I used to think those best motoring comparisons were the shit steveo !
But then I found out that some of the cars are modified different tyres etc etc etc.
As for the head I am fairly sure the port sizes on the J engines are smaller then that of the RB 25/26.
Further, ask anyone what you can make on a standard RB26 head (ALOT) and then remember that it is 400CC smaller then a 2J and then you start to realise how good a job Nissan did, not to take anything away from toyota Though.
If it was a issue of being old I dont see why people would use a 2J bottom end on their 1J engines. as anyone that is changing bottom end isnt going to use a standard part anyway
Plus it would be cheaper just to build a 2J rather then stuff around with the time and money building a hybrid, especially since you already have the three litres, unlike our sort of people here who start with the 2.5/2.6 L
I had it put to me that the 1J head rev's harder and has better geometry then the 2J hence, why the couple it with the increased displacement.
Not to take anything away from the 2J but I think alot of the hype about their indestructibility came from too many people jerking themselves off over HPI and ZOOM magazines articles particularly people who write them that seem to find a new flavour of the month and mercilessly hammer it in the magazine for some unknown reason.....,
You need to look at brand new engines and how they perform not dirty old slappers like alot of us have here.
For instance, I saw a 4g63 make 690 wheel horsepower the other day on a completely stock bottom end, only 2.0 Litres, must be the best engine of all time right ?