be n/a still usuing marauder intake, and prob set of l/t headers

My question is i found a set of brand new ford racing heads part number m6049-t46 and m6050-t46. fully assembled. with 03-04 cobra cams valves springs cam followers ect. i beleive these are discontinued and cant find much info on these. are these the ford racing gt heads or fr500 heads? i know they will bolt up but will my intake fit correctly besides having to port it? also are they stock size valves or larger? also will these cams be ok for my setup or should i swap to a diff set?

[LANDY]

Are they 5.4 or 4.6 heads?
If they are 5.4 you will have to make adapters or find them to be able to fit the factory intake.
That's will also be critical with your hood clearance.

[Youngblood]

4.6 heads. trying to find out if any one knows about these heads. if they are updated as far as cooling? are they factory or were they ported from ford racing? read a few things about them and they seem like good heads. read somewhere that they are 60hp bolt on with the ford high lift cam kit. idk how real those numbers are but any gains would be nice.

[LANDY]

They are 60hp bolt on against what engine combo.

[Youngblood]

from what i read these heads and ford high lift cam kit and free flowing exaust...honestly sounds a little crazy..this is from one of the sites that used to sell these heads

Improved high flow port design. Air flow increased approximately 20% intake and 15% exhaust over production heads
Can be used with stock or Ford Racing intake and exhaust manifolds
Can use stock cams, valves, springs, retainers and followers
Best performance when used with Ford Racing Performance Parts high lift cams, performance valves, springs, retainers and followers M6550T46
Approximately 60 HP increase when used with Ford Racing Performance Parts camshafts, intake system, headers, free flow exhaust and recalibrated computer.

now will heads off a 99-02 cobra work on our motors?

[musclemerc]

You can run those no problem but the maximum gains will be with a full FR500 upgrade. The dual runner FR500 intake will complement the setup but hood clearance will be an issue.

[Youngblood]

will the stock marauder intake still work on these fr500 heads? also do you think ill see any hp or am i better off with my facory heads

[massacre]

These sound like they might be FR500 heads. If they have the FR500 valvetrain, that is a pretty stout combo and make great power.
Good for you. IIRC FR500 can fit reg 4.6 intake with some work, and if you're going to have the heads cnc ported, might need to port-match the intake as well.

[LANDY]

Yes they will work on factory intake. Like T said the fr500 full setup would work better.
It all depends how much of a deal your getting. If you paying retail you might be better of buying a low mileage 9 thread heads form an 04 cobra and savings the rest of the coin for FI.

[Youngblood]

well the heads are brand new. never fired. have 03-04 cobra cams in stalled with what im guessing are factory size valves and springs and retainers. before i buy them ill have the guy measure the valves for me to see what im working with. getting the pair complete for 750..which is below the cost of 1 head bare. its a killer deal. even got plenty of pics rom seller to confirm these are fr500 heads. i just want to make sure ill see some hp gains from swapping these heads with the cobra cams and ect. i dont plan on installing the fr500 intake because im on a limited budget and seems like itll need plenty of modification to fit my marauder.. so ill prob get heads which will be going on a stock short with a set of long tubes, intake spacer, u/d pulleys and my kn intake. then in a few months ill be building up my 5.0 stroker.

[LANDY]

For that price. Jump on it right now.

[musclemerc]

It's well known 03/04 heads are some of the best Ford ever released now to my point, why consider a FR500 set of heads if they dont have the FR500 parts installed? Cams, valves, springs, etc. All these parts were specialy designed to work in tandem.

[Youngblood]

Well ill most likely install the fr500 cams and sell the cobra cams. Ik know 03-04 heads are the best but don't these fr500 heads flow better? From what i read these heads flow 20% more on intake and 15% on exaust. Ikm trying to assemble a long block to swap right ino my car to reduce down time

[Youngblood]

So before I pull the trigger on the heads I just want to confirm which are better heads...fr500 or 03-04 4v heads. Just want to make sure I'm not down grading when I throw together my motor that will replace my current stock 03 motor (which has developed a knock) hence why I'm building this one.

[massacre]

Not sure about FR500 heads, and FR500 valvetrain, with Terminator cams.

Maybe check modfords?

[LANDY]

For those who don't know, terminator heads are the same as ours. The only difference is the 04 cobra are 9 thread. The fr500 are better heads period. Even if they were the same $750 for both fully assembled heads its a deal I wouldn't pass up if I was in the market

[Youngblood]

thank you. the guy im buying them from is going to measure the size of the valves tomorrow for me. most likely they are stock size being that they have cobra cams. but im keeping my fingers crossed and maybe theyll be bigger valves =). but im deff buying the heads. might do high lift cams and sell cobra cams but ill see how my funds are. any idea what type of modifications they will require to bolt up the marauder intake manifold? beleive some one said it isnt a direct bolt on.


also can these be ported even more? or are fr500 heads to their max? ill also be porting the intake to match as well

[SpartaPerformance]

IF I'm not mistaken those heads should be "C" heads (single large intake port) and should fit on the Marauder intake no issues.

[Youngblood]

Sweet..thank you for the info. Seems like this build should go smooth. Thank you every one for all the help and info. I really apreciate the help