2001 Cobra Project - Mustang Evolution

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Old 10-18-2012, 07:10 PM   #1
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2001 Cobra Project

Hey guys and gals!

Tomorrow night I am beginning tear-down on my 2001 cobra. Car runs great, but I have bad valve stem seals.... giving me an excuse to convince my wife to let me spend money on a full rebuild.... YES!

I am going to be installing the following.

-Heads are being ported and polished (~stage 2) by a local shop
-new valve seals
-Ford GT Supercar cams
-high performance springs
-Billet cam spacer
-new lifters
-90mm Lightning MAF
-36# injectors
-Tubular K member
-Longtubes and o/r H pipe
-Full-tilt-boogie (5000) bushing kit

Then a Dyno tune to top it off...

Car has a brand new short block, with a terminator crank, as of January 2012... but the guy before me re-installed the heads with bad valve seals...

Does anyone have any suggestions or GOOD advice?

This is going to be my first build with a OHC setup... so it's pretty new to me, but I'm having help from my Father-in-law who has some knowledge of these heads... so we'll be fine as long as we take our time.

I'm going to keep the car N/A for now... so don't tell me to add a blower...

Thanks!
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Old 10-19-2012, 02:58 PM   #2
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Really? There aren't any Do-it-yourselfers in the Mustang world?
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*01 Cobra, 4.6L, P&P heads, Stage 3 comp cams, MAC LT headers, O/R Hpipe, Bassani catback exhaust, Too many bolt-ons to list..., 4.30 gears. (364 rwhp/ 330 rwtq)
*01 Roush Stage 2, 4.6L, 5 spd, BBK Bolt-ons (Wife's)
*71 Chevelle, 350, 4 spd, H/C/I, (~400 hp)
*72 C10, 350, Auto, (my Daily Driver)
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Old 10-19-2012, 03:12 PM   #3
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Could be because its in the SVT section. I'll move the thread to the 96 - 04 section and see if she gets some lookers.
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Old 10-19-2012, 04:45 PM   #4
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Goodluck , Ive done a rebuilt in my GT just make sure to torque things down to specs and get new mounts.
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Old 10-19-2012, 05:59 PM   #5
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are you going to have the local shop install all the valvetrain or are you going to do it? if they arent i would see how much they charge to assemble. I only say that because it is so tedious and irritating installing the springs. i always found it better to just pay someone to do it haha
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Old 10-19-2012, 08:30 PM   #6
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Aww, SVT, no problem. Wondering though, why 36 lb injectors? Also, are u upgrading the fuel system?
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Old 10-21-2012, 03:22 PM   #7
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I'm doing all the work myself. Just wanting advice for installing timing chain with 4 cams... so GT guys with only 2 cams can't really answer this question. That's why I posted to the SVT section...

---------- Post added at 02:19 PM ---------- Previous post was at 02:15 PM ----------

Quote:
Originally Posted by LAS97GT View Post
Aww, SVT, no problem. Wondering though, why 36 lb injectors? Also, are u upgrading the fuel system?
Because my 24# injectors are maxed out with just bolt-ons and a racing tune... so I will definitely need new injectors after full heads/cams/exhaust work. 24# injectors are only suppose to be good for about 320-340 bhp... that's the factory horsepower for this car... May be getting a pair of factory terminator injectors, that will do the trick. Fuel system won't need replaced unless I throw boost on it... You can always tune bigger injectors to act smaller... but not the other way around.

---------- Post added at 02:22 PM ---------- Previous post was at 02:19 PM ----------

Quote:
Originally Posted by poncho2049 View Post
are you going to have the local shop install all the valvetrain or are you going to do it? if they arent i would see how much they charge to assemble. I only say that because it is so tedious and irritating installing the springs. i always found it better to just pay someone to do it haha
The guy who is porting my heads is also installing the lifters, springs, and valve seals... all included in his price that he quoted me, so I'm definitely gonna let him do it... Thanks!
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*01 Cobra, 4.6L, P&P heads, Stage 3 comp cams, MAC LT headers, O/R Hpipe, Bassani catback exhaust, Too many bolt-ons to list..., 4.30 gears. (364 rwhp/ 330 rwtq)
*01 Roush Stage 2, 4.6L, 5 spd, BBK Bolt-ons (Wife's)
*71 Chevelle, 350, 4 spd, H/C/I, (~400 hp)
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Old 10-23-2012, 08:01 PM   #8
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Would anyone happen to know if there is any real performance gain from having valve work done with larger valves put in? The guy that's going to work on my heads was asking if I had ordered any larger valves or if I just wanted him to clean up my stock valves... Thanks!
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*01 Cobra, 4.6L, P&P heads, Stage 3 comp cams, MAC LT headers, O/R Hpipe, Bassani catback exhaust, Too many bolt-ons to list..., 4.30 gears. (364 rwhp/ 330 rwtq)
*01 Roush Stage 2, 4.6L, 5 spd, BBK Bolt-ons (Wife's)
*71 Chevelle, 350, 4 spd, H/C/I, (~400 hp)
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Old 10-24-2012, 08:43 AM   #9
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Nice ride!
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Old 10-24-2012, 09:25 AM   #10
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Larger valves, more flow into the actual clylinder... So yes it's worth it
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Old 10-24-2012, 10:34 AM   #11
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Ad a blower!!!! Ja jk, sweet plan you got there sir.
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Old 10-25-2012, 10:54 AM   #12
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Quote:
Originally Posted by bmabbott
Hey guys and gals!

Tomorrow night I am beginning tear-down on my 2001 cobra. Car runs great, but I have bad valve stem seals.... giving me an excuse to convince my wife to let me spend money on a full rebuild.... YES!

I am going to be installing the following.

-Heads are being ported and polished (~stage 2) by a local shop
-new valve seals
-Ford GT Supercar cams
-high performance springs
-Billet cam spacer
-new lifters
-90mm Lightning MAF
-36# injectors
-Tubular K member
-Longtubes and o/r H pipe
-Full-tilt-boogie (5000) bushing kit

Then a Dyno tune to top it off...

Car has a brand new short block, with a terminator crank, as of January 2012... but the guy before me re-installed the heads with bad valve seals...

Does anyone have any suggestions or GOOD advice?

This is going to be my first build with a OHC setup... so it's pretty new to me, but I'm having help from my Father-in-law who has some knowledge of these heads... so we'll be fine as long as we take our time.

I'm going to keep the car N/A for now... so don't tell me to add a blower...

Thanks!
Sexy car
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Old 10-25-2012, 07:38 PM   #13
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I did some research and called MMR (since I'm ordering most of my parts from them anyways)

Going with .5 mm-Over valves... the tech at MMR said you can't go wrong with that. Not a huge performance gain, but will give me a higher quality valve and open the door for more power adders later. More research showed that any larger than that can lead to the valves being too heavy, causing them not to open and close properly...

Just a little FYI
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*01 Cobra, 4.6L, P&P heads, Stage 3 comp cams, MAC LT headers, O/R Hpipe, Bassani catback exhaust, Too many bolt-ons to list..., 4.30 gears. (364 rwhp/ 330 rwtq)
*01 Roush Stage 2, 4.6L, 5 spd, BBK Bolt-ons (Wife's)
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Old 11-11-2012, 04:54 PM   #14
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Finally got the heads off. Kind of a pain to get them off, but went fairly smoothly. Discovered that my vlaves weren't closing completely, AND that the previous owner re-installed a bad head gasket on the passenger side when he installed the heads on the new shortblock...

Now, I'm going with the Comp Cams 106500 instead of the supercar cams because the supercar cams are on a 4 month waiting list... and their not worth waiting that long...
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*01 Cobra, 4.6L, P&P heads, Stage 3 comp cams, MAC LT headers, O/R Hpipe, Bassani catback exhaust, Too many bolt-ons to list..., 4.30 gears. (364 rwhp/ 330 rwtq)
*01 Roush Stage 2, 4.6L, 5 spd, BBK Bolt-ons (Wife's)
*71 Chevelle, 350, 4 spd, H/C/I, (~400 hp)
*72 C10, 350, Auto, (my Daily Driver)
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Old 11-11-2012, 05:03 PM   #15
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Also.. I know Underdrive Pulleys seem like something that's OK to go with the cheaper brand to save some $... but a word of warning, I was leaking some oil at the from of my motor, and when I pulled the crank pulley off, it had a large groove in it. Just a poor quality pulley that wore out. So just a heads up before any of you go buying the SR Performance pulley. I'm going to get Steeda now so this doesn't happen again.
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*01 Cobra, 4.6L, P&P heads, Stage 3 comp cams, MAC LT headers, O/R Hpipe, Bassani catback exhaust, Too many bolt-ons to list..., 4.30 gears. (364 rwhp/ 330 rwtq)
*01 Roush Stage 2, 4.6L, 5 spd, BBK Bolt-ons (Wife's)
*71 Chevelle, 350, 4 spd, H/C/I, (~400 hp)
*72 C10, 350, Auto, (my Daily Driver)
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Old 11-12-2012, 10:14 AM   #16
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Nice rides bro.


What's that Chevelle got?
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Old 11-13-2012, 07:03 PM   #17
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Quote:
Originally Posted by WheelStander
Nice rides bro.

What's that Chevelle got?
My signature pretty much explains what both cars have... But the chevelle is getting a new cam and heads this winter too... But it's not really ever gonna be a speed demon...
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*01 Cobra, 4.6L, P&P heads, Stage 3 comp cams, MAC LT headers, O/R Hpipe, Bassani catback exhaust, Too many bolt-ons to list..., 4.30 gears. (364 rwhp/ 330 rwtq)
*01 Roush Stage 2, 4.6L, 5 spd, BBK Bolt-ons (Wife's)
*71 Chevelle, 350, 4 spd, H/C/I, (~400 hp)
*72 C10, 350, Auto, (my Daily Driver)
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Old 11-13-2012, 07:47 PM   #18
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Quote:
Discovered that my vlaves weren't closing completely, AND that the previous owner re-installed a bad head gasket on the passenger side when he installed the heads on the new shortblock...
I'd say that list looks pretty good on parts, however the single most important thing i would make sure it absolutely right is the heads, make sure you put enuff spring pressure but not over the top, something durable...a good valve job from a reputible company.
just having your valves close all the way, and that head gasket is going to make a huge difference on power.
did you do a compression test on each cylinder before tearing it down?

Remember to MATCH all of the components from the tb, intake, heads, valves, springs, cams, every component, headers, x or h pipe, mufflers, and even the size of the tail pipe, gear ratio, and depending on what you are wanting this car to do...tires...
if you build a HUGE amount of power and have crappy tires on there (especially with 4:10 gears) your wasteing ur money imho.
good luck. sweet looking ride.
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Old 11-13-2012, 08:15 PM   #19
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Quote:
Originally Posted by Harper

I'd say that list looks pretty good on parts, however the single most important thing i would make sure it absolutely right is the heads, make sure you put enuff spring pressure but not over the top, something durable...a good valve job from a reputible company.
just having your valves close all the way, and that head gasket is going to make a huge difference on power.
did you do a compression test on each cylinder before tearing it down?

Remember to MATCH all of the components from the tb, intake, heads, valves, springs, cams, every component, headers, x or h pipe, mufflers, and even the size of the tail pipe, gear ratio, and depending on what you are wanting this car to do...tires...
if you build a HUGE amount of power and have crappy tires on there (especially with 4:10 gears) your wasteing ur money imho.
good luck. sweet looking ride.
Already ahead of you...

It's a brand new short block... Heads are being machined/assembled by a professional. I already have every bolt-on you can do... Nitto 555R's... Just need to to the ftbr5000 bushing kit, and get a good dyno tune... (Looks like Kurgan may do it)... And this thing should be pretty nasty for a N/A Cobra.
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*01 Cobra, 4.6L, P&P heads, Stage 3 comp cams, MAC LT headers, O/R Hpipe, Bassani catback exhaust, Too many bolt-ons to list..., 4.30 gears. (364 rwhp/ 330 rwtq)
*01 Roush Stage 2, 4.6L, 5 spd, BBK Bolt-ons (Wife's)
*71 Chevelle, 350, 4 spd, H/C/I, (~400 hp)
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Old 11-13-2012, 08:17 PM   #20
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sounds good.
throw up a dyno jpg when you get it done. I always like to see those
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Old 11-13-2012, 08:34 PM   #21
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Quote:
Originally Posted by Harper
sounds good.
throw up a dyno jpg when you get it done. I always like to see those
Will do. I will keep updating this thread throughout the rebuild...
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*01 Cobra, 4.6L, P&P heads, Stage 3 comp cams, MAC LT headers, O/R Hpipe, Bassani catback exhaust, Too many bolt-ons to list..., 4.30 gears. (364 rwhp/ 330 rwtq)
*01 Roush Stage 2, 4.6L, 5 spd, BBK Bolt-ons (Wife's)
*71 Chevelle, 350, 4 spd, H/C/I, (~400 hp)
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Old 11-13-2012, 10:45 PM   #22
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Originally Posted by bmabbott View Post
I'm doing all the work myself. Just wanting advice for installing timing chain with 4 cams... so GT guys with only 2 cams can't really answer this question. That's why I posted to the SVT section...[COLOR="Silver"]
This is the file you need. Any questions I can help. Did my engine 99% (machining done by a shop) Heads ported by me.
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Old 11-14-2012, 09:08 AM   #23
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saved...thanks 32vnomad...
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Old 11-19-2012, 05:15 AM   #24
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OK.

Going with the Comp Cams stage 2 (106400) instead of the supercar cams...

Just trying to figure out who will give me the best deal on them... looks like MMR at the moment. Hoping to order tomorrow.

Is RPMOutlet still in business? the website is up, but isn't functioning when you try to buy something... and no one answered the phone when I called... cause their prices are the cheapest.
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*01 Cobra, 4.6L, P&P heads, Stage 3 comp cams, MAC LT headers, O/R Hpipe, Bassani catback exhaust, Too many bolt-ons to list..., 4.30 gears. (364 rwhp/ 330 rwtq)
*01 Roush Stage 2, 4.6L, 5 spd, BBK Bolt-ons (Wife's)
*71 Chevelle, 350, 4 spd, H/C/I, (~400 hp)
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Old 11-19-2012, 06:39 AM   #25
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I thnk they might be under a diff website now or something and are reselling mostly hids or something like that.

I would stick with Mmr or risk losing your money IMO.
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Old 11-25-2012, 06:04 PM   #26
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Measured my bore... just to make sure that everything's good...

Discovered this block is bored .060 over. Brand new sleeves and oversized pistons. Makes this motor a 289. (4.735 Liters)

Would have been nice to know that before...
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*01 Cobra, 4.6L, P&P heads, Stage 3 comp cams, MAC LT headers, O/R Hpipe, Bassani catback exhaust, Too many bolt-ons to list..., 4.30 gears. (364 rwhp/ 330 rwtq)
*01 Roush Stage 2, 4.6L, 5 spd, BBK Bolt-ons (Wife's)
*71 Chevelle, 350, 4 spd, H/C/I, (~400 hp)
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Old 11-25-2012, 07:00 PM   #27
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Quote:
Originally Posted by bmabbott
Finally got the heads off. Kind of a pain to get them off, but went fairly smoothly. Discovered that my vlaves weren't closing completely, AND that the previous owner re-installed a bad head gasket on the passenger side when he installed the heads on the new shortblock...

Now, I'm going with the Comp Cams 106500 instead of the supercar cams because the supercar cams are on a 4 month waiting list... and their not worth waiting that long...
Um just a question did you take the heads off with the cams still installed????
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Old 11-25-2012, 07:12 PM   #28
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Originally Posted by 32vNomad

Um just a question did you take the heads off with the cams still installed????
Yes. had the intoned at TDC, and had A tool to hold them in place to make sure my mechanic can mark where they were...

---------- Post added at 08:10 PM ---------- Previous post was at 08:09 PM ----------

Quote:
Originally Posted by bmabbott

Yes. had the intoned at TDC, and had A tool to hold them in place to make sure my mechanic can mark where they were...
Engine*** not intoned, lol

---------- Post added at 08:12 PM ---------- Previous post was at 08:10 PM ----------

I also marked all the timing chains... I did it all "by the book"... Everything is good so far.
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*01 Cobra, 4.6L, P&P heads, Stage 3 comp cams, MAC LT headers, O/R Hpipe, Bassani catback exhaust, Too many bolt-ons to list..., 4.30 gears. (364 rwhp/ 330 rwtq)
*01 Roush Stage 2, 4.6L, 5 spd, BBK Bolt-ons (Wife's)
*71 Chevelle, 350, 4 spd, H/C/I, (~400 hp)
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Old 11-25-2012, 09:43 PM   #29
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Also.. I know Underdrive Pulleys seem like something that's OK to go with the cheaper brand to save some $... but a word of warning, I was leaking some oil at the from of my motor, and when I pulled the crank pulley off, it had a large groove in it. Just a poor quality pulley that wore out. So just a heads up before any of you go buying the SR Performance pulley. I'm going to get Steeda now so this doesn't happen again.
Just so you know when you remove the crank bolt, you are to reinstall it with a dab of silicone. This is in the removal and install instruction from Ford.
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Old 03-15-2013, 06:12 PM   #30
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Originally Posted by 32vNomad View Post

Just so you know when you remove the crank bolt, you are to reinstall it with a dab of silicone.
Also need a new bolt since It's TTY. We just dropped the motor in, and am hoping to fire it up by tomorrow. Dyno tune coming soon. I'll post a video and pic of the dyno sheet.
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*01 Cobra, 4.6L, P&P heads, Stage 3 comp cams, MAC LT headers, O/R Hpipe, Bassani catback exhaust, Too many bolt-ons to list..., 4.30 gears. (364 rwhp/ 330 rwtq)
*01 Roush Stage 2, 4.6L, 5 spd, BBK Bolt-ons (Wife's)
*71 Chevelle, 350, 4 spd, H/C/I, (~400 hp)
*72 C10, 350, Auto, (my Daily Driver)
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Old 03-15-2013, 06:18 PM   #31
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Stage 3 comp cams in ported heads. Comp Cam adjustable cam gears, Mmr lightweight cam spacers, Manley performance springs, new valves, new lifters, new valve guides

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centerforce duel friction clutch

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Mac LT headers, A/C delete pulley, Steeda UD pullies
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*01 Cobra, 4.6L, P&P heads, Stage 3 comp cams, MAC LT headers, O/R Hpipe, Bassani catback exhaust, Too many bolt-ons to list..., 4.30 gears. (364 rwhp/ 330 rwtq)
*01 Roush Stage 2, 4.6L, 5 spd, BBK Bolt-ons (Wife's)
*71 Chevelle, 350, 4 spd, H/C/I, (~400 hp)
*72 C10, 350, Auto, (my Daily Driver)
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Old 05-01-2013, 04:54 PM   #32
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If anyone is still folowing this post....

Here were the numbers from after the dyno tune:

384 rwhp
372 rwtq

Now, this was on a Mustang Dyno, which I believe read lower than a dyno jet. On May 18th, I will have a DynoJET number.

I still feel this is a pretty good number for a N/A motor with stock compression! It equals about 450 bhp assuming a 15% drivetrain loss.
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*01 Cobra, 4.6L, P&P heads, Stage 3 comp cams, MAC LT headers, O/R Hpipe, Bassani catback exhaust, Too many bolt-ons to list..., 4.30 gears. (364 rwhp/ 330 rwtq)
*01 Roush Stage 2, 4.6L, 5 spd, BBK Bolt-ons (Wife's)
*71 Chevelle, 350, 4 spd, H/C/I, (~400 hp)
*72 C10, 350, Auto, (my Daily Driver)
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Old 05-01-2013, 05:13 PM   #33
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Quote:
Originally Posted by bmabbott View Post
If anyone is still folowing this post....

Here were the numbers from after the dyno tune:

384 rwhp
372 rwtq

Now, this was on a Mustang Dyno, which I believe read lower than a dyno jet. On May 18th, I will have a DynoJET number.

I still feel this is a pretty good number for a N/A motor with stock compression! It equals about 450 bhp assuming a 15% drivetrain loss.
Not bad!
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2002 5 speed Comp Orange Mustang GT. K&N CAI,JBA headers,BBK xpipe,SLP mufflers to turn downs,Exedy stage 2 clutch,MGW short throw,drilled and and slotted roters,front:17x9 black 10th anniversary cobras Rear:17x10.5 black 10th anniversary cobras,Roush stage 3 body kit,smoked tails and side markers.
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Old 05-01-2013, 05:34 PM   #34
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Quote:
Originally Posted by bmabbott View Post
If anyone is still folowing this post....

Here were the numbers from after the dyno tune:

384 rwhp
372 rwtq

Now, this was on a Mustang Dyno, which I believe read lower than a dyno jet. On May 18th, I will have a DynoJET number.

I still feel this is a pretty good number for a N/A motor with stock compression! It equals about 450 bhp assuming a 15% drivetrain loss.
Sick n/a build. Ready to sell? lol
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Old 05-01-2013, 09:31 PM   #35
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You gotta do a video!!!!
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2007 Mustang Gt
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