The Ford Barn

uncle max · 11-27-2012, 08:02 AM

New Edelbrock heads: A buddy is asking what size the threads are for the temperature senders. Says neither 3/8 NPT or 5/8 UNC feels right...

41ford1 · 11-27-2012, 08:13 AM

3/8" NPT is the sender thread.

Mart · 11-27-2012, 08:41 AM

For what it's worth, for future reference, Not all are 3/8 NPT. Don't know if it's a UK thing, but my 37 style 21 stud heads (Wartime build or Pilot) are 5/8" UNF. But as far as I know, If the thread is not the one, it will be the other.

Mart.

rotorwrench · 11-27-2012, 09:21 AM

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National tapered pipe would be the only standard that would be usable with most types of available OEM and aftermarket senders for a product like an aftermarket aluminum head. The acuracy of cutting a good fit NPT is dependent on not only the correct tap but also correctly tapering the bore prior to the tapping process. If the bore was tapered too large the fit will be loose and too small the fit will be too tight. Hopefully the job was done somewhere in the happy medium range at Edelbrock.

11-27-2012, 08:02 AM	#1
uncle max Senior Member Join Date: May 2010 Location: SLC Utah Posts: 810	Temp sender thread size? New Edelbrock heads: A buddy is asking what size the threads are for the temperature senders. Says neither 3/8 NPT or 5/8 UNC feels right... __________________ RIP Tyler... My Son, Helper & Best Friend. Feb '78 to Father's Day '10. www.97-express.com ~ [email protected]

11-27-2012, 08:13 AM	#2
41ford1 Senior Member Join Date: May 2010 Location: ManchVegas, New Hampshah Posts: 1,591	Re: Temp sender thread size? 3/8" NPT is the sender thread.

11-27-2012, 08:41 AM	#3
Mart Senior Member Join Date: May 2010 Location: Solihull, England. Posts: 9,239	Re: Temp sender thread size? For what it's worth, for future reference, Not all are 3/8 NPT. Don't know if it's a UK thing, but my 37 style 21 stud heads (Wartime build or Pilot) are 5/8" UNF. But as far as I know, If the thread is not the one, it will be the other. Mart.

11-27-2012, 09:21 AM	#4
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 18,006	Re: Temp sender thread size? Sponsored Links (Register now to hide all advertisements) National tapered pipe would be the only standard that would be usable with most types of available OEM and aftermarket senders for a product like an aftermarket aluminum head. The acuracy of cutting a good fit NPT is dependent on not only the correct tap but also correctly tapering the bore prior to the tapping process. If the bore was tapered too large the fit will be loose and too small the fit will be too tight. Hopefully the job was done somewhere in the happy medium range at Edelbrock. Last edited by rotorwrench; 11-27-2012 at 09:31 AM.