Exhaust Manifold bolts

Mystang66

Member

Jul 23, 2011

76

16

19

Minneapolis, MN

Feb 16, 2020

#1

• Feb 16, 2020

• #1

I have a 1977 Mustang II Ghia. I’ve refurbished the original exhaust manifolds that came with the car, but they were off the car when I purchased it and I can’t find the bolts. I’ve searched online and can’t seem to find any info on a bolt kit to fit this. Anyone have info on where I can find these? I believe the bolts holes are 3/8, but the manifold holes are much bigger. It looks like they may need a sleeve of some sort for the bolts to fit.

 

LILCBRA

I wish I didn't have all of these balls in the air

Mod Dude

Dec 6, 2005

6,362

5,341

194

Corn County USA

Feb 17, 2020

#2

• Feb 17, 2020

• #2

I'm pretty sure no one makes a kit specifically for the MII, but exhaust bolts shouldn't be too hard to find. You could order a kit and/or a couple different bolt kits
for an older Mustang or something, match what you actually need and use those. OR..... if it were me, I'd buy the correct size threaded rod, make studs and install the manifolds on them. I'd also use some anti-seize on both the stud itself and the nuts I used. Not necessarily an option if you're looking to keep it original or NOS or anything though....

https://www.cjponyparts.com/amk-products-exhaust-manifold-bolt-set-289-302-1968-1970/p/EXMB5/?year=1968&gclid=Cj0KCQiAkKnyBRDwARIsALtxe7hXOldMyS7sgpZ1s--1q-ZxK9p3TlJw2xRouXa2qDvpqHDMCEZtffwaAn6oEALw_wcB

 

2Blue2

will be trying this sex one when I can find it

Mod Dude

Mar 5, 2019

4,430

2,893

163

Oahu

Feb 17, 2020

#3

• Feb 17, 2020

• #3

The manifold bolt holes on mine seemed a little big also but I think you need that room because the iron moves around with heat cycles.

 

J

jimbob

Member

Mar 23, 2009

21

28

23

Dec 30, 2021

#4

• Dec 30, 2021

• #4

hi just noticed your post,i am up against the same thing.my motor motor never had the manifolds on it.so now up against the same problem.did you have any luck finding the bolts.

 

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extra_stout

5 Year Member

Aug 27, 2018

821

933

113

Germany

Dec 31, 2021

#5

• Dec 31, 2021

• #5

@2Blue2 said, that he thinks the bigger bolt holes are needed for heat expansion (exhaust manifold is hotter than cylinder head; manifold will expand more). The diameter/size of the bolt is defined by thread size in the cylinder head and they are the same for all bolts. Just buy bolts in the right length and don't mind about the bigger bolt holes.
You can see on your last picture that the impress of the bolt head has the same diameter on both (small and big bore)...

 

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LILCBRA

I wish I didn't have all of these balls in the air

Mod Dude

Dec 6, 2005

6,362

5,341

194

Corn County USA

Dec 31, 2021

#6

• Dec 31, 2021

• #6

I think the link I shared in my post above would be fine.

 

Reactions: 2Blue2

J

jimbob

Member

Mar 23, 2009

21

28

23

Dec 31, 2021

#7

• Dec 31, 2021

• #7

ok guys thank you for the quick responce. great help.

 

Reactions: extra_stout, 2Blue2 and LILCBRA

J

jimbob

Member

Mar 23, 2009

21

28

23

Jan 3, 2022

#8

• Jan 3, 2022

• #8

happy new year every body,hopefully better than the last two.hoping someone can answer another question ,my shifter for my for speed trans.is there suppost to be a gasket,where it bolts down on top.cant remember seeing one.if so would some gasket silicone work.could the transmission oil leak out.thanks

 

Reactions: extra_stout

LILCBRA

I wish I didn't have all of these balls in the air

Mod Dude

Dec 6, 2005

6,362

5,341

194

Corn County USA

Jan 3, 2022

#9

• Jan 3, 2022

• #9

I don't remember there being a gasket. Honestly, I don't think there would be much of a problem of leakage there either, but a little RTV sealant wouldn't hurt. I know RTV is used on T5 transmissions.

 

Reactions: extra_stout and 2Blue2

J

jimbob

Member

Mar 23, 2009

21

28

23

Jan 3, 2022

#10

• Jan 3, 2022

• #10

ok,good to know.when i bought the car the parts were scatered.the haines book i bought doesnt tell you everything.thanks

 

Reactions: extra_stout, 2Blue2 and LILCBRA

Enzio

Dang it. I was hoping mine would get 3 more inches

5 Year Member

May 14, 2019

1,054

840

133

Minnesota

Jan 6, 2022

#11

• Jan 6, 2022

• #11

I don't remember there being any gasket.

 

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W

Williamad33

Member

Sep 11, 2025

1

1

13

London

Sep 11, 2025

#12

• Sep 11, 2025

• #12

LILCBRA said:

I'm pretty sure no one makes a kit specifically for the MII, but exhaust bolts shouldn't be too hard to find. You could order a kit and/or a couple different bolt kits
for an older Mustang or something, match what you actually need and use those. OR..... if it were me, I'd buy the correct size threaded rod, make studs and install the manifolds on them. I'd also use some anti-seize on both the stud itself and the nuts I used. Not necessarily an option if you're looking to keep it original or NOS or anything though....
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https://www.cjponyparts.com/amk-products-exhaust-manifold-bolt-set-289-302-1968-1970/p/EXMB5/?year=1968&gclid=Cj0KCQiAkKnyBRDwARIsALtxe7hXOldMyS7sgpZ1s--1q-ZxK9p3TlJw2xRouXa2qDvpqHDMCEZtffwaAn6oEALw_wcB

Click to expand...

I’ve done the same on a small block before and it makes life way easier if you ever need to pull the manifolds again. Plus, with anti-seize you don’t have to worry about snapping bolts down the road.
If originality isn’t a big deal, the AMK kit you linked should work fine — otherwise making your own studs from threaded rod is probably the most reliable long-term solution.

 

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