Pros:
* Torque: The 455 is known for its prodigious torque, which is ideal for launching off the line. This is its biggest strength for drag racing.
* Availability of Parts: While not as plentiful as some Chevy big blocks, parts are still readily available, especially for the more popular versions.
* Modifiability: The 455 responds well to modifications, allowing for significant power increases with various upgrades like aftermarket heads, camshafts, and induction systems.
* Relatively Lightweight (compared to some other big blocks): This helps with the car's overall weight and performance.
Cons:
* Block Strength: The 455 block, especially earlier versions, can be prone to cracking under extreme stress at high horsepower levels. This is a significant concern for serious drag racing applications. Strengthening the block is often necessary with high power builds.
* Head Flow: While modifiable, the stock cylinder heads can restrict airflow compared to some other big-block options. Upgrading to aftermarket heads is frequently done for higher horsepower.
* Rotating Assembly: The stock internals are not built for the extreme forces of drag racing and will likely need upgrading for high RPM and high horsepower applications.
In short: The 455 can be a very competitive drag racing engine, but it demands attention to detail. A successful build requires careful planning, strong components (potentially aftermarket), and skilled engine building. Addressing the block strength and head flow limitations is crucial for reliably handling the high stress of drag racing. If you're building for serious competition, it's likely to need more reinforcement and upgrades compared to some other choices. But for a strong and torquey street/strip application, it can be a fantastic option.
