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



Vehicle Fitment:
1996-2006 Evolution 4/5/6/7/8/9
(2.0L 4G63 85.5mm Bore)

SKU: STM-5812STM1CE-4 Category: Tags: , , ,


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

• 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

(4) Pistons
(4) Piston Ring Sets
(4) Wrist Pins
(4) Spiral Locks


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