STM-Spec Manley Custom 11.5:1 Pistons for 4G63 Evo 4-9

These are the same gas ported pistons we have been testing in our STM Race Engines and easily trapping 165+ MPH in the 1/4! The STM-Spec Pistons are only available in 85.5mm bore and come with coated skirts, rings and wrist pins. If you have questions about your build, feel free to give us a call and we will get you on the right path to your goals. STM-Spec Pistons are capable of handling all the power you can throw at them. Vehicle Fitment: 1996-2006 Evolution 4/5/6/7/8/9 (2.0L 4G63 85.5mm Bore) Part Number: 5812STM1C‑4 Pin: STM-Spec Pin .300" Wall (9310 Alloy) .866" / 22mm Pin Bore Size: 85.5 +.5mm Rod Length: 150 mm Stroke: 88mm Standard Stroke (2.0L) Cylinder Head cc: 43 cc Compression Ratio: 11.5:1 for EVO Weight: 376 Grams Ring Set: 46855‑4 Features: • Gas ported • Moly coated skirts • 2618 high strength material • Lightweight design with offset wrist pin for quiet start-ups • 9310 Alloy 2.250 x .300" STM-Spec wrist pin • Pressure balance groove • Premium Steel top rings with Napier seconds and round wire locks include Includes: (4) Pistons (4) Piston Ring Sets (4) Wrist Pins (4) Spiral Locks