My b18c is missing the stock inner valvesprings (I can't remember for the life of me if its the intake or exhaust side that is supposed to have them).... but I've got a buddy with 2 sets of 1st gen b16a inners he'll give me... will they fit? Are they comparable to a stock GSR inner valvespring?

 

Intake has duals. the springs your friend has should work fine.

 

Would there be any reason for me to put the other extra set on the exhaust side, even though I'm using stock GSR cams?