Are valve springs and the cam from a d15b7 head interchangeable with the d15b2 head? We are rebuilding a 90 HB, and we are using a d15b7 block, and we were going to use the d15b2 head, but we noticed that one of the valve springs was from the d15b7 head. Can we change all the springs and the cam from the d15b7 and use it in the d15b2 head without f*cking anything up? Everything but the springs and the cam are the same between the two heads... What is the difference in the cams between the two? If we take the cam and the springs from the d15b7 and use them in the d15b2, will everything work like it should?