valve guides? what do I NEED to do?

[shiboujin]

I have a spare motor and want to build it to be hearty. I thought about new valve guides but don't you have to get new valves too? that easily becoems >$200 in just parts... What else should I do or is there a cheaper solution for guides?

[AlarmedBread]

guides need to be professionally installed.

[shiboujin]

I know. I'm having a shop do them. I wanted to know if I need to have them do valves and guides or can I get away with just guides.

[FredK]

Now, take this with a grain of salt, as I am not a machinist, but I don't think you will need new valves.

Usually a machine shop "reconditions" the valves, meaning they are cleaned thoroughly, and ground in certain areas. Prior to reconditioning, they will measure the stems to see if the stem to guide clearance will be within spec.

[shiboujin]

Yea I think that what I'm going to do. replace as necessary. If all but 1 guide is good, why replace them all?

[jakeb]

You need to really have the valves checked before saying you need them or not.

When I had an m10 head redone the head guy(all he does) said normally the exhaust valves need to be replaced because the heat of the exhaust burn the oil off the bottom part of the valve stem. Thus giving them more wear. I had to only replace the exhaust valves.