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Richard,
Glad the small block build worked out for you.
Just for the record the ratio of compression lost when you swapped to the Dart heads was probably costing you about 15 -20 hp if the cam was of any respectable race duration - more so if it was also on a wide LCA.
As for the porting on the as cast heads I can tell you that we have hand ported a couple of sets of these Pro 1's. With just the most basic of porting they responded very well to the tune of about 35 hp on a 11/1 500 inch motor. As for Darts NC ported BB heads we have flow tested these (will be feature soon in the second half of this story) and have recorded numbers within a percent or so of Darts. We have not done a back to back test but have seen over 850 Hp from a 10.5/1 540 street motor along with really good lbs-ft.
DV
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