I had a CSI and had the same darn problem. After having them send parts to fix it that didn't I elected to send it back and go with a different starter.
Ford makes a high torque and a super high torque starter. This fixed my problem. Summit (and probably Jegs) has them both although they are not listed in the catalog. I believe the super high torque starter is around $200. My motor is 14.5:1 and this thing will spin the motor like crazy, seriously.
If nothing else has changed I would see about returning the starter and going with the ford.
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2001 Mustang "Mach 1" SVO siamesed 351 stroked to 417ci,Yates heads, solid roller,Trans King glide.
Best 1/4 ET 9.17 (ALL MOTOR)
Best 1/4 MPH 147
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