DOHC 5.4 swap? worth it?

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Saleen4971

New Member

Mar 26, 2003

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Setauket, LI

Sep 7, 2006

#1

• Sep 7, 2006

• #1

is it possible, and worthwhile to swap a 5.4 DOHC motor in place of the 2V 4.6? how much heavier are they? i assume there woudl be PCM modifications (if nto PCM and harness replacement).

or would a 4.6 DOHC swap be a better idea? any mods other than the motor swap necessary? when i sell my jeep i was GOING to put some $$$ towards payingoffmy loan, BUT if i can get enough money i might jstu build up a DOHC 4.6 (or stroker?)

 

madmatt

Ellis Juan sympathizer

Founding Member

Dec 28, 2002

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Lexington, SC

Sep 8, 2006

#2

• Sep 8, 2006

• #2

My advice, pay of the loan. No sense in staying in debt and building a motor, you NEVER know what will happen with a built motor and you could very possibly burn a piston up and have another 4k in debt right there, BUT, if you really want to build it, why not stick with the 2v head? Whats the point of switching to the 4v head when the 2v's are making PLENTY of power with a blower and ported heads/cams. Just my advice, take it or leave it.

 

B

BaXTeR3221

Member

Jan 12, 2004

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Orange County, NY

Sep 8, 2006

#3

• Sep 8, 2006

• #3

I think its a good idea for the wow factor, but performance-wise, its prolly more work than it's worth. I would stay with a 2v head and maybe just get a stroker kit. This way you can get a stronger block and turn up the boost.

 

stangGT97

New Member

Dec 22, 2004

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Boston area, MA

Sep 8, 2006

#4

• Sep 8, 2006

• #4

pay off the loan...

 

BooWFO

New Member

May 10, 2005

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Louisville, KY

Sep 8, 2006

#5

• Sep 8, 2006

• #5

5.4l DOHC FTW

Really a build 5.4 dohc would have so much more low end grunt and top end power compared to a 4.6 sohc it's funny.

 

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Saleen4971

New Member

Mar 26, 2003

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Setauket, LI

Sep 8, 2006

#6

• Sep 8, 2006

• #6

im leaning towards picking up an 03/04cobra motor. i LOVE the sound of the DOHC motors, and i see a LOT of terminator guys using stock bottom end, making 600rwhp easily.

BUT, 3 grand for a motor, vs. building a 4.6 or 5.0 SOHC - ill have to research it a little bit. i dotn want to blow all of my $$$ on it. possible to build a forged bottom end for sub-3k? how about with cams/heads? im sure i could find a set of used ported heads for about a grand or less. any links you guys can supply me with? getting toasted by that KB'd C5 vette last night has me wanting more...

 

jasonh_86

I

May 20, 2005

1,156

2

48

Arkansas

Sep 8, 2006

#7

• Sep 8, 2006

• #7

Do a forged 4.6L 2V.. but if you want a different motor then get a VT Engines 324ci BB/Stroker.

Our motors have enough stroke as-is, just add some more bore to it!

 

RedDaemon

10 Year Member

Mar 31, 2005

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Atlanta, GA

Sep 9, 2006

#8

• Sep 9, 2006

• #8

how much bore..thats the question

 

jivepepper

Founding Member

Jun 19, 2002

776

5

18

Under a Sombrero. in WV.

Sep 9, 2006

#9

• Sep 9, 2006

• #9

Saleen4971 said:

im leaning towards picking up an 03/04cobra motor. i LOVE the sound of the DOHC motors, and i see a LOT of terminator guys using stock bottom end, making 600rwhp easily.

BUT, 3 grand for a motor, vs. building a 4.6 or 5.0 SOHC - ill have to research it a little bit. i dotn want to blow all of my $$$ on it. possible to build a forged bottom end for sub-3k? how about with cams/heads? im sure i could find a set of used ported heads for about a grand or less. any links you guys can supply me with? getting toasted by that KB'd C5 vette last night has me wanting more...

Click to expand...

What sound is that?

 

S

Saleen4971

New Member

Mar 26, 2003

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Setauket, LI

Sep 9, 2006

#10

• Sep 9, 2006

• #10

the 4V exhaust tone IMO is nicer than the 2V. comparing my GT (or any GT forthat matter) to my friends 97 cobra

 

nwapache

New Member

Jun 27, 2006

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Seattle,WA

Sep 9, 2006

#11

• Sep 9, 2006

• #11

wow, you can get an 03/04 cobra motor for 3k??? i'd snap that up in a heartbeat!

 

Henceforward

The Avatar Master

Founding Member

Jul 17, 2001

485

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0

Sep 9, 2006

#12

• Sep 9, 2006

• #12

Saleen4971 said:

When I sell my Jeep I was GOING to put some $$$ towards paying off my loan.

Click to expand...

Best idea right there...

 

fastangboi

My first set of nuts vibrated themselves off.

Jul 26, 2006

274

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Slowville

Sep 9, 2006

#13

• Sep 9, 2006

• #13

jasonh_86 said:

Do a forged 4.6L 2V.. but if you want a different motor then get a VT Engines 324ci BB/Stroker.

Our motors have enough stroke as-is, just add some more bore to it!

Click to expand...

+1 bore it

 

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Torinalth

Founding Member

Jul 16, 2002

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Clayton NC

Sep 9, 2006

#14

• Sep 9, 2006

• #14

the 5.4, while nice, takes a load and a half of money to mak the power you will want to with it. its an awesome idea, but you will be in the motor for 7k before power mods... i am not joking. i gave up on the idea once my spec was around 420 RWHP and 17k.... lots of money.

Torinalth