Not sure why but i know a well known respected head porter that loves to take his grinder to those dart heads.

 

After extensive searching, it appears the tfs heads are the cfm winner by about 10-12cfm on both intake and exhaust , with the next up being the profilers, profilers are better chamber size at 58cc to the tfs at 64, I’ll have to mill the tfs heads a good amount.

 

But every flow bench is different...

 

TFS has more CNC programs find out which is the Preferred TFS cathedral Castings 👌. Pro-filer does look good. RHS I'd think would have poor customer service, reference RHS LS7 heads and it's availability. Darts in the right ✋'s. Hmmmmm 🤔 in the right ✋'s any head can be made better.

 

Mamo FTW

 

Those TFS as cast 220's have a long history of being impressive

I don't have experience with the others, did some TFS 220's for a buddy once with a FAST 92 and the rest of the build was nothing special and it ran it's *** off for what it was.