Larry is Larry Smith from Flow Tech 2 Cylinder heads. He is a longtime porter with a bunch of time spent with the NASCAR crowd. He has been able to get some pretty impressive numbers out of both the 240's and the 270's. He did a set of 240's for another member on the list and was able to get low 370 cfm's out of them with only (I believe) a 6cc increase in port size. The numbers posted above are for a different members set of 270's.