While a 426 Hemi was a factory option and large, significantly larger engines have been successfully fitted with extensive modifications. This includes things like:
* Fabricating custom engine mounts: This is crucial for larger engines.
* Modifying the firewall: Often necessary to clear larger engine blocks or intake manifolds.
* Modifying the chassis: Might be required to accommodate a wider engine or larger components.
* Custom headers and exhaust: Essential to route exhaust around modified components.
* Tubing the chassis: A significant modification often done to race cars to handle the increased power and stress.
You'll see builds with engines far exceeding the 426 Hemi's displacement (426 cubic inches). However, these often require substantial modifications, pushing the boundaries of what's considered practical and even structural soundness. Some people have even fitted monstrous big-block engines from other vehicles.
In short, the "biggest" is limited only by the extent of the modifications and the builder's skill and resources. There's no hard limit.
