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Installation Instructions: Subaru CS600 & CS600X
Long Block Block Assemblies

Before Starting
During the break-in process, we recommend using a high quality API SJ or newer mineral 20W-50 engine
oil. We also recommend using a genuine Subaru oil filter. Do NOT use a synthetic or synthetic blend
during the break-in process. Replace the oil immediately after the break-in procedure or 500 miles
(whichever comes first). We also strongly recommend priming the engine’s oil system before starting. To
do this, make sure there is no fuel or spark by disconnecting either the ECU or by removing the
appropriate fuses and/or relays. Then crank the engine until there is oil pressure registering on an oil
pressure gauge (you or your mechanic must install one). When first starting the engine, be sure to keep
the engine speed above 2000rpm to ensure the tappet buckets and cam lobes have adequate oil.

Engine Break-in
It is critical that your Cosworth engine is not started with an excessively rich fuel mixture. An excessively
rich mixture will wash away the oil in the cylinders and the rings can potentially never break-in causing
excessive oil consumption, crankcase blow-by and lower power output. This damage is permanent.

If the engine will be broken in by driving the car, we recommend you keep the engine speed below 4000
rpm. Drive the vehicle at various loads, speeds, and throttle positions while keeping engine speeds below
4000 rpm for approximately 1000 miles or 1660 kilometers. The longer the engine is broken in, the better
your results will be. If breaking your engine in on an engine dynamometer, follow the break in procedure
detailed below. You can use the guideline for a chassis dynamometer as well, but load readings will
differ. If using a chassis dynamometer make sure to keep water temperatures below 95 degrees Celsius
and oil temperatures below 110 degrees Celsius.
• Run at 2000rpm @ 50-60 lbf-ft. load for 20 minutes
• Run at 3500rpm @ 90-100 lbf-ft. load for 20 minutes
• Run at 4250rpm @ 100-110 lbf-ft. load for 10 minutes
• Run at 4250rpm @ 125-135 lbf-ft. load for 5 minutes
• Run at 5500rpm @ 125-135 lbf-ft. load for 5 minutes
• Run at 5700 rpm @ WOT for 2 minutes (not to exceed 300 lbf-ft.)
During the final break-in stage, the boost should be limited so as not to exceed 350 lbf-ft. of torque.
Some initial ECU calibration activity may be required to complete break-in with proper air fuel ratios. The
engine should be calibrated to achieve an air fuel ratio rich enough for the type of fuel you are using.
Consult with a professional tuner if you are unsure of an air fuel ratio the engine requires. Boost should
be regulated so as not to exceed 300 lbf-ft. of torque during the break in process. Once ECU calibration is
complete up to 7000rpm, the short block should be ready for a WOT, full power run throughout the entire
power band.