* Engine design: Small-block Chevy 350s, for example, were produced over many years with varying designs and components.
* Compression ratio: Higher compression generally means more power.
* Carburetion/Fuel Injection: The type and tuning of the fuel delivery system significantly impacts power.
* Camshaft: The camshaft profile affects the engine's power band.
* Cylinder head design: Different cylinder heads offer varying flow characteristics.
* Exhaust system: Restrictive exhaust systems rob power.
* Modifications: Aftermarket parts like performance heads, intake manifolds, and other upgrades drastically change horsepower.
A stock, naturally aspirated (non-turbocharged or supercharged) 350 cubic inch small-block Chevy engine from the 1960s might produce around 250-300 hp. However, highly modified 350s can easily produce 400 hp or more, and some extreme builds can generate well over 500 hp.
