Another thing fyi make sure the retainers and springs match...I had skunk2 springs and supertech alum. retainers in my pr3 head and the retainers broke! So I had to order the skunk2 titanium retainers...which i should have gotten in the first place but i wont get into that now...and the b16 is a perfect turbo motor...i can remember which month but Honda Tuning had one that was almost stock that made 400hp turbo'ed!!!! The issue had a FIt on the cover... ANyways that'll do!!