Spool CP Custom RB30ET (SOHC Head) Pistons 8.5:1

These Spool CP Custom Pistons are available in:

• Bore: +0.5mm
• Comp Ratio: 8.5:1
• 5310 Series Pins

Note: Also available in any bore size and comp ratio – please email for details.

CP Pistons standard features include:

• 5310 gudgeon pins (9310 thicker wall thickness pins are available as an upgrade)
• Deep valve reliefs accommodate high lift camshafts
• Larger valve reliefs for +1mm valve sizes
• Custom skirt cam and barrel design
• Accumulator grooves
• High strength aluminum forgings
• High performance rings
• Fully CNC machined and balanced to +/- 1 gram
• Wrist pins included
• Double pin oilers force fed from oil ring groove
• Pick lock grooves for easy lock removal
• Pin fitting included

Available options

• Piston Pin Upgrades: No Pin Upgrade; 9310 0.200" Pins; 9310 0.250" Pins

Engine build fitment

RB30ET (SOHC). Match the selected dimensions, engine generation and rotating assembly specification before machining or assembly.

Installation and BBT workshop support

Confirm finished bore size, piston-to-wall clearance, compression height, pin specification, ring gaps and valve clearance against the supplied piston documentation.

Built by Boost & Tune is an authorised Spool Imports dealer and can assist with component selection, engine assembly and tuning requirements for your build.