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Adding a 180-egree thermostat is thought of as the normal thing to do for a pushrod street-stroker build. Stevie suggested using the lower-rated 160-degree 'stat or Cheaper Sleeper's bullet. Some believe the 160 is too cold or this application and upon every startup may effect engine temperature to a point where the ECU never transitions to a Closed Loop fuel map, thus running rich. However, Modotek's BlackBox 2.0 - a slick new engine - management system that we discuss elsewhere in this report - has provisions or compensating for this situation and averting lean conditions with the cooler 'stat.