Cylinder head core plug

[andy-w]

Hi guys,

Does anyone know the size of the core plug on the front face of the cylinder head just behind the swirl pot.

It looks to be about 20 - 25mm?

And does anyone know where i can get one...been on Rimmer Bros website and they ahve loads of various sizes...just not sure which one to get.

And before anyone says measure it i am about 5 mile away from the car....!!!!