Hi, I have the opportunity to buy a 99' GSR head with a good Port and Polish job with stock GSR internals for 600$. My ultimate goal is to make a LS/VTEC turbo motor for a daily driver. (Say maybe around the 250-300 HP range). I was also thinking of buying a new cast B16 head with a valve job and put all new internals in it but this would cost in upwards of almost 2000$ so i have the opportunity to save about 1400$ here. How would those GSR internals hold up at say around 8.5k? I dont want to buy the GSR head and find out that i need to buy a bunch of new internals so i wont throw a spring at 8k or something like that. Thanks for your input. BTW, the PnP job was a "PORTFLOW PORT & POLISH 6 angle port job" on the GSR head and there is no PnP on the bare head.