The Ford Barn

Preacher · 05-26-2012, 10:42 PM

can't locate a printed thread size for a Holley NH drain valve assembly (center drain). i need to repair the female thread in the mixing chamber. anyone have this info or know where to look? the OD on the drain valve measures .553" approx 24 tpi. could this be a 14mm thread?

Doug Money · 05-26-2012, 11:13 PM

Spray nozzle is easy. It is 3/8 24 UNF. The drain valve is a little more difficult. It is 9/16 24 UNEF. If you need to retap the needle valve threads, they are 1/4 32 UNEF.

[email protected] · 05-26-2012, 11:34 PM

Good call Doug. The first thing I thought of at .553 was 9/16-24. I almost feel smart now.

Preacher · 05-27-2012, 09:17 AM

Thank you very much, where / how did you find this info?

Doug Money · 05-27-2012, 12:31 PM

mtfca website. All of the info is there.

To search type this in your browsers search box with no quotes, "nh threadsize site:mtfca.com"

The nh threadsize can be substituted for whatever you are looking for and the website after site: can be substituted for where you want to look.

Preacher · 05-27-2012, 02:54 PM

Sponsored Links (Register now to hide all advertisements)

Thanks loads! Turned a Stainless S threaded bushing, then bored the carb, epoxied in place. IMG_20120527_143818.jpg

IMG_20120527_134004.jpg

05-26-2012, 10:42 PM	#1
Preacher Senior Member Join Date: May 2010 Location: Minnesota Posts: 198	Holley NH Thread size can't locate a printed thread size for a Holley NH drain valve assembly (center drain). i need to repair the female thread in the mixing chamber. anyone have this info or know where to look? the OD on the drain valve measures .553" approx 24 tpi. could this be a 14mm thread? __________________ If it ain't broke, fix it 'til it is ... http://tcmafc.org/

05-26-2012, 11:13 PM	#2
Doug Money Senior Member Join Date: Jul 2010 Posts: 350	Re: Holley NH Thread size Spray nozzle is easy. It is 3/8 24 UNF. The drain valve is a little more difficult. It is 9/16 24 UNEF. If you need to retap the needle valve threads, they are 1/4 32 UNEF.

05-26-2012, 11:34 PM	#3
[email protected] Senior Member Join Date: Aug 2010 Posts: 937	Re: Holley NH Thread size Good call Doug. The first thing I thought of at .553 was 9/16-24. I almost feel smart now. __________________ It's 110 miles to Chicago We've got half a pack of cigarettes It's dark And we're wearing sunglasses Let's go.

05-27-2012, 09:17 AM	#4
Preacher Senior Member Join Date: May 2010 Location: Minnesota Posts: 198	Re: Holley NH Thread size Thank you very much, where / how did you find this info? __________________ If it ain't broke, fix it 'til it is ... http://tcmafc.org/

05-27-2012, 12:31 PM	#5
Doug Money Senior Member Join Date: Jul 2010 Posts: 350	Re: Holley NH Thread size mtfca website. All of the info is there. To search type this in your browsers search box with no quotes, "nh threadsize site:mtfca.com" The nh threadsize can be substituted for whatever you are looking for and the website after site: can be substituted for where you want to look.

05-27-2012, 02:54 PM	#6
Preacher Senior Member Join Date: May 2010 Location: Minnesota Posts: 198	Re: Holley NH Thread size Sponsored Links (Register now to hide all advertisements) Thanks loads! Turned a Stainless S threaded bushing, then bored the carb, epoxied in place. IMG_20120527_143818.jpg IMG_20120527_134004.jpg __________________ If it ain't broke, fix it 'til it is ... http://tcmafc.org/