Circle Track Crate Engine Technical Manual - Chevrolet Performance

Installation Instructions
Each engine comes with detailed instruction sheets. This section includes some of the information
that is included in those instruction sheets. It is imperative that the startup procedures are followed
before starting the engine. Failure to do so may result in catastrophic engine failure. These
procedures are designed to ensure engines are properly broke in for maximum engine life. Two key
factors affect engine life; proper valve lash and keeping rpm’s within specified limits.
Valve Lash
Valve lash is critical. Read the procedures closely. All three engines do not have oil restrictors.
This insures ample oil is available to cool the valve springs and pull heat from the valves.
Break-In Procedures
GM has detailed break-in procedures to ensure the life of your engine is maximized. Failure to
follow these break-in procedures will shorten the life of the engine. Make sure you read this page
completely before attempting to start your new engine.
Tune Up Specifications
Tune up specifications are provided for each engine to insure that they are tuned to factory
specifications. Altitude, humidity, and other factors will affect performance. Do not increase
timing more than factory recommendations. All three engines have had extensive dyno & track
testing to maximize horsepower using these parameters. Maximum performance will be achieved if
you keep the tune-up within factory recommendations.
RPM Limits
RPM limits are critical to engine life. Catastrophic engine failure can occur if the engines are run
above the factory recommended limits. Extensive dyno & track testing has determined the limits of
the engine. Under no circumstances is it recommended to exceed these limits. GM recommends
that all sanctioning bodies, track operators or promoters have rev-limits written in their rule book.
Maximum limit for 602 engine is 5500 rpm.
Maximum limit for 603 engine is 5800 rpm.
Maximum limit for 604 engine is 5800 rpm.
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