ok so it is me thats advising him to go for the RB26 head. reasons being, he can use the standard GTR plenum and throttle bodies, the motor hes gonna get built will be using an aftermarket plenum, so he has to buy the plenum, then use his head, leacing him with a spare inlet and bottom end worth 3/5ths of f*ck all
my theory is to buy the 26 top end, use that, so he'll save 1k on buying aftermarket plenum, then he can sell a complete RB25 motor, easier to get rid of than the parts he would otherwise have. drawbacks would be that he has to buy another ECU/loom (hopeuflly get loom with head) and may have a few ancillaries missing off the bottom end. what ancilaries will need to come off the 25 to build this new motor anyway? alternator, a/c, p/s?
overall i think it would be worth it but i havent built one of these motors before opinions?