Warning: parse_url(http://:str-427-cobra.blogspot.com) [function.parse-url]: Unable to parse URL in /includes/init.php(329) : eval()'d code on line 35
RPM Manifold threaded hole size. - Cobra Club Forums
Cobra Club Forums
Cobra Club Forums

Welcome to the Cobra Club Forums forums.

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. 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 us.

Go Back   Cobra Club Forums > Tech Tips > Engine Tech Tips & Questions
RPM Manifold threaded hole size. RPM Manifold threaded hole size.
Home Forums Blogs Videos Gallery Cobra Marques Info Groups Classifieds Gallery Arcade Shopping
Register FAQ Members List Calendar Search Today's Posts Mark Forums Read

Reply
Page 1 of 2 1 2 >
 
LinkBack Thread Tools Display Modes
  #1 (permalink)  
Old 09-11-07, 05:51 PM
Andy302's Avatar
Club Supporter
My Cobra Gallery
  
Join Date: Apr 2004
Location: Swindon, Wiltshire, England.
Posts: 1,467
Question RPM Manifold threaded hole size.
Gents,

Ive done the usual hunt of the forum. I can find references to the use of the two big holes into the water jacket at the front of a Edelbrock RPM manifold on a Ford 302 (heater take off and temp sender take off) but I cant find what thread size and type they are.

Can anyone help out? Ive tried ringing Edelbrock but gave up (I now know there hold ads very well!)

Many Thanks!
__________________
Andy

Ford 302 336 BHP 331 ft/lb's , GD JAG249 rolling!!
Predicted finish... not bl$$dy likely this side of 2020.

www.andysgd427.blogspot.com
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
Sponsored Links
Advertisement
  #2 (permalink)  
Old 09-11-07, 05:59 PM
Spanish Dave's Avatar
Senior Member
My Cobra Gallery
  
Join Date: Aug 2005
Location: Oliva ... Sunny Spain
Posts: 162
they should be 1/2 inch NPT.
__________________
AK with 350 SBC .. Performer RPM package .. Mighty Demon 750 d/p .. Tremec TKO500 .. blue with white stripes just to be different !! Here in Sunny Spain with no hood or tonneau cover !!
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
  #3 (permalink)  
Old 09-11-07, 06:08 PM
Miket's Avatar
Fully Paid Up Grandad
My Cobra Gallery
  
Join Date: Jul 2001
Location: Newton Abbot, Devon, UK. (God's waiting room)
Age: 60
Posts: 10,275
I think they are 3/8 NPT
__________________
AK 427 FOR SALE


PistonHeads AK for sale

Mike
AK Sportscars
355 Hauser Chevy

The old believe everything, the middle-aged suspect everything, the young know everything.

Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
  #4 (permalink)  
Old 09-11-07, 06:10 PM
kayjayd's Avatar
Club Supporter
My Cobra Gallery
  
Join Date: Jul 2003
Location: Thirsk, North Yorkshire
Age: 37
Posts: 1,935
Temp sender hole is defo 3/8 NPT.
__________________
Kev
AK - 383 chevy
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
  #5 (permalink)  
Old 09-11-07, 06:10 PM
Andy302's Avatar
Club Supporter
My Cobra Gallery
  
Join Date: Apr 2004
Location: Swindon, Wiltshire, England.
Posts: 1,467
Cheers for quick response!

Two options appearing... Would the 3/8 or 1/2 be measureable as the diameter of the hole?
__________________
Andy

Ford 302 336 BHP 331 ft/lb's , GD JAG249 rolling!!
Predicted finish... not bl$$dy likely this side of 2020.

www.andysgd427.blogspot.com
Last edited by Andy302; 09-11-07 at 06:14 PM.
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
  #6 (permalink)  
Old 09-11-07, 07:27 PM
Senior Member
My Cobra Gallery
  
Join Date: Jun 2007
Location: hankelow crewe cheshire
Posts: 191
Quote:
Originally Posted by Andy302 View Post
Cheers for quick response!

Two options appearing... Would the 3/8 or 1/2 be measureable as the diameter of the hole?
If you can get your finger in the hole its 1/2 if not its 3/8
Mike
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
Sponsored Links
Advertisement
  #7 (permalink)  
Old 09-11-07, 07:29 PM
Andy302's Avatar
Club Supporter
My Cobra Gallery
  
Join Date: Apr 2004
Location: Swindon, Wiltshire, England.
Posts: 1,467
Quote:
Originally Posted by mike huddart View Post
If you can get your finger in the hole its 1/2 if not its 3/8
Mike
Which finger?
__________________
Andy

Ford 302 336 BHP 331 ft/lb's , GD JAG249 rolling!!
Predicted finish... not bl$$dy likely this side of 2020.

www.andysgd427.blogspot.com
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
  #8 (permalink)  
Old 09-11-07, 07:50 PM
wilf's Avatar
Club Supporter
My Cobra Gallery
  
Join Date: Jan 2001
Location: On the naughty step
Posts: 8,142
Quote:
Originally Posted by Andy302 View Post
Cheers for quick response!

Two options appearing... Would the 3/8 or 1/2 be measureable as the diameter of the hole?
From memory, NPT threads are classified according to the internal diameter of the pipe they served, so a 3/8" NPT thread has a larger diameter than 3/8", possibly more than 1/2".

So whilst there is a relationship between the thread descriptor and the hole diameter, it is not direct.

See here for info: http://www.engineeringtoolbox.com/np...ads-d_750.html
__________________
My opinion is worth exactly what you paid for it.

CRENDON - go on, you know you want to!
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
  #9 (permalink)  
Old 09-11-07, 08:13 PM
rich's Avatar
Club Supporter
My Cobra Gallery
  
Join Date: Apr 2004
Location: Chesterfield, Derbyshire
Age: 40
Posts: 2,143
'Serving pipes' and not being able to put your finger in holes all sounds a bit gay to me
__________________
You know it makes sense
rich.




All Things Cobra.Com

the cobra builders resource
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
  #10 (permalink)  
Old 09-11-07, 08:36 PM
Simon R's Avatar
Club Supporter
My Cobra Gallery
  
Join Date: Jan 2007
Location: Newcastle upon Tyne (ish)
Age: 43
Posts: 220
Quote:
Originally Posted by wilf View Post
From memory, NPT threads are classified according to the internal diameter of the pipe they served, so a 3/8" NPT thread has a larger diameter than 3/8", possibly more than 1/2".

So whilst there is a relationship between the thread descriptor and the hole diameter, it is not direct.

See here for info: http://www.engineeringtoolbox.com/np...ads-d_750.html
One of the last pages of the aeroquip catalogue has silhouettes of the various male fittings - NPT and Others - I think it was to scale.

..... On reflection this is only usefull if you had said catalogue
__________________
GDJAG
Chassis Complete
BAE 383 SBC in and running
MKIV Body fitted - trim and shiny bits to do.
Aiming for SVA not IVA
Building a GD 427
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
Sponsored Links
Advertisement
Reply
Page 1 of 2 1 2 >

« Previous Thread | Next Thread »
Thread Tools
Display Modes
Linear Mode Linear Mode

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Unidentified threaded hole in engine block! bopit123 Engine Tech Tips & Questions 4 26-02-07 09:57 PM
Edelbrock performer threaded holes JohnWoodman General Cobra Discussion 6 06-07-06 09:49 PM
hole size tonym General Tech Tips & Questions 6 15-02-04 01:46 PM
Thread type and size on SBC manifold and heads SimonP General Tech Tips & Questions 2 03-07-03 12:38 AM
Cylinder /manifold thread size beanpole Engine Tech Tips & Questions 4 21-04-03 02:38 PM


All times are GMT. The time now is 11:39 PM.

Contact Us - Cobra Club Forums - Archive - Top

Powered by vBulletin® Version 3.7.0 Beta 4
Copyright ©2000 - 2008, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO 3.2.0