Inlet vacuum take off thread size

[bloodknock]

Can anyone please advise me of the exact thread size and type for the vacuum take off on the No1 inlet tract!
Many thanks

[RichardHawkins]

Bloodknock,

My engine is out of the car, making access easy. I have removed and measured the fitting, it is 1/8” NPT. please be aware that just because my engine has an NPT fitting does not necessarily mean it’s is correct.

Hope this helps,

Richard Hawkins

[mbell]

I think the head fittings are bsp, so it's 1/8 bsp. But 1/8 bsp is very close to 1/8 npt.

[englishmaninwales]

The engine block threads are NPT (Ford component) but Lotus cylinder head threads are BSP - in this example 1/8 BSP.
Malcolm

[bloodknock]

Thank you gentlemen