Hi all from across the pond

Can any of you tell me the thread size of the inlet manifold bolts?

Joy of joys some of the Torx M40 heads have stripped so I am looking to replace with standard hex headed bolts.

Got to tackle wrestling the remains of the 'stuck' bolts out of the head before a clean up of the manifold and egr can proceed along with an o ring change for the diesel supply lines.

Anyone else have a stuck inlet bolt they managed to remove I'd love to hear your tips for success.

Cheers all and seasons greetings, John