* Specific engine code: The engine code cast into the block (e.g., L48, L82) determines the factory-specified camshaft, carburetor, intake manifold, and other components, all impacting horsepower and redline. A low-compression, workhorse engine would have lower horsepower and a lower redline than a performance-oriented version.
* Modifications: Any aftermarket modifications (camshaft, carburetor, headers, etc.) will significantly alter the horsepower and RPM limits.
* Condition: An engine's age and maintenance history dramatically affect its power output and reliability at higher RPMs.
While a stock, low-performance 1979 Chevy 350 truck engine might have had a redline around 4,000-4,500 RPM and perhaps 150-180 horsepower, a higher-performance version could rev higher and produce considerably more power. Without knowing the specific engine code and its condition, any horsepower or RPM figure is purely speculative. You'd need to find the engine code and consult a parts catalog or engine specification chart from that era to get a closer estimate of its original factory specifications.
