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VALVES REMOVE FROM THE N ENGINE First remove the manifold and the tappet covers. Fabricate a tool from a big heavy common screwdriver that can be inserted into the valve ports and used to push the valve guides down enough to remove the horseshoe retainers that hold the valve guides at the bottom of the valve guide just above the spring. When the retainer is removed then it is possible to drive the whole valve assembly out the top of the engine up through the valve port . The spring keepers can then be removed and the valve assembly disassembled. Seals are only used on the intake valve guide and they will be the ones that are the hardest to remove from the block because of the old seal being like hardened glue on the outside of the old intake valve guide. Only use guide seals on the intake when reinstalling the valve assemblies. Since you have a 2N you might want to look at the link below.
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