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It sounds like you've tried the methods suggested for assembling alloy engine parts. As suggested by others, check the cam for straightness first. If straight, proceed to the next step. Making allowances for a bent cam is not suggested for longevity. The components in each "stack" on each bank must be identical to arrive at an identical cylinder/cylinder head clamping force.
Install the other cam in the housing and see if the symptom is the same. Bent or distorted housing? I would think a used housing in good condition would be cheaper than sleeving, then remachining a crooked bore.
Sherwood
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