caged240
+1y
well the rb like everyone says is a straight 6 from the skyline and the sr20 is a 4cyl form the silvia. they will run you about the same pricing and make about the same power stock. the difference is the rb(straight 6) will make more torque then the sr(4 cyl). parts r expensive for the rb compared to the sr and will make almost the same amoont of power when modified and the rb weighs more then the sr. i do have both motors the sr was in my orignal 240 and the rb i my new. if you wana do a nissan swap in your b-series i would suggest the sr. parts a easy to come by and really not all that expensive. but if your feeing like making big power and wana do something unique there is always the 1j or 2j swap from the supra the 2j can make 400hp on the stock motor with the boost and fuel turned up plus they r pretty much bullet proof.