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It was probably warped before you cut the webs. They usually warp from loose bolts in a previous life...
It can be machined flat assuming it's not too warped. If the flange thickness is reduced by too much, the intake flange may not line up under the heads of the bolts. They should be 12mm thick (.472").
HTH
It can be machined flat assuming it's not too warped. If the flange thickness is reduced by too much, the intake flange may not line up under the heads of the bolts. They should be 12mm thick (.472").
HTH