Fordmods Logo

Bolt length for Cobra intake? 

 

Page 1 of 1 [ 9 posts ] 

 
 Post subject: Bolt length for Cobra intake?
Posted: Thu Feb 14, 2008 11:10 am 
Getting Side Ways
Offline
User avatar

Posts: 6432

Joined: 5th Nov 2004

Gallery: 6 images

Can someone confirm that the four long bolts for the Cobra intake are 5/16th and 7" long with a metal thread ( UMT or a*** thread type) ?
Or are they only 6" long?

 

_________________

5.6L of carbon footprint.

Top
 Profile  
 
 
Posted: Thu Feb 14, 2008 12:38 pm 
Getting Side Ways
Offline
User avatar

Age: 43

Posts: 732

Joined: 5th Nov 2004

Gallery: 1 images

Ride: LTDHO

Location: South eastern
VIC, Australia

Vic AFAIK they are the exact same as the ones for the HO manifold.
You will only need longer bolts if you put in a backalite spacer.

Thread are 5/16BSW
Top
 Profile  
 
 
Posted: Thu Feb 14, 2008 4:42 pm 
Getting Side Ways
Offline
User avatar

Posts: 6432

Joined: 5th Nov 2004

Gallery: 6 images

3/8 spacer is installed, hence the need for longer bolts. The original long bolts are apparently not long enough.

 

_________________

5.6L of carbon footprint.

Top
 Profile  
 
 
Posted: Thu Feb 14, 2008 6:48 pm 
EFI Guru
Offline

Age: 52

Posts: 4289

Joined: 5th Nov 2004

Gallery: 28 images

Ride: 351 Vogue,XH 5.0,'17 5.0 Stang

Location: Perth
WA, Australia

They should be 5/16" UNC. Just buy some high tensile threaded rod and make your own studs for it.
Top
 Profile  
 
 
Posted: Thu Feb 14, 2008 8:15 pm 
Getting Side Ways
Offline
User avatar

Posts: 6432

Joined: 5th Nov 2004

Gallery: 6 images

XR9UTE wrote:
They should be 5/16" UNC. Just buy some high tensile threaded rod and make your own studs for it.

Sounds like a plan Pete.

But I'm still curious about the original long bolts for the Explorer / Cobra. Wouldn't other people fitting 3/8" phenolic spacers have encountered the same problem with the original bolts being too short and needed longer 7" bolts?

 

_________________

5.6L of carbon footprint.

Top
 Profile  
 
 
Posted: Thu Feb 14, 2008 8:37 pm 
EFI Guru
Offline

Age: 52

Posts: 4289

Joined: 5th Nov 2004

Gallery: 28 images

Ride: 351 Vogue,XH 5.0,'17 5.0 Stang

Location: Perth
WA, Australia

The spacer should come with longer bolts.
I had do the stud trick back in the early '90's with my Cobra intake on the 351. I bought the kit brand new from Ford motorsport and it didn't come with the centre two bolts. When I enquired about the missing bolts I was told that none of them come with those bolts and of course std HO bolts are too short. Pretty f**k up really.
Top
 Profile  
 
 
Posted: Thu Feb 14, 2008 9:48 pm 
Getting Side Ways
Offline
User avatar

Posts: 6432

Joined: 5th Nov 2004

Gallery: 6 images

Well that matches up with my situation, I sourced a Cobra intake a while back and the 3/8" spacer was thrown in - but with no bolts. Now I have found that two longer 7" bolts are required so I am going to do as you suggested and ring a bolt shop tomorrow and get them to custom make me a couple of 7" bolts to fix the problem.

 

_________________

5.6L of carbon footprint.

Top
 Profile  
 
 
Posted: Fri Feb 15, 2008 11:25 am 
Getting Side Ways
Offline
User avatar

Age: 64

Posts: 3552

Joined: 7th Nov 2004

Gallery: 4 images

Power: 482 rwkw

Location: Penrith
NSW, Australia

The Cobra centre bolts are longer than H.O bolts...

 

_________________

As in ZOOM 126 edition
331 Dart block,3.25/ 4340 steel crank, Oliver rods,TFS ported track heat heads, TFS track heat inlet Twin SC61 turbo's
Project 1UZ-EF has started.. S475 Turbo 4.0 V8 Mustang Celica.....

Top
 Profile  
 
 
Posted: Fri Feb 22, 2008 8:44 pm 
Getting Side Ways
Offline
User avatar

Posts: 6432

Joined: 5th Nov 2004

Gallery: 6 images

Dropped a pair of high tensile, 5/16th, UNC, 7" bolts into the upper and it was a perfect fit, thanks guys. They cost $2.50 each from Dandy Bolts down here in Melbourne in case anyone gets into a similar situation and needs to know a place to source them.

 

_________________

5.6L of carbon footprint.

Top
 Profile  
 
Display posts from previous:
Sort by  
 Page 1 of 1  [ 9 posts ] 

Who is online

Users browsing this forum: No registered users and 14 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

 

 

It is currently Tue Dec 12, 2017 1:54 pm All times are UTC + 11 hours

 

 

(c)2014 Total Web Solutions Australia - Australian Web Hosting and Domain Names