Who's running milled 317's???
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It depends how much the 317s were milled. The farther you mill down a head the farther your flow decreases so if you try and make a 317 have the same combustion chamber as a 243 head you will have heads that flow less. Also take into account that milling the heads that far will also kill piston to valve clearance not allowing you to run as large of a cam as you may want.