New Page 1The technology is finally here! PHR is proud to offer the very first CNC ported cylinder head package for the RB26. This is the ultimate in cylinder head technology for the serious enthusiast and/or professional racer. We start with *brand new* Nissan cylinder heads, then let the 5 axis CNC machine perform its magic. The end result is hand blended and flow tested to over 300 cfm intake/200 cfm exhaust per valve at .450" lift. The benefit of CNC machining is that each cylinder is ported to the exact same profile, to prevent cylinder imbalances common to hand-ported cylinder heads. There is no core charge since we begin with brand new Nissan cylinder heads, this means you get the highest quality for your investment. This is for all-out race use only. Includes the full valvetrain upgrade, including 1mm oversize Valves, Dual Valve Springs, Titanium Retainers, Bronze Valve Guides, PHR Spec CNC Shimless Buckets and full 5 angle valve job.
These special CNC Ported Heads utilizing 1mm over Valves require Custom PHR Spec Boost Pistons and Special Coated Rings to allow proper clearance from the Oversized Valve. These Pistons allow better Flame flow in the cylinder and making up the compression loss from the CNC Head back to 8.5:1.
Also with the kit you have to purchase either 280 or 290 Lift Camshafts for the proper build and to allow us to check all clearances.
Contact us for pricing and specifics, also available bare without valvetrain installed, but including CNC porting, hand blending, and bronze valve guides.
Click Here for a larger picture of the CNC Porting
Click Here for a larger picture of the Head Package
Click Here for a larger picture of the Cam side of the Head
Click Here for a larger picture of the front of the head
Click Here for a larger picture of the supertech valve
Note: This price includes, CNC work, Cams, Shimless buckets and custom spec Pistons. New OEM Head is purchased separately and takes approx. 3-4 weeks from Japan at $1200 per head.