2V to 4V

5408 Views 120 Replies 12 Participants Last post by norcalam2, Dec 23, 2009

MikeJones

Discussion Starter · Dec 16, 2009

So I am not too sure about these motors. I know that 4v are better then 2v. im planning on doing a kb'd 4v. and i was wondering what it would take to turn my engine into a 4v? i know that i'll need new headers and kb replace the intake. and i'm gonna forge the bottom. rough estimate of power will be 700. at the most. maybe a little nitrous we'll see. I'm thinking 03-04 heads.

I'm just planning for the future.

1 - 20 of 121 Posts

330CubeGt

· #2 · Dec 16, 2009

I would get 03/04 heads the front cover the gears chains etc etc.

dcook_14

· #3 · Dec 16, 2009

03/04 heads are going to be the best but they'll be expensive. B-heads from sn95 cobras or c-heads from the 99/01 cobras would work nicely too, and cost A LOT less.

There are several threads about 4v swaps, read up!

Reactions: 2

LGHTNG02GT

· #4 · Dec 16, 2009

i'm doing a 4v swap in my GT right now. like stated before, a motor with the 03/04 heads would be best, but that is expensive. if you plan to do a supercharger, i hear alot of good things about the B heads (96-98 Cobra and Lincoln Mark VIII's) responding well to this as they have a very high air flow rate/capacity. im sure they would be your cheapest way to go about this. its not entirely necessary to do the whole 4v swap though (im sure someone else will chime in and say that and possibly lead to another 4v vs 2v argument

) a built 2v can be a monster to drive too

but if your set on a 4v (as i am too

) you've got alot of options and it all depends how deep your pockets are :yes

Reactions: 1

mustang_gtr_99

· #5 · Dec 16, 2009

Just to throw it out there, have thought about a 3V swap? 3V's flow almost as good as the 4's, are aluminum blocks, only needs 1 set of cams, and are cheaper/more abundant. Just a thought. I am doing it

330CubeGt

· #6 · Dec 16, 2009

mustang_gtr_99 said:
Just to throw it out there, have thought about a 3V swap? 3V's flow almost as good as the 4's, are aluminum blocks, only needs 1 set of cams, and are cheaper/more abundant. Just a thought. I am doing it

Have you done any research on it to see what will need to be changed going 2 v to 3 v if so shoot me a pm so we can chat its also somthing that i have been considdring

Boostang

· #7 · Dec 16, 2009

c-heads :no
b-heads :yes

bheads are a better high reving boosting heads..
c heads are n/a heads..

since ur going with the kb then the hard too find b head intake wont be a problem..

mustang_gtr_99

· #8 · Dec 17, 2009

330CubeGt said:
Have you done any research on it to see what will need to be changed going 2 v to 3 v if so shoot me a pm so we can chat its also somthing that i have been considdring

PM sent

dcook_14

· #9 · Dec 17, 2009

LGHTNG02GT said:
i'm doing a 4v swap in my GT right now. like stated before, a motor with the 03/04 heads would be best, but that is expensive. if you plan to do a supercharger, i hear alot of good things about the B heads (96-98 Cobra and Lincoln Mark VIII's) responding well to this as they have a very high air flow rate/capacity. im sure they would be your cheapest way to go about this. its not entirely necessary to do the whole 4v swap though (im sure someone else will chime in and say that and possibly lead to another 4v vs 2v argument ) a built 2v can be a monster to drive too
but if your set on a 4v (as i am too ) you've got alot of options and it all depends how deep your pockets are :yes

2v can definitely be a monster, just look at Jive's car. Supporting mods are going to make a bigger difference on a 4v than they would on a 2v though. After the initial swap, your hp per dollar is going to be much higher on a 4v. That's why I'm going with a 4v swap.

mustang_gtr_99 said:
Just to throw it out there, have thought about a 3V swap? 3V's flow almost as good as the 4's, are aluminum blocks, only needs 1 set of cams, and are cheaper/more abundant. Just a thought. I am doing it

Haha, I was waiting for you to come and toss in the 3v option

330CubeGt said:
Have you done any research on it to see what will need to be changed going 2 v to 3 v if so shoot me a pm so we can chat its also somthing that i have been considdring

I would be very interested in this information too :yes

Boostang said:
c-heads :no
b-heads :yes

bheads are a better high reving boosting heads..
c heads are n/a heads..

since ur going with the kb then the hard too find b head intake wont be a problem..

Yep, B heads are definitely better for boost. I forgot the part about the OP wanting to supercharge. If you can get ahold of an sn95 cobra motor you'll have the forged crank, heads (with the good cams), timing components, and you can sell the intake. On a side note: B head intakes aren't as hard to find as everyone says they are, but yeah i'd rather have a KB than a Cobra intake sitting on top of my motor. What do you think... Procharger D1SC feeding a KB 2.1 hahahaha KABOOM!

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Boostang

· #10 · Dec 17, 2009

lol ok lets just stick with one supercharger

dcook_14

· #11 · Dec 17, 2009

Fine Debbie Downer, kill my dreams

Boostang

· #12 · Dec 17, 2009

lol sorry

MikeJones

Discussion Starter · #13 · Dec 17, 2009

K so I was pretty sure i could keep my 2v block. so i might as well just forge that. and this is going to be a few years of a project so money won't be that much of a issue.
Why are the b-intakes harder to find? I am stuck on 4v. and everybody seems to be throwing truck engines in their cars nowadays. haha
Will KB throw in a b-intake under the blower?

Thanks all.

LGHTNG02GT

· #14 · Dec 17, 2009

mikejones16 said:
K so I was pretty sure i could keep my 2v block. so i might as well just forge that. and this is going to be a few years of a project so money won't be that much of a issue.
Why are the b-intakes harder to find? I am stuck on 4v. and everybody seems to be throwing truck engines in their cars nowadays. haha
Will KB throw in a b-intake under the blower?

Thanks all.

you can start with a 2v block and build a 4v top end on it. this is good for an S/C as i think this makes low compression. you will need alot of small parts (all the timing stuff and such) i'd look into the coolant passages in the blocks to make sure they all line up right tho. the 2v block is iron so it can withstand a good amount of power and can work with a forged cobra crankshaft. the b-head intakes are harder to find because they were only on the 96-98 cobra's. those were the b-headed cobra heads and were on those years only. if you go the KB route, you wont have to worry about locating an intake because the blower sits right where the intake goes (it replaces it basically)

MikeJones

Discussion Starter · #15 · Dec 17, 2009

Thats what i thought. Thanks. Can ssomeone post a link to someone who did this?

MikeJones

Discussion Starter · #16 · Dec 17, 2009

Whats different about the blocks?

LGHTNG02GT

· #17 · Dec 17, 2009

mikejones16 said:
Whats different about the blocks?

well, im pretty sure the blocks are essentially the same. the only thing i could see being different is maybe the coolant passages into the heads but im not positive on this. your GT block is iron. its strong but heavy. the termi's had iron blocks too. the mach 1's and 01 cobra's had an aluminum block and 98-96 cobra's and i think the 99's too had the aluminum teksid block with is probably the best aluminum block you can get.

limited

· #18 · Dec 17, 2009

KB discontinued the intake/ blower set-up for the b heads, had a problem with cracking I believe. I would also get the 4v block(alum. or iron), not that expensive and it is stronger

norcalam2

· #19 · Dec 17, 2009

Navi heads are pretty cheap...

dcook_14

· #20 · Dec 17, 2009

limited said:
KB discontinued the intake/ blower set-up for the b heads, had a problem with cracking I believe. I would also get the 4v block(alum. or iron), not that expensive and it is stronger

KB Superchargers

They still list a blower for a 96-98 Cobra, which would have B heads. A teksid or an iron block is gonna handle any streetable power you throw at it. I'd go with aluminum just for weight savings.

LGHTNG02GT said:
well, im pretty sure the blocks are essentially the same. the only thing i could see being different is maybe the coolant passages into the heads but im not positive on this. your GT block is iron. its strong but heavy. the termi's had iron blocks too. the mach 1's and 01 cobra's had an aluminum block and 98-96 cobra's and i think the 99's too had the aluminum teksid block with is probably the best aluminum block you can get.

I'm pretty sure the coolant passages are the same, but yeah that'd be a good thing to make sure on. Some of the 01 cobras came with leftover teksids, but most of them got the WAP aluminum block.

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