information on elusive late 2003 roller rocker head

[ryanquad]

there seems to be hints of information that the 1nz had a limited run of a differently designed cylinder heads in late 2003. This head had hydraulic lash adjusters and roller rockers as well as 21* valves as opposed to the 33* in standard 1nz. should be good for some serious HP gains especially for those wanting to stay NA

I would greatly appreciate any information anyone has on this subject

here is one websites that I found information of this existing on
https://toyota-club.net/files/faq/05...faq_nz_eng.htm