I agreee. Rebuild it.
But what I don't get is why people post things like this on hondaSWAP.
The z6 isn't a powerful motor (its not bad no, but it's not a B series.)
There have been dozens of discussions on why a person should just swap if they are going to do work like internals, valvetrain, turbo..etc.. (fully building.)
It's just going to cost less in the long run, produce more horsepower, and be a less of a headache finding parts with a B series.
For 1/2 of the cost of a z6 turbo kit you could get a B16 (or as much as the cams/camgears.) [not installed mind you], and it's going to produce 30 more HP than the stock z6.
I have a z6 in my stock 5th gen, but if I ever plan on putting money into the car (pending other issues) then it's going to be a swap for sure. A stock GSR is 40 more HP than a z6, and the LS is ~15 more but much more turbo/part friendly.
I figure there are a lot of people that come to these boards for direction (along with myself) but in all honesty, it would cost less and produce more HP with a swap, thats why people do them. Some people are scared to swap (Californians, like myself) have hard emission laws and other things like that... but a lot of the members here are from CA, and if you are not, then a swap would be so easy and not cause you a headache whatsoever.
But hey it's your money. If you want to spend twice as much building up an inferior motor to produce less power... thats your wallet.