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Does anyone know how it's possible for the cam to "walk" back and forth hitting the lifters with everything in place as it should be? The plate was on the front of the block. The more I look at it I just don't understand how it's even possible. I can't believe cam bearings are totally the culprit.
There are some FE cams that are cast with the spacer built into the cam end and some without. If a cam that has the built in spacer is used and a spacer is also used you will get the exact result you described. That is the usual cause of "cam Walk" in the FE engines.
Don't ask me how I know.
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