• Mustang Forums
  • 1965 - 1973 Classic Mustangs -General/Talk-

1 7/8" headers into 3"

  • Thread starter Thread starter jws66m
  • Start date Start date Sep 21, 2021
J

jws66m

Member
Oct 5, 2018
47
7
18
Utah
Sep 21, 2021
#1
  • Sep 21, 2021
  • #1
Has anyone had any luck getting 1 7/8 headers into a 1965/66. I'm not looking to cut shock towers. I don't mind if they are 100% custom. Everyone out there seems to only be able to get 1 3/4 in there. I'm deciding on my engine config and its going to be high revving and at least 600hp.
 

wicked93gs

15 Year Member
Sep 30, 2006
1,198
229
93
Nashville TN
Sep 21, 2021
#2
  • Sep 21, 2021
  • #2
If you are talking 600+ HP, perhaps you should build your own? I built my own, it allowed me to configure the headers exactly as I wanted for my desired powerband. It also lets you make actual equal length headers(which 90% of headers on the market are not) with true merge collectors(again 90% of the headers do not have) with v-band flanges(instead of the cheap 3 bolt flanges). In the end building my headers took about 3 days of labor, but it was well worth the effort spent, I got my pieces here:

Megs Exhaust Warehouse-Exhaust Systems, Exhaust Collectors, Components, Exhaust Conical, Mufflers, Exhaust Tips

Manufacturer of aftermarket exhaust for automotive, motorcycle and marine since 1970. High quality fabrication of exhaust components & kits. American-made USA exhaust tips.
www.coneeng.com

They have a DIY merge collector kit that is a thing of beauty.
 
Reactions: 427nostang
4

427nostang

Member
Jun 4, 2026
17
3
13
Santa Clara
Jun 4, 2026
#3
  • Jun 4, 2026
  • #3
wicked93gs said:
If you are talking 600+ HP, perhaps you should build your own? I built my own, it allowed me to configure the headers exactly as I wanted for my desired powerband. It also lets you make actual equal length headers(which 90% of headers on the market are not) with true merge collectors(again 90% of the headers do not have) with v-band flanges(instead of the cheap 3 bolt flanges). In the end building my headers took about 3 days of labor, but it was well worth the effort spent, I got my pieces here:

Megs Exhaust Warehouse-Exhaust Systems, Exhaust Collectors, Components, Exhaust Conical, Mufflers, Exhaust Tips

Manufacturer of aftermarket exhaust for automotive, motorcycle and marine since 1970. High quality fabrication of exhaust components & kits. American-made USA exhaust tips.
www.coneeng.com

They have a DIY merge collector kit that is a thing of beauty.
Click to expand...
How did you fix your problem? with the headers
 
4

427nostang

Member
Jun 4, 2026
17
3
13
Santa Clara
Aug 7, 2026
#4
  • Aug 7, 2026
  • #4
jws66m said:
Has anyone had any luck getting 1 7/8 headers into a 1965/66. I'm not looking to cut shock towers. I don't mind if they are 100% custom. Everyone out there seems to only be able to get 1 3/4 in there. I'm deciding on my engine config and its going to be high revving and at least 600hp.
Click to expand...
What engine are you running and how many horse power? I have to have mine custom made. Are you running cut outs?
 

DadLife0724

Active Member
Mar 22, 2024
340
238
53
Cooperstown, PA
Aug 7, 2026
#5
  • Aug 7, 2026
  • #5
Good luck man. That guy hasn't been on since Dec. 2021.
 
Reactions: 427nostang
4

427nostang

Member
Jun 4, 2026
17
3
13
Santa Clara
Aug 7, 2026
#6
  • Aug 7, 2026
  • #6
427nostang said:
How did you fix your problem? with the headers
Click to expand...
thanks for the info., I have a 1 5/8 ths on til I get it to a shop. I have power rack which interferes with other headers. and ordering them so I need to have them custom made a shop. thanks
 
4

427nostang

Member
Jun 4, 2026
17
3
13
Santa Clara
Aug 7, 2026
#7
  • Aug 7, 2026
  • #7
427nostang said:
thanks for the info., I have a 1 5/8 ths on til I get it to a shop. I have power rack which interferes with other headers. and ordering them so I need to have them custom made a shop. thanks
Click to expand...
I have RRS coil over strut front suspension with shock tower removed
 
4

427nostang

Member
Jun 4, 2026
17
3
13
Santa Clara
Aug 7, 2026
#8
  • Aug 7, 2026
  • #8
427nostang said:
I have RRS coil over strut front suspension with shock tower removed
Click to expand...
I live in California. I was looking to find some place to drive to with in 200 miles. I have to brake in my clutch and new brakes.
 
4

427nostang

Member
Jun 4, 2026
17
3
13
Santa Clara
Aug 7, 2026
#9
  • Aug 7, 2026
  • #9
427nostang said:
How did you fix your problem? with the headers
Click to expand...
thank you for the information. I will be calling Cone Engineering.
 
4

427nostang

Member
Jun 4, 2026
17
3
13
Santa Clara
Aug 7, 2026
#10
  • Aug 7, 2026
  • #10
wicked93gs said:
If you are talking 600+ HP, perhaps you should build your own? I built my own, it allowed me to configure the headers exactly as I wanted for my desired powerband. It also lets you make actual equal length headers(which 90% of headers on the market are not) with true merge collectors(again 90% of the headers do not have) with v-band flanges(instead of the cheap 3 bolt flanges). In the end building my headers took about 3 days of labor, but it was well worth the effort spent, I got my pieces here:

Megs Exhaust Warehouse-Exhaust Systems, Exhaust Collectors, Components, Exhaust Conical, Mufflers, Exhaust Tips

Manufacturer of aftermarket exhaust for automotive, motorcycle and marine since 1970. High quality fabrication of exhaust components & kits. American-made USA exhaust tips.
www.coneeng.com

They have a DIY merge collector kit that is a thing of beauty.
Click to expand...
I can not weld. wish I could.
 

bikefreak600

Member
Dec 10, 2005
157
2
19
rochelle IL
Aug 16, 2026
#11
  • Aug 16, 2026
  • #11
427nostang said:
How did you fix your problem? with the headers
Click to expand...
In my 65 with 408w 640hp I custom fabricated 4-2-1 nascar style headers 1-7/8 primary merged to twin 2-1/4 secondary merged to a 3'' collector. It took a lot of fabrication, had to notch my towers etc. I did not want a sharp bend in the primaries coming off the head, cuz that is required with stock shock towers.

I think your only solution is to have a set custom fabricated.

For what its worth, I have about $1200 in materials alone just to build my headers, flanges, bends, choke collectors, etc all 304 stainless, plus a month of fabrication. So paying $2-3k for a set of nice custom headers is not that bad of a deal as long as the quality is there
 
4

427nostang

Member
Jun 4, 2026
17
3
13
Santa Clara
Aug 17, 2026
#12
  • Aug 17, 2026
  • #12
bikefreak600 said:
In my 65 with 408w 640hp I custom fabricated 4-2-1 nascar style headers 1-7/8 primary merged to twin 2-1/4 secondary merged to a 3'' collector. It took a lot of fabrication, had to notch my towers etc. I did not want a sharp bend in the primaries coming off the head, cuz that is required with stock shock towers.

I think your only solution is to have a set custom fabricated.

For what its worth, I have about $1200 in materials alone just to build my headers, flanges, bends, choke collectors, etc all 304 stainless, plus a month of fabrication. So paying $2-3k for a set of nice custom headers is not that bad of a deal as long as the quality is there
Click to expand...
Thank you so much for your help. I have come on this site to find help. I came here for help. And mostly have been insulted. I am in California where did you have your header built? I do have my shock tower notched out. I have RRS front coil overs. And total control power rack. I was hoping to find someone with the same set up. That was successful with this set up and maybe had a jig or measurements for assembly .
 
F

fasterthangas

Active Member
Oct 5, 2016
267
77
38
Phoenix
Aug 17, 2026
#13
  • Aug 17, 2026
  • #13
Here you go...
https://www.vintage-mustang.com/thr...1211175/?utm_source=google&utm_medium=organic
 
You must log in or register to reply here.

Similar threads

4
1965 mustang 351 850 hp+ primary tubes 1 7/8 or larger and a 3 inch or larger collectors?
  • 427nostang
  • Jun 4, 2026
  • 1965 - 1973 Classic Mustangs -General/Talk-
  • 2
Replies
29
Views
658
1965 - 1973 Classic Mustangs -General/Talk- Aug 7, 2026
DadLife0724
New Exhaust for 408w stroker
  • SadbutTrue
  • Sep 10, 2026
  • 1965 - 1973 Classic Mustangs -General/Talk-
Replies
1
Views
67
1965 - 1973 Classic Mustangs -General/Talk- Sep 10, 2026
nickyb
Exhaust 1 3/4” Long Tubes on a Fox Body AOD – Easiest route?
  • 5.0 Mike
  • Mar 19, 2025
  • Fox 5.0 Mustang Tech
Replies
6
Views
2K
Fox 5.0 Mustang Tech Mar 21, 2025
5.0 Mike
J
For Sale MASTER LISTING: Abandoned '66 Mustang Restomod Part-Out (Wilwood, Ididit, Quick Performance, Mishimoto)
  • JasonB66
  • Jul 23, 2026
  • Suspension
Replies
0
Views
205
Suspension Jul 23, 2026
JasonB66
J
A
2001 Mustang GT, scorched metal smell and noise from trans/diff?
  • AndyE2255
  • Dec 1, 2025
  • SN95 4.6L Mustang Tech
Replies
4
Views
519
SN95 4.6L Mustang Tech Dec 28, 2025
gkomo
Share:
Bluesky Email Share Link
  • Mustang Forums
  • 1965 - 1973 Classic Mustangs -General/Talk-
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?