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Unfortunatelt we are blessed with horrible cam tunnels. As already discussed we have:

1) cam tunnel misalignment
2) bore sizing all over the place
3) thin bearing walls, which distort much easier than say a BBC. You rarely ever have to touch a BBC bearing, as the " cage" is much much more rigid. As mentioned, the thinner BBM bearing shells distort way easier.

Its often the number 4 bearing. Inexperienced installers often seem to crush the #1 and #5 bearings worse as well. If you use an expandable type installer instead of the solid untis, you need to keep the rubber sleeves good and snug so the installation ring isnt bouncing, with really adds to the bearing shell distortion.

Just more of the fun...

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I do a lot of small Fords too....Never had any problem with those as well...Just part of the deal.

MB