• Mustang Classifieds
  • Classic Mustangs For Sale
  • Engine and Power Adder

Mild 289 Build For 1966 Mustang Coupe

  • Thread starter Thread starter roy mccarthy
  • Start date Start date Sep 1, 2012
Status
Not open for further replies.
R

roy mccarthy

New Member
Sep 1, 2012
2
0
1
Sep 1, 2012
#1
  • Sep 1, 2012
  • #1
My 15 year old daughter and I are working on her project car; a 1966 Mustang coupe with a C code 289. Im looking for advice/suggestions for a rebuild. I have read a bunch of what seems like common threads but it always turns into getting a 351 or convert to a 347. Keep in mind its for a teenage girl and her "first car".

That being said I'd like to keep the original 289 in the car, with a stock c4 transmission, 3.25 open 8 inch rear end. I'm upgrading the brakes to CSRP and a few other things to make it more safer. The machine shop says the 289 heads will not be cost effective to put new guides/ screw in studs / hardened exhhaust seats, etc and I may be better with a different head. Ive been eyeing a set of aluminum SVO heads off a 95 mustang cobra (perhaps). I want this to be a fun car that can get out of its own way but nothing that will be drag raced or street raced (i hope).

Im looking for your advice on components as the 289 seems cubic inch limited and it seems with the wrong combination of parts this can be a very poor running car. I dont want to strap on a set of race heads or some wildly tuned engine that runs only when its abov 60 degrees farenheit! no nitrous but just a reliable, fun and spunky car to drive.

Thanks guys.
 
6

65Coupe351

New Member
Jul 3, 2010
4
0
1
Sep 4, 2012
#2
  • Sep 4, 2012
  • #2
roy mccarthy said:
My 15 year old daughter and I are working on her project car; a 1966 Mustang coupe with a C code 289. Im looking for advice/suggestions for a rebuild. I have read a bunch of what seems like common threads but it always turns into getting a 351 or convert to a 347. Keep in mind its for a teenage girl and her "first car".

That being said I'd like to keep the original 289 in the car, with a stock c4 transmission, 3.25 open 8 inch rear end. I'm upgrading the brakes to CSRP and a few other things to make it more safer. The machine shop says the 289 heads will not be cost effective to put new guides/ screw in studs / hardened exhhaust seats, etc and I may be better with a different head. Ive been eyeing a set of aluminum SVO heads off a 95 mustang cobra (perhaps). I want this to be a fun car that can get out of its own way but nothing that will be drag raced or street raced (i hope).

Im looking for your advice on components as the 289 seems cubic inch limited and it seems with the wrong combination of parts this can be a very poor running car. I dont want to strap on a set of race heads or some wildly tuned engine that runs only when its abov 60 degrees farenheit! no nitrous but just a reliable, fun and spunky car to drive.

Thanks guys.
Click to expand...
 
6

65Coupe351

New Member
Jul 3, 2010
4
0
1
Sep 4, 2012
#3
  • Sep 4, 2012
  • #3
Hello , I have a complete valvetrain to make power from stock heads with minor mods. I have a set of NOS 1969 GT 40 valves , double springs ,retainers and locks. Part mnumbers: Intake valve C90Z-6507-AA, Exhaust valve C90Z-6505-AA,Springs C3AZ-6513-B,retainers C90Z-6514-D, and Locks C9ZZ-6518-A. These are in NOS Ford boxes, and with the right cam and intake carb combo are said to produce a lot of HP!. Call me at 336-452-2185 for details
 
R

roy mccarthy

New Member
Sep 1, 2012
2
0
1
Sep 4, 2012
#4
  • Sep 4, 2012
  • #4
I dont know my small block ford heads as I'm normally an FE engine person, but what is considered "minor mods" would just the valves/springs make more power? It seems to my the exhaust ports are somewhat restricted and would at least require some cleanup to make all of the others stuff really work. I never drove the car as it was a project when bought so I dont have a feel for what the stock motor was like originally to drive. what kind of HP gain would I see over the stock 200 hp?
 
6

65Coupe351

New Member
Jul 3, 2010
4
0
1
Sep 4, 2012
#5
  • Sep 4, 2012
  • #5
you would need some intake and exhaust work, new larger seats for these valves I have.
 
Status
Not open for further replies.

Similar threads

H
1966 mustang starter and pulley troubles
  • Hotrods4ray
  • Sep 24, 2025
  • 1965 - 1973 Classic Mustangs -General/Talk-
Replies
6
Views
376
1965 - 1973 Classic Mustangs -General/Talk- Jan 10, 2026
Realmongo
A
Discussion on mild budget build/ top end
  • Acesario
  • Feb 21, 2026
  • 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk-
  • 2
Replies
20
Views
734
1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- Feb 23, 2026
General karthief
D
Brakes 1966 Mustang convertible 289, Auto - Disc brake conversion issues
  • DRGunn427
  • Feb 26, 2025
  • Classic Mustang Specific Tech
Replies
5
Views
678
Classic Mustang Specific Tech Jul 23, 2026
All Stock93
6
Hey all,I’m putting together a 302 for my 1968 Mustang and wanted to post the combo + some questions to make sure I’m not missing crucial
  • 68_Disgustang
  • Feb 22, 2026
  • 1965 - 1973 Classic Mustangs -General/Talk-
Replies
4
Views
900
1965 - 1973 Classic Mustangs -General/Talk- Jun 20, 2026
gray owl
G
S
65 Coupe I6 Auto to 302 EFI 5 Speed Swap
  • Scuderia
  • Feb 3, 2025
  • 1965 - 1973 Classic Mustangs -General/Talk-
Replies
14
Views
1K
1965 - 1973 Classic Mustangs -General/Talk- Sep 9, 2025
Noobz347
Share:
Bluesky Email Share Link
  • Mustang Classifieds
  • Classic Mustangs For Sale
  • Engine and Power Adder
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?