Tech: BG Engines shows how to build a stout Holden V8
Holden’s venerable Iron Lion V8 has seen a resurgence in popularity since the iconic brand was shuttered in 2020. GM-H fans can now pick up all manner of go-fast equipment for their Holden V8, including aftermarket blocks that swing up to 500ci, a range of early- and VN-pattern alloy cylinder heads, bolt-on blower kits, and more.
But here's where it gets controversial...
While some enthusiasts might argue that the Holden V8 is inherently limited in its potential, BG Engines challenges this notion by showcasing how to build a powerful and reliable Holden V8 engine. By focusing on aspirated, street-based, pump-fuel combos, they demonstrate that the Holden V8 can be transformed into a formidable performance machine.
And this is the part most people miss...
One of the key areas of focus for BG Engines is the intake system. They emphasize the importance of using a single-plane, four-barrel manifold to maximize power output while ensuring it remains under the bonnet. This approach is particularly challenging for Holden V8s due to their unique engine bay design, but BG Engines provides a solution that allows for impressive power gains.
Now, let's dive into the different levels of intensity...
ENTRY LEVEL
450HP-550HP
For those looking to build a 500hp Holden V8 on pump gas, BG Engines recommends a 355ci stroker, worked VN-VS EFI heads, a single-plane manifold, and a hydraulic-roller cam. This combination offers excellent value and performance, and it can be easily set up for either EFI or carb, along with various ignition, fuel, and exhaust systems.
But wait, there's more!
Damo, from BG Engines, suggests that with a bit more work and a 2.20in valve set-up, the engine can be upgraded to 550-570hp. This upgrade involves no custom parts, making it an affordable and reliable way to build a 500hp street Holden V8.
Now, let's move on to the next level...
TOUGH STREETER
550HP-650HP
As the power output increases to 600hp and beyond, the Holden V8 becomes a true streeter. BG Engines recommends sonic-testing and crack-testing blocks to ensure their integrity, and they offer the option to sleeve tired blocks to extend their lifespan.
And this is the part most people miss...
One of the key modifications BG Engines suggests is the use of a thin-wall sleeve to bring heavily bored engines back to 20thou, opening up piston options. This allows for greater flexibility in engine building and ensures that even with larger bore sizes, there are still plenty of piston and rod options available.
Now, let's explore the max effort level...
MAX EFFORT 650HP+
BG Engines has demonstrated the incredible potential of the Holden V8 platform by building engines that produce over 700hp on aspirated 109-octane race fuel. They've also shown that with the right modifications, such as the use of aftermarket blocks and heads, the Holden V8 can be transformed into a high-performance machine capable of producing impressive power figures.
But here's where it gets controversial again...
While some enthusiasts might be tempted to push the boundaries of the Holden V8 platform, BG Engines advises caution. They emphasize that once you start making significant modifications, such as running a lot of boost or nitrous, the only option is to use aftermarket blocks and heads. This leads to a custom build with high costs and long timelines, potentially moving away from the original Holden engine design.
