• Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • Fox 5.0 Mustang Tech

81' stang w/ 351w questions

  • Thread starter Thread starter 81stang351w
  • Start date Start date Aug 19, 2011
8

81stang351w

New Member
Aug 5, 2011
6
0
0
Alexandria, MN
Aug 19, 2011
#1
  • Aug 19, 2011
  • #1
Hey everybody,
I have a 81' stang with a 351w project I am in the middle of, I am working on getting 400bwhp. I am trying to keep it in a reasonable budget as well. stats: roller 351w carb, gt40 heads, bbk headers, mild cam, c4 tranny w/ 2200 stall stage 2 kit, high rise intake,750 holley double pumper, fresh build on the whole motor. I am also doing all the nuts and bolts stuff myself, it will visit the track occasionally but will be mostly a street stang. I would look at getting a bigger stall, radiator, heads, etc. I also looked into the nitrous option, and have experience with it, but am not sure what the windsor can take. any idea's and suggestions would be much appreciated!! thank you very much. also the rear end is 3.55 gears with posi, (rear out of a thunderbird), 2" lowered, factory suspension, I know i will also need to update the suspension with coilovers any suggestions would be great also!! thanks!!
 

NIKwoaC

中國製造
15 Year Member
Oct 31, 2006
5,525
943
214
Chengdu Province
Aug 19, 2011
#2
  • Aug 19, 2011
  • #2
Definitely going to need better heads than those GT40s to reach your goals. I would be considering a head that flows 300CFM or better by .600" lift, and those 40s aren't even coming anywhere near that.

Get yourself a good cylinder head, then find someone to grind a custom cam for you. Tell them your goals and they will help you get there.

I don't know much about carbs, maybe someone else can chime in there.

If you're planning on spraying it, or going with any means of forced induction, you'll need forged pistons. Stock 351 pistons are cast and they won't hold up to much. That said, the rest of the 351 if pretty tough, and I've seen the blocks handle 700hp and up. After the pistons, the next weak link are the rods, so keep that in mind, too.
 
8

81stang351w

New Member
Aug 5, 2011
6
0
0
Alexandria, MN
Aug 21, 2011
#3
  • Aug 21, 2011
  • #3
I was checking out the Aluminum ford racing heads or the trick flow twisted wedge, and definately planned on dumping the sufficating gt40s. what kind off pistons would you recommend and anybody know what volume of spray the motor can handle with different pistons and rods? thanks for the replys so far, still looking for any help info, thanks!!
 

ID89GT

10 Year Member
May 26, 2008
1,659
18
49
Spokane Valley, WA
Aug 22, 2011
#4
  • Aug 22, 2011
  • #4
I would call someone and pretty much tell them what you want and what they recommend to get there. Rick would probably help out a lot
 

gearheadboy

15 Year Member
Jan 15, 2003
1,425
177
84
Greencastle Pa
Aug 25, 2011
#5
  • Aug 25, 2011
  • #5
Is the motor really in the car yet? I'm curious about a windsor with those heads and swap headers. What are you using if it is in there and if it isn't, have you thought about that?
 
8

86bluecobra

Advanced Member
Dec 20, 2004
4,265
12
69
B.C. Canada
Sep 24, 2011
#6
  • Sep 24, 2011
  • #6
Personally I would be looking for a used set of Vic jr heads for a project like that. had a set of holley heads on my 351w with a dual plane intake when I went to Vic jr top end I picked up 6 mph. I am using the same cam. Don't skimp on heads they are wants going to help you make the most power out of the engine.
 

Rick 91GT

Mustang Master
Nov 29, 1999
9,692
95
99
PA
Sep 24, 2011
#7
  • Sep 24, 2011
  • #7
I personally would look into a 200cc+ which will work fine now and in the future. The 750 is a little large right now...
 

Rick 91GT

Mustang Master
Nov 29, 1999
9,692
95
99
PA
Sep 24, 2011
#8
  • Sep 24, 2011
  • #8
If you need help with parts or some recomendations let me know if I can help.

Rick
Owner/ Operator RNH Performance
Rnhperformance1@gmail.com
 
8

86bluecobra

Advanced Member
Dec 20, 2004
4,265
12
69
B.C. Canada
Sep 24, 2011
#9
  • Sep 24, 2011
  • #9
Rick 91GT said:
I personally would look into a 200cc+ which will work fine now and in the future. The 750 is a little large right now...
Click to expand...

what really is the downside of over carb'ing? Is it just idle issues? I have seen dyno runs where numerous carbs were tried up to 1050's and once the motor made peak power the bigger carb's just made the same power as the smaller carbs. Just curious.
 

Rick 91GT

Mustang Master
Nov 29, 1999
9,692
95
99
PA
Sep 24, 2011
#10
  • Sep 24, 2011
  • #10
If a carb is to large you end up putting large jets in to pull on the carb hard enough.

Fwiw- I had a 408 on the engine dyno with a 750 holley and pulled 4 jet sizes down...very efficent motor made 539/589.
 
8

86bluecobra

Advanced Member
Dec 20, 2004
4,265
12
69
B.C. Canada
Sep 24, 2011
#11
  • Sep 24, 2011
  • #11
OK sorry for my ignorance but I'm curious what you mean by pulling on the carb hard enough.
 

Rick 91GT

Mustang Master
Nov 29, 1999
9,692
95
99
PA
Sep 24, 2011
#12
  • Sep 24, 2011
  • #12
To get the proper signal for the fuel circuits.
 
You must log in or register to reply here.

Similar threads

R
What's it Worth? 1997 Cobra, a ton of mods and restoration
  • riored97snake
  • Jun 18, 2026
  • What is it Worth?!?!?
Replies
2
Views
169
What is it Worth?!?!? Jun 21, 2026
riored97snake
R
Engine HELP - 351W Based Build Under Stock Hood
  • thinkfaster
  • Oct 17, 2024
  • Fox 5.0 Mustang Tech
Replies
13
Views
2K
Fox 5.0 Mustang Tech Dec 31, 2025
Qtrhrse23
Q
Drive Shaft/Rear Diff Issue on 2014 GT
  • DudeStang
  • Jun 16, 2025
  • 2010 - 2014 Specific Tech
Replies
11
Views
1K
2010 - 2014 Specific Tech Jan 21, 2026
gkomo
SOLD SOLD!!!! 1993 Notchback Roadracer For Sale. She's a beast!
  • Boydster
  • Apr 25, 2025
  • Fox Body Mustangs For Sale (1979-93)
Replies
0
Views
1K
Fox Body Mustangs For Sale (1979-93) Apr 25, 2025
Boydster
Wheels-Tires LS mii swap and rear rim size/axle questions....
  • 78mIIman
  • Feb 2, 2025
  • 1974 - 1978 Mustang II Talk & Tech
Replies
6
Views
735
1974 - 1978 Mustang II Talk & Tech May 6, 2025
78 Mach1
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • Fox 5.0 Mustang Tech
Menu
Log in

Register

  • Forums
  • What's new
  • Media
  • Resources
  • Contact
  • Sponsor
X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?

X

Privacy & Transparency

We use cookies and similar technologies for the following purposes:

  • Personalized ads and content
  • Content measurement and audience insights

Do you accept cookies and these technologies?