Im going to be using crower 1mm oversized intake and exhaust valves on an LS head. Im also using the duel springs and titanium retainers. My question is, is it recommended to get aftermarket valve stem seals and valve guides? Or is stock ok?

 

new stem seals and valve guides.

 

I know I need new ones but should I use factory new ones or aftermarket?

 

if you are buying new ones then I would go with aftermarket.
What rev are you hoping for? If you are trying for higher than stock then go with the high quality guides.

 

Im planning on revving it as high as LS cams make good power. What aftermarket companies make guides. I also need to replace the valve stem seals. Can these remain stock or should these be aftermarket also?

 

Here is a link for the seals.... http://www.compcams.com/catalog/313.html ....I have not been able to find any place for the guides right now.....seen them custom of course......I will keep looking.

 

Thanks