SERIOUS RACING ENGINE UPGRADE

264°/272° | 10.8mm/10.8mm Valve Lift

Note: This kit is shimless and requires a qualified trades person to machine and setup the head for best results.

– Intake requires a 45.10mm-45.40mm Tip height
– Exhaust requires 49.00mm-49.30mm Tip height

These tip heights will get valve clearances close, machine the tip of the valves to set the correct clearances. Best results are done using a torque plate.

244HV-B

Designed for high-boost, high-RPM racing, this kit features Kelford’s shimless bucket package and ultra-clean Silicon Chrome spring steel for excellent fatigue resistance. The high-frequency springs minimize surge at elevated RPMs, while the titanium retainers eliminate the need for shims. Ideal for maximizing RB engine performance.

• 110lb seat pressure at 36.0mm installed height.
• 230lbs at 11.0mm valve lift. Coil bind at 22.0mm. 13.0mm max lift.
• Includes spring seats to set the correct spring installed height.

Cam Follower 34mm x 6.5mm.

• Full set x 24

VAL-244-IN-12

FERREA +1.00MM NISSAN RB25 NEO “CUSTOM” INTAKE SET (Shimless) 35.15mm, 5.98mm, 103.90mm, 6.20mm. Cut seat to achieve 45.10mm-45.40mm tip height.

VAL-244-EX-12

FERREA +1.00MM NISSAN RB25 NEO “CUSTOM” EXHAUST SET (Shimless) 30.65mm, 5.96mm, 104.35mm, 10.1mm. Cut seat to achieve 49.00mm-49.30mm tip height.

Nissan 6° Radius Bead lock

Manganese Bronze Valve Guides  10.03mm O/D 5.95mm I/D with Stopper

Stem 6mm. Guide OD 10mm. Seal OD 12.6mm. Polyacrylic.