Beater, I think LeeLites is still lurking around here. He apparently has been watching this post and others, and I think he has called Tom a few times about this dyno testing. From some of the comments he has made on his auctions regarding the PES lumps, and how they should be installed. He had mentioned several times on these auctions and claimed, the PES still had superior flow even when ground and formed into a teardrop shape at the leading edge, compared to other lumps currently on the market. But also commented, that how much more would they flow when used in the manner in which they were originally designed, with the straight squared off leading edge, and an insert or ramp placed into the floor of the intake manifold. Well, we wanted to know as well, so we tested all 3 brands of lumps in the same cylinder head, just so that debate of one head being prepped or biased differently than the other wouldn't arise, and discovered that all 3 brands produced the exact same HP and torque #'s one to the other. Tom even went as far as to make and use the ramps in the intake manifold on the PES, just so that doubt or question could be eliminated from further debate also. So the bottom line is likely going to just fall onto it being more a preference issue than anything else as to which ones to buy or use. The very first dyno test that was conducted was with a bone stock head w/1.72" intake valves, and still had the bolt bosses in the head. Then the same head was swapped using 1.72" valves also, but also had lumps installed. We knowingly had a 40-50 CFM gain in head flow from doing this, but the engine didn't make a single bit more HP or torque whatsoever, not even 1 HP at all, so don't expect that if you do have just a few scant CFM difference in a head to see a miraculous gain of HP either, airflow just doesn't work that way, and if you do get a gain in HP, it isn't a proportional gain by any stretch of the imagination either.
