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Author
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Topic: 03 heads on a 96-01 cobra motor
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cobraman_1994
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Member # 467
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posted
 
 
will that work?
03 cobra heads and top end
96-98 cobra lower end. it should work right? ![[Confused]](confused.gif)
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86 GT
Posts: 4882 | From: eldorado hills | Registered: Sep 2001
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4RS FED
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Member # 2067
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posted
yup
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i have a twin turbo mustang and you don't!
Posts: 3686 | From: 650 | Registered: Nov 2002
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cobraman_1994
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Member # 467
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posted
sweet
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86 GT
Posts: 4882 | From: eldorado hills | Registered: Sep 2001
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4RS FED
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Member # 2067
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posted
killer
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i have a twin turbo mustang and you don't!
Posts: 3686 | From: 650 | Registered: Nov 2002
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cobraman_1994
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Member # 467
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posted
whats the compression ratio on that motor? and whats the weak part? is it the rods?
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86 GT
Posts: 4882 | From: eldorado hills | Registered: Sep 2001
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BlackNGold
CaliforniaFords.com
Moderator
Member # 655
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posted
I'm 99% sure they will NOT work....
They are different because of the 96-98 IMRC's...If you want them to work you will need a 99+ intake manifold..
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-SLOWER TRAFFIC KEEP RIGHT-
Posts: 5132 | From: Bay Area, CA | Registered: Dec 2001
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-NORCALCOBRA-
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Member # 2383
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posted
yes they will work i am looking to sell my
fully port 96 b heads and get some navi heads they will bolt right up to your block but you will need to get a new intake manifold and fuel rails i belive
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H.C.I 285 ci. ported 2003 heads heads, Sullivan Intake, stage 3 cams..T-76 single turbo to come...
R.M.I cylinder head fabrication
408 986 8626
Posts: 516 | From: SAN JOSE | Registered: Jan 2003
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-NORCALCOBRA-
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Member # 2383
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posted
quote:
Originally posted by cobraman_1994:
whats the compression ratio on that motor? and whats the weak part? is it the rods?
well the compresion ration is 9.8:1 and yes the weak part is the rods and pistons
what is the reason you are going to the 03 heads i would recomend the fr500 heads if you are staying n/a the heads are almost identical except the exhaust ports on the 03 heads have a differnt port and will require differnt headers the fr500 have a smoother short turn radius preventing air from over shooting the short side radius and making more port velocity which is a must for n/a motors the b heads aka 96-98 (swirl port heads) flow extremly well on the intake but lack port volicty but the exhaust port dont flow that well
most of the guy running 9s and under with forced induction are using the b heads...
n/a= fr500
mild blown 4.6 cars = 8-14 of boost 03 heads
big bore mod engines + boost= navi heads
high boost apps = 96-98 heads
all the heads above flow well enough stock to make 490 hp for example you take a bone stock 96-98 b head and it flows 240 cfm @ .500 lift x .257 x number of cylinder in our case 8 = 493.33
240x.257x8=493.33 of potential hp with natural asperation..
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H.C.I 285 ci. ported 2003 heads heads, Sullivan Intake, stage 3 cams..T-76 single turbo to come...
R.M.I cylinder head fabrication
408 986 8626
Posts: 516 | From: SAN JOSE | Registered: Jan 2003
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cobraman_1994
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Member # 467
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posted
because i need it to mach the eaton im buying tommorrow ![[burnout]](graemlins/burnout.gif)
now, wich would be better...an 03 shortblock (wich im having trouble finding ![[Embarrassed]](redface.gif) ) or the alluminum block with manley rods and mod max low comp pistons?
goal is 500 rwhp wiht the normal bolt ons for an 03
[ November 28, 2003, 02:33 AM: Message edited by: cobraman_1994 ]
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86 GT
Posts: 4882 | From: eldorado hills | Registered: Sep 2001
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Stimson
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Member # 51
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posted
If you want to put '99+ heads on a '96-98 bottem end, you'll have to install a '99+ intake as well. The '99+ heads have a more efficient exhaust port and some other minor tweaks that are hardly worth the hassle. You're better off keeping life simple and porting/working your factory '96-98 heads.
Posts: 2373 | Registered: Jun 2000
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cobraman_1994
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Member # 467
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posted
yes, but the 03 cobra heads are different right? i have them...well...i paid for them anyways. i was just wondering if the 2003 cobra top end (heads, lower intake, and blower assembly) will bolt up to the older cobra shortblocks. and now i know.
i found a blower to buy, im just waiting for his response. its all coming together now ![[patriot]](graemlins/patriot.gif)
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86 GT
Posts: 4882 | From: eldorado hills | Registered: Sep 2001
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-NORCALCOBRA-
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Member # 2383
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posted
if you are buying a eaton then yes the 03 set up will work you ever be ready for fuel upgrade and alot of tuning as for a 03 block is gonna run you 4000 grand for the short block and 11,000 for the complete setup i can get you a hci built for 3200 of so let me know if you are interested in that the stock cobra block and crank are good up to about 1000 hp or so
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H.C.I 285 ci. ported 2003 heads heads, Sullivan Intake, stage 3 cams..T-76 single turbo to come...
R.M.I cylinder head fabrication
408 986 8626
Posts: 516 | From: SAN JOSE | Registered: Jan 2003
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cobraracer46
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Member # 1142
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posted
Swapping the 03 heads on to your Cobra will not work. Using 03 Cobra heads on a 2001 or earlier DOHC modular 4.6, 5.4 will result in port mismatch.
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2001 SVT cobra convertible with a Viper T56, Fikse wheels, Griggs frame kit, roll bar, Vortech, 4:30 gears, brembo GT brakes and more.
Posts: 1172 | From: Woodside California | Registered: Apr 2002
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-NORCALCOBRA-
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Member # 2383
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posted
quote:
Originally posted by cobraracer46:
Swapping the 03 heads on to your Cobra will not work. Using 03 Cobra heads on a 2001 or earlier DOHC modular 4.6, 5.4 will result in port mismatch.
wanna bet..all sohc and dohc blocks are all the same from what ia m told from cole at hci
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H.C.I 285 ci. ported 2003 heads heads, Sullivan Intake, stage 3 cams..T-76 single turbo to come...
R.M.I cylinder head fabrication
408 986 8626
Posts: 516 | From: SAN JOSE | Registered: Jan 2003
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cobraman_1994
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Member # 467
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posted
quote:
Originally posted by -NORCALCOBRA-:
quote:
Originally posted by cobraracer46:
Swapping the 03 heads on to your Cobra will not work. Using 03 Cobra heads on a 2001 or earlier DOHC modular 4.6, 5.4 will result in port mismatch.
wanna bet..all sohc and dohc blocks are all the same from what ia m told from cole at hci
thats what i thought too. thanks for all the info! ill keep everyone posted on my swap progress.
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86 GT
Posts: 4882 | From: eldorado hills | Registered: Sep 2001
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-NORCALCOBRA-
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Member # 2383
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posted
what ports would there be to mis match just water jacket ports and those are the same all you need is the eaton blower and plenum and youll be ok
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H.C.I 285 ci. ported 2003 heads heads, Sullivan Intake, stage 3 cams..T-76 single turbo to come...
R.M.I cylinder head fabrication
408 986 8626
Posts: 516 | From: SAN JOSE | Registered: Jan 2003
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cobraracer46
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Member # 1142
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posted
quote:
Originally posted by cobraman_1994:
quote:
Originally posted by -NORCALCOBRA-:
quote:
Originally posted by cobraracer46:
Swapping the 03 heads on to your Cobra will not work. Using 03 Cobra heads on a 2001 or earlier DOHC modular 4.6, 5.4 will result in port mismatch.
wanna bet..all sohc and dohc blocks are all the same from what ia m told from cole at hci
thats what i thought too. thanks for all the info! ill keep everyone posted on my swap progress.
The O3 Cobra heads will bolt up to any Cobra or other Modular V8 engine block, but you just can't go out and swap the heads on a 2001 or earlier Cobra with the 03 Cobra heads with out going to the 03 intake and exhaust headers because the the intake and the exhaust ports on the 03 Cobra heads have a new design that will result in a port mismatch if used on diffrent Cobras.
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2001 SVT cobra convertible with a Viper T56, Fikse wheels, Griggs frame kit, roll bar, Vortech, 4:30 gears, brembo GT brakes and more.
Posts: 1172 | From: Woodside California | Registered: Apr 2002
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the50ho
THE50HO
Member # 73
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posted
quote:
Originally posted by cobraracer46:
quote:
Originally posted by cobraman_1994:
quote:
Originally posted by -NORCALCOBRA-:
quote:
Originally posted by cobraracer46:
Swapping the 03 heads on to your Cobra will not work. Using 03 Cobra heads on a 2001 or earlier DOHC modular 4.6, 5.4 will result in port mismatch.
wanna bet..all sohc and dohc blocks are all the same from what ia m told from cole at hci
thats what i thought too. thanks for all the info! ill keep everyone posted on my swap progress.
The O3 Cobra heads will bolt up to any Cobra or other Modular V8 engine block, but you just can't go out and swap the heads on a 2001 or earlier Cobra with the 03 Cobra heads with out going to the 03 intake and exhaust headers because the the intake and the exhaust ports on the 03 Cobra heads have a new design that will result in a port mismatch if used on diffrent Cobras.
this man is 100% correct.
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Motorcycles and airplanes. Might be time to get back in the Mustang game.
Posts: 4057 | From: Roseville, Ca (Sacramento) | Registered: Nov 2000
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cobraman_1994
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Member # 467
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posted
i already know you cant just swap the heads on an earlier motor and expect to have everything match correctly. i was just wondering about the block matching the heads. wich i now know it does.
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86 GT
Posts: 4882 | From: eldorado hills | Registered: Sep 2001
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-NORCALCOBRA-
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Member # 2383
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posted
quote:
Originally posted by cobraman_1994:
will that work?
03 cobra heads and top end
96-98 cobra lower end. it should work right?
if anyone read this you would know what he is asking 03 cobra heads + top end which means blower so why whould you talk about ports misalignment
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H.C.I 285 ci. ported 2003 heads heads, Sullivan Intake, stage 3 cams..T-76 single turbo to come...
R.M.I cylinder head fabrication
408 986 8626
Posts: 516 | From: SAN JOSE | Registered: Jan 2003
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cobraman_1994
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Member # 467
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posted
yep. thats what this thread is all about. 03 cobra top end on a 96-01 cobra shortblock. lol
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86 GT
Posts: 4882 | From: eldorado hills | Registered: Sep 2001
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Rev Happy
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Member # 661
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posted
Poor mismatch? ![[Roll Eyes]](rolleyes.gif)
My friend ended up running high 10s with his 03 Cobra on the stock eaton with no nitrous using BBK LT headers for a 99, 01 Cobra...
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96 Cobra
Posts: 182 | From: Southern California | Registered: Dec 2001
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