[SP01715]

Originally Posted by GEE TEE

My engine is #180, built in 2005, it now has 13,500 miles. Since I'm the third owner of the car/engine I doubt Roush will help me out with the performance issues. In fact, I've contacted them twice asking for carb tuning specs (jets, power valves, diaphram springs) so I could verify my carb is as it came from Roush. So far, no response. There are lots of things I'd like to know about this engine (recommended plugs/gaps, timing, advance curve) but Roush is keeping quiet. I have eliminated my tip-in stumble through a coordinated attack on initial timing, advance curve, idle speed, idle mixture, and diaphram spring change. The jets and power valves should be OK based on the AFR plot on a recent dyno sheet I received with the car. The car is much more driveable now although it still won't idle below 1100RPM, and it bucks and complains if I ask it to cruise below 1800RPM. Maybe I'm just asking too much from an engine with a big (how big is Roush proprietary info) cam.

Call Lance at Hillbank. He has the direct number to the department at Roush that builds these motors. He called the guy on a sunday on his cell when I had a question, and I had my answer in about 5 minutes.