where do you get "$700 for oversize valves"? Is that JUST for the valves, or include machine work and valve job needed to put them in?
I have about $600 in the head for mine, including buying the valves (got mine from Oregon Cams, Hughes engines was a little more but not crazy so) and the machine work to put them in, plus (at my request) press in seats on the exhausts, a 70-thousandths shave, also had the tops of the guides shaved/ to make sure I do not get any interference, due to a higher than stock lift cam, they cleaned up/finished up my start to a home porting job, and they even magnafluxed it to be sure I didn't "oops" and grind into a water jacket, with my handiwork. I am contemplating a junkyard homebrew turbo setup for mine "down the road" but a turbo doesn't have to be "either/or". Everything taht will help airflow N/A will help with airflow when turbo'd, that much more. This is my 1st time on any engine doing oversized valves and/or porting a head.
If its bottlenecked when N/A it'll have the same breathing bottlenecks when turbo'd. I'd at least replace the valves (all of them) with new and clean up the nastiness and casting boogers even if staying with stock size valves. as well as back cutting them if the valves have the ridge like OEM ones did.
