Run the engine at 1500-2000 RPM for approximately 15 minutes
Verify and monitor oil pressure immediately after startup
Thoroughly check for any leaks or noises and shut the engine down to address the issues
Monitor the engine temperature as it warms up, do not let it overheat
Adjust the total advance and ignition timing to manufacturers recommendations
Make sure cooling system is working properly
Monitor all gauges and warning lights
Check all fluid levels daily
Avoid extended idling, vary speeds for the first 100-200 miles of driving, and do not do any heavy towing for the first 500 miles.
Change oil at 250-500 miles, then every 3000 miles or 3 months after.
On flat tappet cams, use conventional oil with a zinc additive for at least the first 500 miles. For high performance applications it is recommended to continue using zinc additives. Synthetic oil can be used after the initial break-in period.