I am very happy Using the customer support. I haven't gained my engine yet but to date so good. thankyouThe RB25DE cylinder head within the A31 Cefiro C33 Laurel or R32 Skyline (aka: Non VCT) can be used. The RB25DET (from the R33 Skyline or C34 Laurel or Stagea) head is usually used, even so an ext