Hi all ,

Hope you can help .

Are the Sierra cosworth cam pulleys and aux pulley the same size where they go onto the cams and aux shalf .
What I mean by this is the centre bore size .
I’m trying to fit the aux pulley onto the shalf but seems aux shalf to wide to push pulley on .

Want to know if different size cause if they are I might be trying to fit a cam pulley onto the aux .

Many thanks in advance