PMC Motorsport Race Stage 2 – Clutch Kit GM Chevrolet V8 LS LS1 LS2 LS3 LS6 LS7 / Vortec – 6-Speed Manual BMW M57N2 ZF GS6-53DZ HGU HGK 325d 330d – Ø184 mm / 7.25" POT – Tilton OT-II Twin disc – max. 900 Nm / 663.8 lb⋅ft

The PMC Motorsport Race Stage 2 kit allows mating the GM Chevrolet V8 LS LS1 LS2 LS3 LS6 LS7 / Vortec engine to the 6-speed manual ZF GS6-53DZ HGU / HGK gearbox found in BMW M57N2 diesel applications (E90 / E91 / E92 325d / 330d). The kit includes an aluminum gearbox adapter plate, a PMC Motorsport Ultralight Race flywheel, and a competition Tilton twin-disc clutch assembly – featuring a Tilton OT-II Cerametallic 7.25" 66-312 HGG pressure plate and two Tilton 64185-8-VV-55 sintered clutch discs – rated to handle up to 900 Nm (663.8 lb⋅ft).

Building a drift, time attack, or road racing vehicle powered by a high-output GM Chevrolet V8 LS / Vortec engine and need a durable 6-speed GS6-53DZ BMW gearbox paired with an ultra-light clutch capable of withstanding immense torque? The Race Stage 2 kit is engineered specifically for professional motorsport applications.

The aluminum gearbox adapter plate (thickness 35 mm / 1.37") is designed to simplify gearbox installation as much as possible, avoiding radical procedures such as cutting off the entire bellhousing – only preparing a clearance pocket for the starter motor is required.

The PMC Motorsport Ultralight Race flywheel is CNC-machined from aluminum and features a replaceable steel friction plate. Each flywheel is inspected and dynamically balanced prior to dispatch. It is designed for high-performance 184 mm (7.25") POT-type clutches, and the kit includes a matched Tilton OT-II Cerametallic 7.25" 66-312 HGG pressure plate and two Tilton 64185-8-VV-55 sintered discs with a 32.5x35-26N spline for the GS6-53DZ gearbox. The compact clutch diameter and ultra-low rotating mass deliver lightning-fast throttle response.

PMC Motorsport parts represent precision engineering and top-tier manufacturing quality. Our design process based on 3D scanning and CMM measuring arm verification guarantees a perfect fit. Modern CNC machining ensures flawless concentric alignment between engine and transmission, which is critical for drivetrain durability.

Additional Information

Installation Instructions

Flywheel installation requires the factory automatic transmission flexplate/ring gear Chevrolet LS, OE 12654640 / 12553054 / 12563136 / 12580709 / 12602448 / 12606620 / 12637677 (not included in the kit). An original Chevrolet LS OE starter motor must be used with this adapter plate. The adapter plate thickness is 35 mm / 1.37".

The flywheel bolts to the crankshaft using the supplied bolts torqued to 80 Nm / 59 lb⋅ft with medium/high strength threadlocker, and the Tilton pressure plate secures with the provided pressure plate bolts. The release bearing and clutch fork remain from your existing gearbox – if the bearing has dual height positions, use the 28.5 mm position. When installing a 184 mm (7.25") clutch, the gearbox input shaft guide tube must be shortened – as illustrated in the technical diagrams below.

Frequently Asked Questions

Which engines are compatible with this kit?

It fits GM Chevrolet V8 Small Block engines from the LS family (LS1 5.7 L, LS2 6.0 L, LS3 6.2 L, LS6 5.7 L, LS7 7.0 L) and Vortec family (4800, 5300, 6000 / VortecMAX, 6200).

Which gearboxes are compatible with this kit?

It is compatible with 6-speed manual ZF GS6-53DZ gearboxes from BMW M57N2 diesel applications (E90 / E91 / E92 325d and 330d) in versions HGU (THGU) and HGK (THGK).

Do I need to cut the gearbox bellhousing?

No. The adapter is specifically designed to eliminate bellhousing cutting – only a starter clearance opening must be prepared.

Which additional parts must be purchased for installation?

You will need the factory Chevrolet LS automatic transmission flexplate/ring gear, OE 12654640 / 12553054 / 12563136 / 12580709 / 12602448 / 12606620 / 12637677, as well as the clutch release bearing, clutch fork, and clutch slave cylinder dedicated to your specific gearbox. These parts are not included in the kit.

Which starter motor should be used?

A factory Chevrolet LS OE starter motor. The starter motor is not included in the kit.

Are gearbox modifications required?

Yes. When using a 184 mm (7.25") clutch, the gearbox input shaft guide tube must be shortened and the release bearing set to the appropriate position (28.5 mm on dual-position bearings). Detailed steps are shown in the technical diagrams in the "Installation Instructions" section.

Which clutch is included in the kit?

A competition 184 mm (7.25") POT-type Tilton twin-disc clutch: a Tilton OT-II Cerametallic Pressure Plate 7.25" 66-312 HGG and two Tilton 64185-8-VV-55 sintered clutch discs with a 32.5x35-26N spline (26 teeth) for the ZF GS6-53DZ gearbox. This clutch assembly features non-self-adjusting operation.

What torque capacity does the Race Stage 2 kit handle?

The maximum rated torque capacity of the kit is 900 Nm (663.8 lb⋅ft).

What is included in the kit?

Aluminum gearbox adapter plate, adapter mounting bolts, custom PMC Motorsport Ultralight Race flywheel with replaceable friction surface, crankshaft bolts, pressure plate mounting bolts, Tilton OT-II Cerametallic 7.25" 66-312 HGG pressure plate, and two Tilton 64185-8-VV-55 sintered clutch discs.

Is this kit suitable for a daily-driven car?

No. The Race Stage 2 kit with a competition Tilton sintered clutch is strictly intended for professional motorsport. For daily-driven street applications, we recommend our kits with Sachs clutches (240 mm single-disc or 215 mm twin-disc setups).

Can I purchase only the adapter plate or individual components?

Yes. Every component of our kits can be purchased separately – including the adapter plate alone or with the Ultralight Race flywheel for 7.25" POT clutches.

Does the price include customs duties for orders outside the EU?

No. Product prices and shipping charges do not include customs duties, import tariffs, or local clearance charges applicable in the destination country.

Can I order with 0% VAT?

Yes, for B2B customers outside Poland with an active EU VAT number (validated in VIES) or for orders exported outside the European Union.

Are the included instructions sufficient for completing the installation?

The manual covers physically mating the engine to the transmission outside the chassis. Depending on the car, custom modifications may be needed: engine mounts, crossmembers, firewall clearance, transmission tunnel adjustments, and driveshaft length. Professional installation is recommended.

Please note that a lightweight rigid flywheel provides uncompromising throttle response by eliminating factory dual-mass damping elements. This yields a direct mechanical connection, which may naturally increase gearbox rollover noise at idle. This is an expected characteristic in performance vehicles equipped with rigid flywheels.