3v heads on a 03-04 cobra engine. - Mustang Evolution

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Old 01-10-2015, 10:31 AM   #1
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3v heads on a 03-04 cobra engine.

If I was to go a FI route with my car could I buy a termi block with everything but the heads and install my 3V heads on it, right? I've heard the 03-04 cobras can withstand 500 or 600whp, does that mean the same engine with my heads would be able to withstand the same amount of power? Finally would this be more cost effective than tearing apart my block and rebuilding it With forged internals? If I take the FI route I doubt I will want over 600go.

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Old 01-10-2015, 05:57 PM   #2
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Why would you put 3v heads on a Cobra? They came with 4v heads.


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Old 01-10-2015, 06:02 PM   #3
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And I was always under the impression that
4v heads> 3v heads

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Old 01-10-2015, 06:23 PM   #4
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I think he wants to have the forged motor part of it and slap on the 3v heads so it drops right in.

It's easier just to forge your current motor. You will add a ton of weight with that cobra engine since it's an iron block.


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Old 01-10-2015, 07:01 PM   #5
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Yea that's what I was going for soccerluvr4. I didn't realise that the block was iron.

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Old 01-10-2015, 07:04 PM   #6
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Are there any other prebuilt 4.6 engines that I could just slap my heads on and install? I think there may be an aluminator block? Also is there a 4.6 with a higher compression than the 9.8:1 in our block?

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Old 01-10-2015, 07:44 PM   #7
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There are lots of places. Check out Cushman Motorsports. They have a range of shortblocks available.

I would recommend keeping your stock aluminum block though, its the late model WAP, its stronger than a Teskid block and 80 pounds lighter than an iron block.

You can get 13.0:1 compression or higher in the 4.6. Flat top pistons with 38cc heads will get you around 12.0:1 compression i believe, you can also get the block decked as well as the heads decked and pick up more compression that way. At that point you cannot run regular fuel anymore. You need E85 or race gas.
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Old 01-10-2015, 10:32 PM   #8
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Could I deck the block and heads without changing anything? Would it yield any gains? Also I don't have the experience or space to tear an engine completely apart. There is no way to replace the pistons without disassembling the engine, right? If not how much would it bee to have the engine disassembled and reassembled with new pistons?

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Old 01-10-2015, 10:36 PM   #9
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Decking the block and heads will increase compression. That's about it


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Old 01-11-2015, 11:17 AM   #10
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If you are doing a forged bottom end get a Stroker short block.
Ford racing has one complete for 4995.00.
Just bolt your top end on and go.
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Old 01-11-2015, 11:47 AM   #11
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How much would it be to have my engine disassembled, bored, and reassembled.

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Old 01-11-2015, 11:47 AM   #12
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Ford Racing also just started making a 5.3 short block. You get the longer stroke as well as the bigger bore.


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Old 01-11-2015, 11:48 AM   #13
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Could I use the 5.3 with my heads?

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Old 01-11-2015, 01:50 PM   #14
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Quote:
Originally Posted by Soccerluvr4 View Post
Ford Racing also just started making a 5.3 short block. You get the longer stroke as well as the bigger bore.


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Whaaaaat.....? I
wasn't informed if this....Is it an aluminum block?
JDM has a big inch mod but is a iron block....
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Old 01-11-2015, 02:11 PM   #15
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Quote:
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Whaaaaat.....? I
wasn't informed if this....Is it an aluminum block?
JDM has a big inch mod but is a iron block....
I believe it uses the Boss Block. So Iron. If they made one with the aluminum i'd be all over it. Except at that point with TFS heads it'll be cheaper to put in a coyote lol.
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Old 01-11-2015, 02:56 PM   #16
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I believe it uses the Boss Block. So Iron. If they made one with the aluminum i'd be all over it. Except at that point with TFS heads it'll be cheaper to put in a coyote lol.
Yes, that's what JDM uses. I had a chance to go that way but the weight penalty was too much for me.
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Old 01-11-2015, 03:39 PM   #17
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Yes, that's what JDM uses. I had a chance to go that way but the weight penalty was too much for me.

Agreed. Even though I have an iron block right now. Whichever way I go with building the motor whether it is staying 2v or swapping to something else, it'll have an aluminum block. I'm considering a coyote since I won't do it for a few years and by then they will be easier to come by and don't need a whole lot of work to perform well.


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Old 01-11-2015, 04:34 PM   #18
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Agreed. Even though I have an iron block right now. Whichever way I go with building the motor whether it is staying 2v or swapping to something else, it'll have an aluminum block. I'm considering a coyote since I won't do it for a few years and by then they will be easier to come by and don't need a whole lot of work to perform well.


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You can get a brand new crate engine w/ecu and harness for less than I have in my heads and short block. I have a $4000.00 set of CNC heads worked to the max and they only flow about as much as stock coyote heads.
Stock. Thats sickening.
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Old 01-11-2015, 05:16 PM   #19
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You can get a brand new crate engine w/ecu and harness for less than I have in my heads and short block. I have a $4000.00 set of CNC heads worked to the max and they only flow about as much as stock coyote heads.
Stock. Thats sickening.
Yup. Can easily spend over $10k building the 4.6 with the best of the best stuff. Or i can just put in a coyote and forge it at the same time, replace valve springs and rev to 8k rpm.
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Old 01-11-2015, 06:18 PM   #20
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Yup. Can easily spend over $10k building the 4.6 with the best of the best stuff. Or i can just put in a coyote and forge it at the same time, replace valve springs and rev to 8k rpm.
I wish I'd only spent 10 grand....coyote is definitely the way to go.
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Old 01-11-2015, 06:19 PM   #21
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Ok well what would be needed for me to switch over to a coyote?

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Old 01-11-2015, 06:26 PM   #22
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I wish I'd only spent 10 grand....coyote is definitely the way to go.

I almost don't even want to know how much you've spent on that car lol


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Old 01-11-2015, 07:00 PM   #23
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I almost don't even want to know how much you've spent on that car lol


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Let's just say I could have bought multiple GT 500's
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Old 01-11-2015, 07:28 PM   #24
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Damn........

Just buy a Lambo lmao


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Old 01-11-2015, 07:45 PM   #25
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Damn........

Just buy a Lambo lmao


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Lambos are gay. A mustang is a mans car.
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Old 01-11-2015, 07:48 PM   #26
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Lambos are gay. A mustang is a mans car.

Idk, I have a big sweet spot for exotics lol


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Old 01-12-2015, 11:03 AM   #27
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Idk, I have a big sweet spot for exotics lol


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A big sweaty spot for exotics...?
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Old 01-12-2015, 11:08 AM   #28
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Old 01-12-2015, 12:46 PM   #29
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lol
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Old 01-12-2015, 01:03 PM   #30
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