Bronco Hut  
 

   Ford Bronco Parts - Classic Vintage Early Bronco Parts   Toms Bronco Parts   BC Broncos
Community
 Message Forum
 Photo Gallery
 Event Calendar
 Book Reviews
 Bronco Wallpaper
 Bronco FAQ
 
 600+ Bronco Links!
 
Search all Bronco Links
Buy / Sell
 Classifieds / Want Ads
 Vendor Forum
James Duff
Rust Bullet
Sexton Offroad
Bronco Tech
Recent Tech Articles
 •Holley Carb Tips
 •Aussie Locker
 •C6 203 205 Doubler
 •4 Link
 •Clutch Replacement
 •Early Turn Signals
 •C4 Improvements
 •Threaded Dipstick
 •NV3550 5 spd
     More Tech...
Bronco Auctions
Ford Bronco Parts - Classic Vintage Early Bronco Parts

Welcome to the ClassicBroncos.com Forums.

You are currently viewing our boards as a GUEST which limits your access to viewing only. To take advantage of all the forum features please take a moment to register. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact the admin. If you've lost your password click here.

Go Back   ClassicBroncos.com Forums > Archives > Bronco Tech - Archives

 
 
Thread Tools
Old 04/07/06, 08:51 AM   #1
grs44310
Sr. Member
 
grs44310's Avatar
 
We need a little Chlorine in the gene pool!

Akron, Ohio
Joined: Feb 05
eBay: grs44310
Posts: 486

My Gallery
302 Intake manifold bolt torque spec?

I'm attempting to solve an intake leak problem that I believe is keeping my engine from idling like it is supposed to. When I removed the manifold the bolts on the drivers side were barely finger tight. (Hummm, maybe that was my problem)

The Chilton's manual says to torque the bolts in two steps 50-60 ft lbs first in the sequence specified then 80-90 ft lbs in the same sequence. The problem is I have broken two different bolts now trying to get to the first setting of 60 ft lbs. Is this the right torque spec? What grade of hardware should I be looking for to replace my busted bolts?

Thanks,
Greg
grs44310 is offline  
Old 04/07/06, 09:37 AM   #2
airman
Bronco Guru
 
airman's Avatar
 
simple tricks and nonsense

Gilbert, AZ
Joined: Nov 03
Posts: 1,785

My Gallery
I think it depends on the manifold and the bolt. I think those are 3/8 bolts and I doubt they are meant for that much.

I did mine to 28 ft lbs (it called for 25 but it seemed lite so in defiance...) and have no leaks. Just keep re-torquing in the same sequence intil they are set. I must have followed the sequence at least a dozen times to get them tight.

I also bought some good bolts from ARP and have an aluminum intake.

I think maybe the head bolts take the torque #'s that you mentioned above.

75, 351W, Holley TA, C4, Tera Low twin stick, Detroits front and rear, 35x12.5x15 baja claws, 5.5" suspension, wristed arm, rotated front yokes, Currie HD 9", Vac Power Disc/Drum
airman is offline  
Old 04/07/06, 09:44 AM   #3
Cooter_76
Sr. Member
 
Cooter_76's Avatar
 
Austin, TX
Joined: May 04
Posts: 546

My Gallery
I was just looking for this info on the Edelbrock website yesterday. I beleive it said 18-24 ft. lbs.
Cooter_76 is offline  
Old 04/07/06, 09:54 AM   #4
IowaMike
Bronco Guru
 
IowaMike's Avatar
 
My mind is like a steel trap, too bad it's rusted shut.

Council Bluffs, IA
Joined: Sep 01
Posts: 1,260

My Gallery
Just did my 4 bbl intake last week, 18 - 24 as stated. The torques you listed look more like head bolt specs.

So many trucks...so little time.
MSgt USAF (Ret)
IowaMike is offline  
Old 04/07/06, 11:00 AM   #5
Paco
Full Member
 
Paco's Avatar
 
Is that a full-size Bronco?

Pueblo, CO
Joined: Feb 05
Posts: 293
Garage
In Chilton's book, #7140, pg.97, intake manifold specs 19-27 ft.lbs, depending on the year.

In Ford's 1974 truck shop manual, intake manifold bolt torque...20-22 ft-lbs

Beer: The cause of and solution to all of life's problems
Paco is online now  
Old 04/07/06, 11:18 AM   #6
grs44310
Sr. Member
 
grs44310's Avatar
 
We need a little Chlorine in the gene pool!

Akron, Ohio
Joined: Feb 05
eBay: grs44310
Posts: 486

My Gallery
Quote:
Originally Posted by Paco
In Chilton's book, #7140, pg.97, intake manifold specs 19-27 ft.lbs, depending on the year.

In Ford's 1974 truck shop manual, intake manifold bolt torque...20-22 ft-lbs
Ok that makes a heck of a lot more sense for a 5/16-18 bolt. Thank you for the help guys!
grs44310 is offline  
 

  ClassicBroncos.com Forums > Archives > Bronco Tech - Archives

Thread Tools

Forum Jump


All times are GMT -6. The time now is 08:45 PM.


Bulletin Board Software by: vBulletin
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.


This site created, owned and maintained by Jon Hanna
Copyright 1996-2014 All rights reserved. Privacy Statement
ClassicBroncos.com is not affiliated with Ford Motor Company