Exhaust manifold hole

[1967 satellite]

Here's a strange one. Motor is in the car. 383-4V. I need to remove the exhaust manifolds and send them out for coating. The 3 bolts that should have extended nuts but have hex nuts. How someone did that and why I don't know. I need to turn a 14mm 12 point socket down to fit in the hole, except I can't get a good reading even with calipers. Can anyone measure that hole and let me know. I think it's .640. Many thanks.

 

[khryslerkid]

Pretty sure that takes a sleeve nut. Hopefully it's not broken off and it's just missing. Should be just a stud in there.

 

[1967 satellite]

Pretty sure that takes a sleeve nut. Hopefully it's not broken off and it's just missing. Should be just a stud in there.
View attachment 1802935

No, I was able to get a light with a mirror and look down there and they are definitely hex nuts on the studs. All 3 are the same.

 

[Vaanth]

Yes, as noted, the head should have studs beside the exhaust ports, with nuts on the visible studs, and sleeve nuts on the recessed studs in the holes:

 

[khryslerkid]

No, I was able to get a light with a mirror and look down there and they are definitely hex nuts on the studs. All 3 are the same.

Hard to believe someone found a nut that would fit the stud and also fit in the hole. And have a socket that would work. Nothing surprises me anymore.

Could you just use something short enough for a depth guage? Piece of a zip tie?

 

[1967 satellite]

I have the correct sleeve nuts or extended nuts (3) but I can't get the nuts that are on the studs off. Someone put a 9/16" hex nut on the (3) studs. That's why I need the exact diameter of the hole so I can turn down a socket to get in there. I believe the hole size to be .640"

 

[1967 satellite]

I used calipers to measure the hole diameter but I couldn't get an accurate reading with the motor in the car.

 

[Don Frelier]

I used calipers to measure the hole diameter but I couldn't get an accurate reading with the motor in the car.

I think trial by error may be the exacting method required here.
Hopefully the heads don't need to come off...

 

[BSB67]

Can’t you measure one on the driver side?

In the end does it matter? Grind until it fits. You might need to Jack up the motor .

 

[1967 satellite]

No. I did that, to tough to get to. I did grind a socket but it's such a tight fit that the socket broke when trying to loosen it. There is very little room for error in getting the od correct on the socket that's why I want to machine turn it. I don't have a lathe so I need to take it somewhere and I want to get it right the first time.

 

[Vaanth]

This one measured ~0.6445" on both holes. There will be some variation depending on wear, rust, when made, tooling differences, etc.

 

[1967 satellite]

Many thanks. That's what I thought but I wanted to be sure.

 

[R413]

I think trial by error may be the exacting method required here.
Hopefully the heads don't need to come off...

The exhaust manifold is blocking the head bolts. Need to remove manifold first to remove head.

 

[Don Frelier]

The exhaust manifold is blocking the head bolts. Need to remove manifold first to remove head.

Good point

 

[Dutchrebuild]

Sounds like a good old fashioned **** show!

 

[dadsbee]

Light tube style driver like you find in a sled or atv tool kit.

 

[old guys rule]

Here's a strange one. Motor is in the car. 383-4V. I need to remove the exhaust manifolds and send them out for coating. The 3 bolts that should have extended nuts but have hex nuts. How someone did that and why I don't know. I need to turn a 14mm 12 point socket down to fit in the hole, except I can't get a good reading even with calipers. Can anyone measure that hole and let me know. I think it's .640. Many thanks.

View attachment 1802927

View attachment 1802928

I believe I have a set.Will check in AM. You can have them for shipping Dave

 

[R413]

I believe I have a set.Will check in AM. You can have them for shipping Dave

Old guys do rule, that's what it's all about right there.

 

[old guys rule]

Old guys do rule, that's what it's all about right there.

Found them. PM me your address.

 

[RemCharger]

I think there was a thread like this a yr ago.. that's a true issue.
Here it is
Thread 'Exhaust Manifold removal' Exhaust Manifold removal