Factory specifications for 1972 350s varied. Some lower-performance versions might have a redline closer to 4500 RPM, while higher-performance engines could have a redline closer to 5000 RPM or even slightly higher.
You should not rely on a guess. The best way to find the correct redline for *your* specific engine is to:
* Check the owner's manual: If you have the original owner's manual, it will specify the redline.
* Look for engine markings: Sometimes the engine itself will have markings indicating the redline. This might be cast into the engine block or on a decal.
* Consult a Chevrolet parts catalog or service manual: These resources will often list specifications for different 350 V8 variations from that year.
Attempting to exceed the engine's redline can cause serious damage, including broken connecting rods, piston damage, and other costly repairs. It's crucial to operate the engine within its designed limits.
