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  • 1996 - 2004 SN95 Mustang -General/Talk-

5.4l crank?

  • Thread starter Thread starter 96stangfl
  • Start date Start date Oct 12, 2021
9

96stangfl

Member
Apr 21, 2020
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1
8
Clearwater FL
Oct 12, 2021
#1
  • Oct 12, 2021
  • #1
Here's the age old question. I'm not a fan of the 4.6l bore path. Considered stroking, but that lead to another question. Ford introduced a 5.4l. Basically a supersized 4.6l. I like the build quality of the GT500 crank with a 5.4l. Almost all mention rod length. Never once considered getting longer rods. Actually just upgrading to cobra. Some posts mention shaving on the bottom bore. Does anyone know if the angle comes into play on the 4.6l? I feel like rod journals and counterweights aren't a deal breaker. How can we make just the crank work with 4.6l connecting rods. Don't cheap out and lecture the community on tranny related issues.
 
C

ClayBelt

Member
Feb 21, 2020
71
6
18
Leon County, FL
Oct 12, 2021
#2
  • Oct 12, 2021
  • #2
The blocks are different between the two, you’d need the counterweights shaved down, shorter rods than the 4,6 uses, and at the end of the day you’d have a very unsatisfactory engine that you spent too much money on Trying to shove that in a 4.6 block. If you want a 5.4 gotta use a 5.4 block
 

Hoytster

I don't dare do that to my Knob
20+ Year Stangneter
Dec 30, 2002
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Cornwall, PA
Oct 12, 2021
#3
  • Oct 12, 2021
  • #3
Crank needs offset ground and resized, counterweights need to be machined down 1/4" on the crank, lower bored needs to be clearanced for the rod swing, and custom rods and pistons are needed. Rod ratio is crappy, piston pulls out of the bottom of the bore quite a bit, and not very rev friendly. There is a reason nobody does this.
 
9

96stangfl

Member
Apr 21, 2020
37
1
8
Clearwater FL
Oct 14, 2021
#4
  • Oct 14, 2021
  • #4
Shaving the countetweights seemed to be the big hurdle. The wish was of course to get a high quality crank without changing anything else. I appreciate the interest, what dreams may come, right?
 
9

96stangfl

Member
Apr 21, 2020
37
1
8
Clearwater FL
Oct 14, 2021
#5
  • Oct 14, 2021
  • #5
Was that the rods to make 272?
 

manicmechanic007

5 Year Member
Sep 26, 2017
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Roy, Utah
Oct 15, 2021
#6
  • Oct 15, 2021
  • #6
When racing there is a saying
Run what you brung
That 4.6 runs good enough and is one of the better ford plants
5.4 on the other hand is a great and powerful big problem motor that put my kids thru college
 

manicmechanic007

5 Year Member
Sep 26, 2017
2,526
711
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Roy, Utah
Oct 15, 2021
#7
  • Oct 15, 2021
  • #7
Supercharged 5.4 is a great motor IMHO
You just have to have a guy like me on retainer
You could not give me an eco boost at this point
And a 3.9 diesel? Another Edsel so far
 
9

96stangfl

Member
Apr 21, 2020
37
1
8
Clearwater FL
Oct 15, 2021
#8
  • Oct 15, 2021
  • #8
I plan on going dish to get rev back to 8, is there a clear crank option is what this build has turned into.
 
9

96stangfl

Member
Apr 21, 2020
37
1
8
Clearwater FL
Oct 15, 2021
#9
  • Oct 15, 2021
  • #9
Some of your might prefer dome pistons shorter rods, and treat it like a Cleveland. But I don't think it'd go much past 7500 rpms.
 
9

96stangfl

Member
Apr 21, 2020
37
1
8
Clearwater FL
Oct 16, 2021
#10
  • Oct 16, 2021
  • #10
Please remember I'm not trying to add dispacement to the 4.6, it's notoriously bad for that. Can it be done yes, will it be a track car if stroked, clearly not.
 
9

96stangfl

Member
Apr 21, 2020
37
1
8
Clearwater FL
Jan 10, 2022
#11
  • Jan 10, 2022
  • #11
Tell me if I'm wrong here, but for the GT flywheel parts are going to rack up by switching to 8-bolt main. If I could I would use the Cobra connecting rods on that 2011 GT500 crank for the 5.4l, with the PI correct -18cc dish pistons. How, is that not Ford having our back?
 

Bullitt347

I have been doing it wrong this whole time
15 Year Member
Mar 23, 2007
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Jan 10, 2022
#12
  • Jan 10, 2022
  • #12
Just use the Steel crank out of a 4.6 Cobra.
 
9

96stangfl

Member
Apr 21, 2020
37
1
8
Clearwater FL
Jan 12, 2022
#13
  • Jan 12, 2022
  • #13
I like that idea, but then I would want shorter rods and hemi pistons. I think others would go flat and blower mount with a destroked setup.
 
G

Green mustang

New Member
Jun 10, 2025
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Ganado
Jun 14, 2025
#14
  • Jun 14, 2025
  • #14
I got a question also, can a 4.6L 3v mustang stock rods and piston work with the 5.4L 3v crankshaft and block?
 

Noobz347

Stangnet Facilities Maint Tech... Er... Janitor
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#15
  • Jun 16, 2025
  • #15
Green mustang said:
I got a question also, can a 4.6L 3v mustang stock rods and piston work with the 5.4L 3v crankshaft and block?
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