I'm more than happy Together with the customer support. I haven't acquired my engine nevertheless but up to now so great. thankyouThe RB25DE cylinder head in the A31 Cefiro C33 Laurel or R32 Skyline (aka: Non VCT) may be used. The RB25DET (within the R33 Skyline or C34 Laurel or Stagea) head is also used, however an exterior oil feed need to be fab