Developed by Unrivaled Engineering, this low-mount billet serpentine kit provides a compact and reliable alternator mounting solution for Holden 304 and 308 engines. Positioning the alternator low on the driver's side of the engine, this system is particularly popular in Holden Torana applications and other vehicles where engine bay space is limited or a low mount accessory drive arrangement is preferred.

CNC machined from high-grade 6061 billet aluminium and supplied with stainless steel hardware, the alternator bracket has been engineered to position the alternator as close to the engine as possible. By minimising bracket offset and overall package size, potential interference with chassis rails, suspension components, and surrounding engine bay structures can be significantly reduced.

The kit is designed to suit Chevrolet-style alternators with 168mm mounting centres, providing access to a wide range of readily available charging options, including high-output units for EFI systems, electric fans, fuel pumps, and other modern electrical demands.

Installation Note: Due to variations in water pump pilot diameters between manufacturers, please check the fit of the pulley centre pilot before installation. A small amount of hand filing may be required to achieve the correct fit.

Features

• CNC machined from high-grade 6061 billet aluminium

• Compact low mount driver's side configuration

• Designed to position the alternator extremely close to the engine

• Supplied with stainless steel mounting hardware

• Compatible with Chevrolet-style alternators (168mm mounting centres)

• Suitable for standard and high-output alternator applications

Why We Use an Eccentric Idler Pulley

Engineered to work with our Unrivaled Engineering Eccentric Idler Pulley system, this design delivers more than just belt adjustment. The eccentric idler introduces a controlled interruption point in the belt path, helping to dampen belt harmonics and reduce belt slap during engine operation. These belt oscillations occur in all belt-driven systems and are commonly encountered at specific RPM ranges, often contributing to premature belt wear, belt loss, and accessory drive instability. By

controlling belt movement and maintaining consistent tension, the eccentric idler improves belt life, reliability, and overall accessory drive performance.

Benefits

• Maximises engine bay clearance

• Ideal for Holden Torana, early chassis Holdens, and other tight engine bay engine swap applications

• Reduced risk of alternator-to-chassis interference

• Strong and rigid billet construction

• Access to a wide range of readily available alternator options

• Clean, purposeful engine bay appearance

Fitment

• Holden 304 V8

• Holden 308 V8

• Driver's side low mount configuration

• Chevrolet-style alternators with 168mm mounting hole centres

Specifications

• Material: 6061 Billet Aluminium

• Hardware: Stainless Steel

• Alternator Type: Chevrolet Pattern

• Alternator Mount Centres: 168mm

• Mounting Position: Driver's Side Low Mount

Variant Options

Finish:

• Raw Billet Aluminium

• Satin Black Anodised

Water Pump Configuration:

• Long Water Pump

• Short Water Pump

What's Included

• Billet alternator bracket assembly

• Unrivaled Engineering eccentric idler pulley

• Matching 6PK serpentine pulleys

• Correct-length 6PK serpentine drive belt

• Stainless steel mounting hardware

Important Notes

• This bracket is designed as a low mount alternator system and positions the alternator extremely close to the engine for maximum clearance.

• Due to variations between vehicle makes, models, chassis modifications, engine mounts, headers, steering components, and suspension configurations, the end user must confirm suitability for their application prior to purchase.

• This bracket does not allow the use of a mechanical fuel pump.

• Electric fuel pump conversion is required when using this bracket.

Ordering Notes

• Please select both your finish option and water pump configuration when ordering.

All Unrivaled billet parts are considered aftermarket and suitable for racing/off road purpose, these are not OEM replacements fitment & vehicle safety is responsibility of vehicle owner. Unrivaled ensure that these parts are to the highest standards and fit the specified engines correctly. Vehicle fitment is responsibility of vehicle owner and pre purchase checking is advised before purchase of any billet aftermarket parts. There is no return on billet parts for change of mind or vehicle fitment issues.