The D series is a SOHC engine. The B, K, and H series have DOHC. As far as I know there is no way in hell to mix a head with one series and put it on another series block. I had a ricer once tell me you can't put a GSR head on a B16, but you can put a ITR head on a B16. Ricers need to change a few more things than the rear lights to Altezzas. HAHA!