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  • 1996 - 2004 SN95 Mustang -General/Talk-
  • SN95 4.6L Mustang Tech

SOHC conversion to DOHC

  • Thread starter Thread starter DonMaximo
  • Start date Start date Nov 11, 2009
D

DonMaximo

Member
Sep 25, 2003
217
5
19
Lewisville, Texas
Nov 11, 2009
#1
  • Nov 11, 2009
  • #1
- I'm a newbie to this modular engine technology.
- We have an aging 2001 GT (80K - still alot of live let to it)
- I'd like to educate myself on the details of converting from a
naturally aspirated 4.6 SOHC to a 5.4 DOHC (rebuild).
- The purpose of this thread is to find resources in which I can answer questions related to this conversion and following considerations:

- Reuse existing (rebuilt) Automatic transmission
Will the 5.4 engine fasten to the existing transmission (housing/shaft/converter) ?

- PCM
Can the stock unit be used or should I consider grabbing the unit with the used engine ?

- Motor mounts
Are the the same ?

- Exhaust
What changes if necessary to hook up with the existing stock system ?

- Engine compartment clearance considerations



Thanks in advance.

-D
 

billfisher

Active Member
Jul 17, 2005
1,296
4
38
huntsville, AL
Nov 11, 2009
#2
  • Nov 11, 2009
  • #2
a search will answer most questions.

4.6 oil pan
navi lower with kar kraft upper
same mounts
your pcm
there are no headers that will fit
use 4v manifolds (03-04)
clock the hydro booster to clear
8 bolt flex plate
your tranny
cowl hood
 

ChillPhatCat

20+ Year Stangneter
Apr 22, 2002
409
65
48
Syracuse, NY
Nov 12, 2009
#3
  • Nov 12, 2009
  • #3
Probably not what you want to hear, but going 4.6 to 5.4 will not get you much power and it's quite a bit of work. You would end up spending less money and time dropping a blower on top of that engine and gain more power.
 

bhuff30

Founding Member
Dec 11, 2001
6,037
35
129
Olathe KS
Nov 12, 2009
#4
  • Nov 12, 2009
  • #4
Yup, I would agree that the 5.4 isn't really worth it. You'll get some nice additional low and midrange torque, but the peak power will be similar to a nice NA 4.6 combination. The 5.4 intake options and poor bore to stroke ratio limit the potential power.
 
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