The mountune MRX Cylinder head upgrade for the 2.3L EcoBoost (Focus RS / Mustang EcoBoost) features dyno and flow bench tested improvements that produce maximum reliable power across a wide RPM range.

Each cylinder head is based on a new genuine Ford RS casting that is inspected before receiving a precision NEWEN valve seat profile.

The throat of each port is opened up to remove obstructions and then blended into the valve seat to improve flow.

Intake airflow is improved by 44% and exhaust air flow is improved by 28% compared to an otherwise stock 2.3L Cylinder head.

Product Code	2536-MHA-AA
Application	Focus RS 2016-2018 Mustang 2015-2020

Our 2.3L EcoBoost MRX cylinder head also features high-performance black nitrided intake valves, sodium inconel exhaust valves, along with our motorsport valve stem seals, and your choice of V2 or V3 camshafts.

Intake Valve Specifications:

Material	Black Nitrided Stainless Steel
Length	103.3 mm
Stem Diameter	Ø 5.47 mm
Head Diameter	Ø 32.5 mm

Exhaust Valve Specifications:

Material	Sodium / Inconel Filled Alloy
Length	104.70 mm
Stem Diameter	Ø 5.46 mm
Head Diameter	Ø 30 mm

V2 Camshaft Specifications:

Intake Duration	256º (OE Duration 234º)
Exhaust Duration	244º (OE Duration 224º)
Intake Valve Lift	9.60 mm (OE 8.00mm)
Exhaust Valve Lift	8.53 mm (OE 6.99mm)

V3 Camshaft Specifications:

Intake Duration	264º (OE Duration 234º)
Exhaust Duration	256º (OE Duration 224º)
Intake Valve Lift	10.85mm (OE 8.00mm)
Exhaust Valve Lift	9.70mm (OE 6.99mm)

This head is ideal for those running a larger than stock turbocharger.

The mountune MRX Cylinder Head w Camshafts - 2.3L EcoBoost ships completely assembled with valve lash set using all new cam followers and ready to install on your engine.

Important Notice: Extended Lead Times

Due to high demand and ongoing parts supply delays, our custom-built-to-order engines are experiencing extended lead times. We’re committed to quality and appreciate your patience. For the latest lead time estimates, please contact us.

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Focus RS Engine Upgrades

mountune MRX Cylinder Head w Camshafts - 2.3L EcoBoost

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