R32 Models:
* GXi Type-X - 1.8 L CA18i I4, 91 hp (67 kW)
* GTE Type-X - 2.0 L RB20E I6, 125 hp (93 kW, 172 Nm)
* GTS Type-X, S, J - 2.0 L RB20DE I6 155 hp (115 kW, 184 Nm)
* GTS-25 Type-X, S, XG - 2.5 L RB25DE I6, 180 hp (132 kW, 231 Nm)
* GTS-t Type-M - 2.0 L RB20DET turbo I6, 212 hp (158 kW, 263 Nm)
* GTS-4 - 2.0 L RB20DET turbo I6, 212 hp (158 kW, 263 Nm) 4WD
* GT-R - 2.6 L RB26DETT twin-turbo I6, 280 hp (206 kW, 368 Nm) 4WD also NISMO, V-Spec and V-Spec II variants.
R33 models:
* HR33 GTS - 2.0 L RB20E SOHC I6, 130 PS (96 kW, 172 Nm)
* ER33 GTS25 - 2.5 L RB25DE DOHC I6, 190 PS (140 kW, 231 Nm)
* ENR33 GTS-4 - 2.5 L RB25DE DOHC I6, 190 PS (140 kW, 231 Nm) 4WD
* ECR33 GTS25T - 2.5 L RB25DET DOHC turbo I6, 250 PS (184 kW, 294 Nm)
Source:
http://en.wikipedia.org/wiki/Nissan_skyline
The stock dimensions for the RB engines;
* RB20 - 2.0 L (1998 cc, bore: 78.0 mm, stroke: 69.7 mm)
* RB24 - 2.4 L (2428 cc, bore: 86.0 mm, stroke: 69.7 mm)
* RB25 - 2.5 L (2498 cc, bore: 86.0 mm, stroke: 71.7 mm)
* RB26 - 2.6 L (2568 cc, bore: 86.0 mm, stroke: 73.7 mm)
* RB30 - 3.0 L (2982 cc, bore: 86.0 mm, stroke: 85.0 mm)
* "D" indicates a double overhead cam as opposed to a single overhead cam
* "E" indicates the engine is fuel-injected as opposed to carbureted
* "T" indicates the engine has a factory installed turbocharger
There were a variety of 2.0 L RB20 engines produced:
* RB20E - single-cam (85 to 96 kW (115 to 130 ps) @ 5600 rpm, 167 to 181 N·m (17 to 18,5 kgf·m) @ 4400 rpm)
* RB20ET - single-cam turbocharged (107 kW (145 PS) @ 6000 rpm, 206 N·m (21.0 kgf·m) @ 3200 rpm)
* RB20DE - twin-cam (110 to 114 kW (150 to 155 PS) @ 6400 rpm, 181 to 186 N·m (18.5 to 19 kgf·m) @ 5600 (and later with a NEO-Head 4400 rpm)
* RB20DET - twin-cam turbocharged (158 kW (215 PS) @ 6400 rpm, 265 N·m (27.0 kgf·m) @ 3200 rpm)
* RB20P - single-cam (94 PS @5600 rpm and 142 N·m @2400 rpm)
* RB20DET-R - twin-cam turbocharged (210 ps @6400 rpm and 245 N·m @4800 rpm
The 2.5 L RB25 engine was produced in three forms:
* RB25DE - twin-cam 140 kW/190 PS and 147 kW/200 PS (with VCT) @ 6000 rpm, 255 N·m (26.0 kgf·m) @ 4000 rpm)
* RB25DET - twin-cam turbo (245 to 250 hp and 319 N·m)
* NEO RB25DET - twin-cam turbo (206 kW (280 PS) @ 6400 rpm, 362 N·m (37.0 kgf·m) @ 3200 rpm)
Source:
http://en.wikipedia.org/wiki/Nissan_RB_engine
Just get a non-turbo Nissan Skyline. I'm assuming you're after the R32 so look for the GTS-25 Type-X, S, XG or GTS Type-X, S, J.