Length of 182 to 172 manifold pipe adapter? helppps

[Tobs]

need to make up my pipe for my 182 to 172 manfoild pipe adapter, done the conversion just need the pipe lenght now, anyone know of it or got theres they could measure for me, will lick your hairy asses for you:rasp:

 

[sideways danny]

tape measure? measure the gap between the flanges......