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Not sure that anyone has picked this yet, but it would appear that this whole problem has started from using the Ford Roller Cam lifter components in what is a non roller cam block, you should use roller lifters with a link bar setup similar to normal mechanical roller lifters in the type of cyl block used here, the whole valve train assy needs to be re-evaluated for this motor, includeing any valve piston contact issues along with what appears to be retainer/rocker contact
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Good point, I do see a number of other little things that should/should not be in this type of performance stroker motor.....definetly a major problem with the valve train geometry, and unless than is rectified, the same thing will continue to happen with this engine.....
David