Contour Enthusiasts Group Archives Forums Modifications 3.0L Duratec Some additional 3.0 questions

-- Decking heads on these motors is a bad idea.
-- The only reason to use the 2.5L heads is for more compression.
-- 2.5L exhaust valves are too small for a high rpm 3L motor, especially with SVT cams. They might be ok for the standard 3L intake and rpm range though as they will keep the low-end torque even higher.

-- SVT cams take advantage of 4K-7K+ rpm ranges. This requires the engine be able to breath at that high an rpm range. THe Taurus system is designed for lower RPM torque and hence requires less total airflow. The SVT cams count on a dual runner intake system to help keep the low-end torque high while allowing the high-end breathing to make large amounts of power. Using them requires that you open your intake and your exhaust.

-- 2.5L headers will fit the motor but will not mate up to your stock taurus exhaust system. They may also interfere with the driveline or frame so you would have to take a look and compare to some of the undercar pictures that have been floating around CEG.

-- The 3L engine is a bit oversquare and can rev very high. It should be no worse than a standard 2.5L for revving up to 7000+ rpms. Recommendations for max RPM range is about 7600 though I'd personnally play it safer and run it between 7200-7400.

Tom

Oh yeah, these are my opinions/recommendations and I support them with both fact and circumstantial evidence; they are not necessarily 100% correct. They are just "what I'd do" if I were in your situation, but then so far the stuff I do works out OK in the end.