03 cobra shortblock.... - Forums at Modded Mustangs
 
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post #1 of 12 Old September 23rd, 2009, 01:08 AM Thread Starter
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03 cobra shortblock....

This is the 03 cobra shortblock im going to snag.... Everything look aight to you guys? Recognize it as the forged cobra block?








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post #2 of 12 Old September 23rd, 2009, 01:09 AM Thread Starter
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my question is, this should be good to go after some good cleaning and such huh? Recommendations?


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IW 15% OD pulley
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post #3 of 12 Old September 23rd, 2009, 09:42 PM
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looks of from the pics you got there. i would spray the cylinders down with some lubricant, turn by hand, and to get a better look at what the cylinder walls look like.



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post #4 of 12 Old September 23rd, 2009, 10:15 PM
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Yes after some good cleaning it should be fine. How many miles are on it? might be worth re ringing it since your in there and a quick hone on the cylinders if it had alot of miles. But it looks pretty good


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post #5 of 12 Old September 30th, 2009, 09:41 PM
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I have an 03 Cobra Shortblock that shaved a rod bearing. 40K miles not run hard at all.
Let me know if you are interested current offer is 1100.00.

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post #6 of 12 Old October 1st, 2009, 06:58 PM
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I thought cobras all came with aluminum blocks. That block is clearly cast iron, look at all the rusty spots. Plus, the 4v blocks had bungs cast into the vally for knock sensors, and that block does not. I dont think that is a cobra block, and gt blocks didnt come with forged internals. Another thing to look at would be the bolt patern on the crank for the flywheel, a forged cobra crank will have 8 bolt holes, where as a non forged crank will only have 6.
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post #7 of 12 Old October 1st, 2009, 07:01 PM
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03/04 cobras came with iron blocks tbird.

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post #8 of 12 Old October 1st, 2009, 07:01 PM Thread Starter
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tbird, that is more of the info i was looking for. he said while he was out of town his roommate sold it to someone else anyway so not an option anymore. Ive decided to do my own build anyway.


4.75 MMR 900se
Livernois ported heads
HP 292s blower cams
Procharger D1sc at 20+ psi
IW 15% OD pulley
(and more bolt ons)
E85

Tune/numbers coming shortly!!
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post #9 of 12 Old October 1st, 2009, 07:10 PM
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post #10 of 12 Old October 1st, 2009, 07:13 PM
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Quote:
Originally Posted by tbird88tbo View Post
I thought cobras all came with aluminum blocks. That block is clearly cast iron, look at all the rusty spots. Plus, the 4v blocks had bungs cast into the vally for knock sensors, and that block does not. I dont think that is a cobra block, and gt blocks didnt come with forged internals. Another thing to look at would be the bolt patern on the crank for the flywheel, a forged cobra crank will have 8 bolt holes, where as a non forged crank will only have 6.
As pointed out, the 03/04 Cobra blocks are actually iron. And they do not have bungs for knock sensors as they don't use them. Which is why when you do an eaton swap on a Mach 1, you have to grind them down to make the Cobra manifold fit.


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post #11 of 12 Old October 1st, 2009, 08:19 PM
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Yep and also dont forget to mention that there are 8 bolt cast cranks as well. Some GTs got an 8 bolt cast instead of the common 6 bolt cast.

Also the whole point of the cobra block is that it comes nearly done. If you are going to rebuild it then I'd HIGHLY recommend going with a used Teksid block instead.

Teksid has 6 bolt mains compared to the Iron block having only 4. Teksid blocks are rated stock to handle 1600hp. Only problem is the weak internals. But if you are rebuilding the other block anyway then why not get a Teksid? Then you'll have a block just as strong and 90lbs+ lighter instead.

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post #12 of 12 Old October 5th, 2009, 12:58 AM
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Yep and also dont forget to mention that there are 8 bolt cast cranks as well. Some GTs got an 8 bolt cast instead of the common 6 bolt cast.

Also the whole point of the cobra block is that it comes nearly done. If you are going to rebuild it then I'd HIGHLY recommend going with a used Teksid block instead.

Teksid has 6 bolt mains compared to the Iron block having only 4. Teksid blocks are rated stock to handle 1600hp. Only problem is the weak internals. But if you are rebuilding the other block anyway then why not get a Teksid? Then you'll have a block just as strong and 90lbs+ lighter instead.

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They have forged cranks from Kellog 4140 forging not cast. A Teksid block has 2 bolt mains with secondary bolts not 4 sets of mains, and side jacking screws with sidebolts. The Iron block still only has two bolt mains with sidebolts. The only Ford block that has four bolt mains is the Ford GT block. Don't confuse yourself in thinking a Teksid block is a true four bolt main because its not. The secondary bolts are much smaller than the mains.
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