What kind of flow numbers have you seen from untouched 318 castings? Particularly 675 castings. What flow bench and test depression did you use?
Started in on a set of 675 heads with no intent to flow them when done. Now the wheels are turning and I'm kind of curious as I'm actually putting some effort in them, and didn't do a before test. 1.94/1.6 valves, gasket matched to 340/360 port size, bowl work, short side rework, removing most of the guide boss. Shooting for 210 cfm range with high velocity.