Trick Flow SBM Heads

Our buddy Tim has a set and wants to bring them over and do some testing one of these days on my flowbench. I didn’t take any measurements when I went over to see them at his shop but I did notice that the way they machined the pushrod holes it wouldn’t be as easy to open them up as they are on an Edelbrock Head. But without seeing what the airspeed is at the pinch it my be a non issue.
Yeah, he told me the last time I talked to him that he got a set for his sons car. I'm sure there are some gains to be had with a bit of effort. I practically begged Trick Flow to use a standard offset big block rocker on the head long before they were released. They could have pushed that pinch back at least another .150", and had rockers available without reinventing the wheel. Just slide them on small block shafts and go. I think they could still do an intermediate head that way, with say a 2.055 or 2.08 valve, and then do a larger offset race type head with a 2.08 to 2.100 and really move some air.