Hope you'll post a video of it running when completed. Did you have any port work done to the head? A smaller port volume with a raised floor of 3mms along with aligning entire port,etc would bias flow to match the lift of the cam,along boosting port velocity. Long rods can be beneficial in cushioning the power delivery but at a cost do to the pumping loses through the port. I'm building a long rod motor myself and after several years of flow testing will all sorts of port configurations imaginable,short side radius's, a D port intake showed the most gains in increasing port velocity over a conventional port tremendously without choking the port. The XS head loves it's floor raised with the short turn and corners laid back for a less erupt turn to the seat and valve. Leave the roof alone "DON"T TOUCH IT"your not concerned about upper flow above .440 lift,you want to match the port to the cam, you'll need to re profile the guide boss area though. You get the port right with those long rods and that cam and your competitors will chasing you down with dirt in their faces. Just passing along a few tips on the head by playing around, Good Luck to You
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Post a vid though.
