You will need to grind one corner of the HF manifold. It hits a "web" on the ZC block. Its no big deal but it needs to be done so the manifold will sit flat:TU:does anyone know if i will have to get a adapter plate to bolt on a hf manifold to my d16a. Cause i want to bolt up my 14b. Any help is appreciated. If not let me know another good route.