1. Chevrolet 350 Small Block (2-Barrel): Approximately 250-270 horsepower
2. Chevrolet 350 Small Block (4-Barrel): Approximately 300-325 horsepower
3. Chevrolet 350 LT-1 (4-Barrel): Approximately 330-360 horsepower
The Chevrolet 350 LT-1 engine, introduced in 1970, was a high-performance variant of the small-block 350 engine and offered higher horsepower compared to the standard 2-barrel and 4-barrel versions.
It's important to note that these horsepower figures are approximate and may vary due to differences in engine tuning, modifications, wear and tear, and overall maintenance history of the engine. To determine the exact horsepower of a specific 1970 4-bolt main 350 motor, it would be best to consult with an automotive expert or perform a thorough inspection and testing of the engine.
