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Exhaust Manifold Bolts

 
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Danarchy
Turbo EFI


Joined: 25 Mar 2009
Posts: 1060
Location: TEXAS

Post subject: Exhaust Manifold Bolts (Wed Dec 14, 2011 6:48 pm) Reply with quote

Is there a Slant 6 Exhaust Manifold Bolt? Where the manifold attaches to the flange. Or can the muffler shop just put on whatever they have laying around? Reason I ask, tonight I was pulling off the intake & exhaust and the nuts and bolts holding on the flange were not SAE or metric! I took a Sawzall to the exhaust pipe(which was junk anyway) to get it off. I'll dig into it alittle more tomorrow. Just wondering. Confused



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1964 Dart GT
Stock 225 Pushbutton 904
24:1 Steering on 9" Drums all around
14" Rims (185/75R14)
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Slant Cecil
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Joined: 01 Nov 2002
Posts: 1081
Location: Eustis, FL

Post subject: (Wed Dec 14, 2011 7:17 pm) Reply with quote

Do you mean the exhaust headpipe to manifold bolt heads or stud&nut heads are not SAE or Metric?
They should be SAE but they are prone to rusting till they are undersize, that's why your wrench or socket may not seem to fit. Usually a 12mm socket will work on a rusty 1/2" head 5/16 bolt. You may have to use a 6pt instead of a 12pt.



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Slant Cecil

'68 V100, 225-2, 904 - ???
'68 V200, 225-1, 904 - 18.19@74
'68 Signet, 225-2, 904 - 17.42@79
'79 Aspen, 225-2, 904-???
'82 D150, 225, 833OD
'84 D100, 225, 833OD
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DusterIdiot
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Joined: 29 Oct 2002
Posts: 8640
Location: Salem, OR

Post subject: Ugggh... (Wed Dec 14, 2011 7:19 pm) Reply with quote

The exhaust flange is supposed to have 2 studs threaded into it.
But I've had a few that previous owner's drilled out and installed a 7/16" bolt...

The last one I used that was like that I popped for stainless bolts and nuts so they wouldn't seize if I had to take it apart again.

-D.Idiot


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Aggressive Ted
Supercharged


Joined: 15 Jan 2007
Posts: 3783
Location: Black Diamond, WA

Post subject: (Wed Dec 14, 2011 8:14 pm) Reply with quote

I like to drill mine and use stainless because it can be a real pain getting the nuts off if the head pipe is bent crowding the rear bolt....especially on a 2.25' head pipe...there is not much room and you can not use a socket....



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Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live.com/self.aspx/74%20Dodge%20Dart%20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG
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Danarchy
Turbo EFI


Joined: 25 Mar 2009
Posts: 1060
Location: TEXAS

Post subject: (Wed Dec 14, 2011 8:16 pm) Reply with quote

This is not my manifold, just an example to show which bolts. I tried 6 & 12 point sockets. I tried metric and SAE standard of various sizes, they don't look to be rounded off,but they are rusty. I'll just saw them off tomorrow and find a replacement.(Stainless Steel?)
Thanks



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1964 Dart GT
Stock 225 Pushbutton 904
24:1 Steering on 9" Drums all around
14" Rims (185/75R14)
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Aggressive Ted
Supercharged


Joined: 15 Jan 2007
Posts: 3783
Location: Black Diamond, WA

Post subject: (Wed Dec 14, 2011 8:26 pm) Reply with quote

Yes, saw them then off and drill them out. Stainless is great in this application along with the RemFlex gasket part #6006 2.25" head pipe gasket. They are real nice in this application. I used to blow out a FelPro every 6 months or so.....the manifold should have been reground flat. However a horse shoe file got the crusty stuff off and then a good flat file and the RemFlex gasket.



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Aggressive Ted

http://cid-32f1e50ddb40a03c.photos.live.com/self.aspx/74%20Dodge%20Dart%20Swinger


74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG
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KBB_of_TMC
Turbo Slant 6


Joined: 09 Sep 2005
Posts: 853

Post subject: (Thu Dec 15, 2011 2:55 pm) Reply with quote

I never have fasteners rust solid again if I use a little anti-seize grease (usually FelPro) on them. Wish the factory had done that.


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Danarchy
Turbo EFI


Joined: 25 Mar 2009
Posts: 1060
Location: TEXAS

Post subject: (Thu Dec 15, 2011 3:26 pm) Reply with quote

the ones I was trying to remove look like rusted carriage bolts Laughing



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1964 Dart GT
Stock 225 Pushbutton 904
24:1 Steering on 9" Drums all around
14" Rims (185/75R14)
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