Holley NH Thread size

[Preacher]

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]

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.

 

[garrisonm89@yahoo.com]

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

 

[Preacher]

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

 

[Doug Money]

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]

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