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The guide has a circlip to limit depth into head. You will need to do ALL the guides and then have the seats cut to be concentric.
Any good automotive machine shop can install a set of guides and dress the seats.
As much a 4 tons need to be applied to the guide to set it in the head.
Each guide will angle very slightly different to the origonal..that's why the seats need dressed.
Make sure the shop knows the clearence...valve stem to guide.
Guides are responsible for blow-by into the crank case as well as proper valve alignment and oil control.
Buy a genuine set of OEM seals..intake and exhaust are different.
My last set # A117 050 01 67.
Black : Exhaust.
Brown : Intake.
P.S...Always use the OEM exhaust valve..new or used...They have a very hard industrial chromed stem and last for years.
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