The A.P.E. Silverback 128ci is the flagship naturally aspirated Alpha Performance Engines package for Harley-Davidson Milwaukee-Eight riders chasing maximum horsepower and top-end performance. This is not the mild option. Silverback is built for riders who want an aggressive, high-output M8 capable of 160+ horsepower with the right supporting parts and tune.
Taverner Motorsports supplies, builds and dyno tunes the Silverback at our Bowen Hills workshop in Brisbane, with Australia-wide shipping.
What is the A.P.E. Silverback?
The Silverback is a drop-on 128ci big bore package for riders who want the most serious naturally aspirated performance A.P.E. offers.
Included in the Silverback package:
128ci A.P.E. cylinders and pistons
Ported cylinder heads
Extra compression
Large camshaft profile
Upgraded valve train components
Larger throttle body and injectors, if included
High-performance supporting hardware
Who Is Silverback Best For?
Riders chasing maximum naturally aspirated M8 performance and 160+ hp
Riders who want strong top-end rush and aggressive throttle response
Serious custom and performance builds
Riders who've outgrown the Street Performer or Sneaky Pete
114ci and 117ci M8 owners moving to 128ci
Recommended Supporting Upgrades
To reach its full 160+ hp potential safely, a Silverback build usually needs the following. We'll quote these separately based on what your bike already has:
High-flow exhaust and air cleaner
Cam chest upgrades
Clutch upgrade
Oil pump inspection or upgrade
Flywheel rebuild (highly recommended at this output level)
A Silverback build is a serious engine project. Our Bowen Hills workshop handles everything from teardown, head work and flywheel rebuild to final assembly and a dyno tune matched to your air cleaner and exhaust. Every job is covered by Taverner Motorsports' workshop warranty and A.P.E. manufacturer parts warranty.
Serious street performance & stronger acceleration
Cam Options
Large Camshaft Profile & Upgraded Valve Train
High-Performance / Aggressive Cam Profiles
Best For
Riders demanding the ultimate, most aggressive NA package
Riders seeking a strong road bike with big performance numbers
Main Benefit
Peak performance capability and raw engine power
Strong road performance without maximum NA aggression
Why Choose Taverner Motorsports for Your Silverback Build?
At 160+ hp, every detail matters: head work, compression, flywheel condition, oiling and fuelling. We plan each Silverback build around your bike and riding, check every supporting component, and tune on our own dyno for safe, repeatable power. As an authorised Alpha Performance Engines specialist and installer, we've completed hundreds of A.P.E. builds for riders across Australia.
FAQs
Some of our most commonly asked questions are answered here. For other queries please contact us directly, so our team can assist you.
Is Silverback suitable for daily riding?
Does Silverback require ported heads?
Is Silverback more powerful than Sneaky Pete?
Does Silverback need a flywheel rebuild?
Does Silverback need dyno tuning?
How much does a Silverback cost in Brisbane?
Book an A.P.E. Silverback build consultation in Bowen Hills today
To review your performance engine options, contact our local workshop team or request a quote online. We welcome riders from Bowen Hills, Fortitude Valley, Newstead, New Farm, Teneriffe, Spring Hill, Herston, Windsor, Albion, Clayfield, Hamilton, and across Greater Brisbane.
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159 Abbotsford Road, Bowen Hills, QLD 40061800 697 433enquiries@tavernermotorsports.com.au.png)
