The Ford Barn

cb ndrhsr · 01-30-2012, 09:20 PM

Greetings folks, I have 2 questions to ask. 1st: why are the exhaust manifold bolts different sizes on my 8ba? The front ports are 7/16", the middle & rear are 3/8". Got to be a reason for this. 2nd: how will a 3" extension affect torque readings on my torque wrench, some bolts just need and extension to get to. Thanks. CBN

Bob G/Spanaway · 01-30-2012, 10:28 PM

Dunno why the bolts are different.
Extension won't change anything.

georgewarren · 01-30-2012, 10:33 PM

I think the center bolts act as locators, while the outer bolts allow for heat expansion of the manifolds.

ken ct · 01-31-2012, 03:45 AM

All flatheads are like that.They came from the factory like that. ken ct.

BrianCT · 01-31-2012, 09:09 AM

Probably goes back to the original 21 stud design where the head pipes also mount on the front studs.

Walt Dupont--Me. · 01-31-2012, 09:22 AM

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Quote:

Originally Posted by BrianCT

Probably goes back to the original 21 stud design where the head pipes also mount on the front studs.

Brian CO has it right. Walt

cb ndrhsr · 01-31-2012, 07:13 PM

Thanks for the answers, I knew they were like that, I just didn't know why.

01-30-2012, 09:20 PM	#1
cb ndrhsr Junior Member Join Date: Oct 2011 Location: Layton, Utah Posts: 24	Acoupla questions Greetings folks, I have 2 questions to ask. 1st: why are the exhaust manifold bolts different sizes on my 8ba? The front ports are 7/16", the middle & rear are 3/8". Got to be a reason for this. 2nd: how will a 3" extension affect torque readings on my torque wrench, some bolts just need and extension to get to. Thanks. CBN

01-30-2012, 10:28 PM	#2
Bob G/Spanaway Senior Member Join Date: Sep 2011 Location: Spanaway, Washington Posts: 344	Re: Acoupla questions Dunno why the bolts are different. Extension won't change anything.

01-30-2012, 10:33 PM	#3
georgewarren Senior Member Join Date: May 2010 Location: Suffolk, VA & Key West, FL Posts: 119	Re: Acoupla questions I think the center bolts act as locators, while the outer bolts allow for heat expansion of the manifolds.

01-31-2012, 03:45 AM	#4
ken ct BANNED Join Date: May 2010 Location: stratford,ct Posts: 5,971	Re: Acoupla questions All flatheads are like that.They came from the factory like that. ken ct.

01-31-2012, 09:09 AM	#5
BrianCT Senior Member Join Date: May 2010 Location: Windham, CT Posts: 702	Re: Acoupla questions Probably goes back to the original 21 stud design where the head pipes also mount on the front studs. __________________ [FONT=Comic Sans MS]

01-31-2012, 07:13 PM	#7
cb ndrhsr Junior Member Join Date: Oct 2011 Location: Layton, Utah Posts: 24	Re: Acoupla questions Thanks for the answers, I knew they were like that, I just didn't know why.