I have seen some BIG HP SR & RB engines. But if I was going for the a 4-cylinder Z it would still be the FJ20DET that got my vote. The SR was a less efficient valve train, worse head/chamber design & has been known to spin main bearings when pushed REAL hard.
The FJ is a F1 derived engine & the iron block is waay stronger than the alloy SR.
At the end of the day the RB20/25 is the way to go. Parts are abundant in Japan & Australia for these motors & if I have to get my 'L series' parts from the US, then you guys can buy your RB parts from AUS
But as we all know, money makes the final decision...
