what size-coolant hole in 351W intake?

[moonraker]

I need help - can someone tell me what size thread (what adapter) I need to connect heater hose to the hole in lower intake on 351W engine? I live in Russia and I'm not very good at AN or standard threads....
in the picture it's right below blue fuel rail adapter...

 

[68stang351]

I can't remember what it is, but we sell them at work, I'll check and see what it is. I'm pretty sure it is a pipe thread.

If no one answers by about 6 PM Central US time tomorrow I will post it up.

 

[mustangmutt]

I'ts either a 3/8" npt or 1/2" npt. Older Mustangs used 3/8 npt heater hose fittings but most newer intakes are tapped for 1/2". Almost all heater hose fittings in the after market are 1/2" npt. If it is bigger than the temp sender then it is 1/2" npt.

 

[mustangmutt]

NPT = National Pipe Thread.

 

[moonraker]

Thank you all!
It looks like 1/2" NPT

 

[Max Power]

Aftermarket intakes usually use a larger hole than the factory ones. National Parts Depot makes a factory style fitting to fit the larger aftermarket hole.

 

[68stang351]

Glad someone came through because I forgot to look.