Hey im about to send in my head to get machined

so far i have crower valves and springs, ti retainers.

now as for the guides, should i go with alum bronze? or stick with oem cast iron?

i know the alum bronze are cheaper but dont last long.

and oem cast iron make you wanna grab your ankles cuz they cost so much.

heres what i wanna figure out, this is my daily driven car, and it see's lots of track time.

which guide will give me the best performance

because i got ti retainers i will have to replace those sooner, use alum bronze

i dunno what else to ask, ive been working my *** off the last few days, so my mind is outta it.

thanks

 

machine shops can get the aftermarket replacements which arent that expensive and they are up to oem standards

 

they any good?

shouldnt i go with a "performance" guide?

 

i dont think you will even notice a thing performance wise.

 

Just have them put a set of Ferrea bronze guides in.

 

thats what i was thinking of going with

but since its a softer material it wont last as long

how will they do with the extreme heat caused by forced induction?

 

bronze has much better wear characteristics then then the stock iron guides.

 

Im in the same situation. I need some guides and am wondering if the bronze will hold up long term?
Another note, when a new guide is put in, why does the valve need to be ground for a proper seat?