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 exterior oil feed should be fabricated for your varia