What type of oil to use in a 1967 327?

For a 1967 327 engine, it's generally recommended to use a high-quality conventional oil with a viscosity grade of 10W-30 or 10W-40. These viscosity grades are well-suited for older engines operating in a variety of temperatures. Here's some additional information to consider when selecting oil:

- API Service Rating: Choose an oil that meets or exceeds the API service requirement for your engine. For a 1967 327, look for an oil with the API rating of SG or higher.

- Synthetic vs. Conventional Oil: Conventional oil is a good choice for older engines. Synthetic oil can be used, but it's generally not necessary unless the engine has specific performance requirements or operates under extreme conditions.

- High-Zinc Oil: Some classic car enthusiasts prefer to use high-zinc oil in older engines. Zinc is an anti-wear additive that was more commonly found in older motor oils, but its levels were reduced due to environmental concerns. If you're concerned about engine wear, you may want to choose an oil that has higher levels of zinc.

Note: It's always best to consult your vehicle's owner's manual or maintenance guide for specific oil recommendations.