Hi,

I was wondering if some one could tell me a little bit about changing valve guides on a pr3 head, do I have to change them if I'm going to upgrade my valves or is the OEM good enough?

Thanks in advance for answers

 

OEMs are good for street cars and most drag cars. Only time to change them is if there cracked or you want to run a specific type of valve.

 

What about the KMS valves, do I have to change valve guides if I'm going to use these?