6BANGER98

The 99-04 'C' heads are better than the older 'B' heads on the 93-98 (unless you're doing a blower - then they're about the same). They require a different intake manifold.

That came from
http://forums.vintage-mustang.com/sh...p?pid/2006227/

Plus I dont know if you can just switch the heads over without switching anything else. The KB Blower is specifically for a 96-98 cobra. There is a model for a 99-01 and another for an 01-03. Plus they are much more expensive when you get the newer blowers even though they do make more HP. The blower for a 96-98 cobra is $3575. because the newer ones are intercooled they are like $6800. Ill never get this motor finished if I have to get that haha.

mustangman36578

they still flow better even with FI. i agree go with the 60# injectors. like stated earlier it will give your fuel system more breathing room to allow more fuel if needed. in order to put the C style heads on you need different intake and exhaust port is a little larger so you could use your 96-98 headers or manifolds but it would choke it a little bit. i have a 96-98 coolant crossover tube with one of the coolant temp sensors in it if you are looking for that piece still.

6BANGER98

I only have the block so far. Im trying to straighten all this out before I buy everything. The guy I was going to buy the B heads from im waiting now. If I go with the C heads though will that change the KB i need to get is the question? Also I think that will change the wiring harness, computer, etc... that I would need also due to the timing and flow difference? Correct me if im wrong.... and then it would change the accessories and everything because of the difference in location of the intake and everything on top. So I would basically be building an 01-03 motor?

livefast1

i would go with the b heads because you can find them for cheap and they only flow marginally less than c or 03-04 cobra heads. ported they all flow about the same (actually i think the b heads flow the best ported). the biggest problem with the b heads is only one of the intake ports is injected with fuel the other is air only. thus it gets carboned up easily hurting flow. deleting the egr and the pcv system (run a vac system if your goin forced induction or just run breathers) can combat the carboning.

mustangman36578

well being that the car itself is a v6 you will need a new ECU and harness anyway but you can use the C head casting with the 96-98 ecu and harness. not 100% on this but i think you can bolt the 96-98 valve covers on the C style heads so you have a place for the plug wires to run. if not you can still use the 99-04 valve covers just with no coil cover on them. it will not change timing at all and the added air flow is just another perameter compensated for in the tune.
is this the KB your looking into getting?
http://www.kennebell.net/supercharge...angcobra46.htm
if so to get this to work for c style heads all you need is the 03-04 cobra lower intake which costs roughly $350 used. as far as accesories go. if your supercharging then switching to C style heads will have no effect on where they mount but if you go NA then mounting points will move slightly but should still reach. if going NA you would need a different intake along with intake tubing but throttle and cruise cables will still reach.

SVTeeshirt

i have some 01 cobra heads with 0 miles on them, if you wan't them i can sell them, i bought them a few months ago but i think i may upgrade to 03 cobra heads, the problem is 03 cobra heads bare run what my heads do fully assembled ( mine are fulley assembled Lash adjusters valves/springs/retainers/cams(01 stock cams.)
However 03 cobra heads flow better.

livefast1

http://www.mustang50magazine.com/fea...tor/index.html
http://www.hotrod.com/howto/113_0504.../photo_01.html

not to be a smart *** and as there is alot of race prep going on in these setups compared to building a completely streetable car. somebody better tell john his heads suck.

mustangman36578

im pretty sure he built it before 1999. so the C style head wasnt in production yet. also after that fox he had a red 96 that ran in the 7s. if you asked him which heads he would rather run im sure he would probably say the C style over the B.

livefast1

i think the second link is of a recently built drag car, and still pretty sure the fastest mod motor car still sports b heads. regardless if they will support 1500 horses then they'll suffice for anything you all will want to do on the street especially when i've seen sets go for as low as 75 bux. just gotta look around.

6BANGER98

Yea I think im gona stick with the B heads just because they are cheaper and will directly work with everything im trying to do.

Still trying to find someone who has done methan injection and tell me if its a pain or not. I know it will help but KB techs claim it will work fine without regardless.... at 10-12 psi