You fellas actually saved me a lot of issues having a disgruntled consumer on this one particular. Ralph, I owe you guys a beer when next I arrive about to your warehouse. Arigato!The RB25DE cylinder head in the A31 Cefiro C33 Laurel or R32 Skyline (aka: Non VCT) may be used. The RB25DET (from your R33 Skyline or C34 Laurel or Stagea) head is addit