ive gotta say i disagree with you mr monster. rob has a damn good rep with his motors and if they are run as he has specified they dont break.
however i do remember him saying the std bottom ends he says to cut the revs at 7200rpm
taken from his site
one thing u need to look at if u put it in ur 33 is the std plenum clearance to bonnet.
options are either:
a) modify engine mounts and drop motor
or
b) get forward facing plenum
i'd go b, as itd help u make more hp
nothing a bit of porting cant fix. plus both r32 and r33 heads have the poo valve springs (being na) but i believe guys have onyl had issues up around 20psi.
i reckon r32 is the better head if ur not gonna use the rb26 head caus of the no vct. plus the 32 ehad is top feed injector already (better selection)
what head is on the rb30? r32 or r33? r33 heads have slightly bigger cams (see pic below)
the r32 rb25de head has smaller ports than an r33 rb25de or any rb26
the r32 rb25de runs top feed high impedence injectors. r33 rb25de head runs side feed high impedence injectors
N/A valve springs dont like big boost. cams & springs are interchangalbe for rb20det items
too late, he's prolly already read this lol
edit - Might help if i add the pic huh
u couldve found a better pic than that
but i must say properly built/tuned rb25's are very strong, heaps of torque off boost too. properly built i mean solid lifters, big valves, big ports, half decent sized cams etc etc lol