I have a set of mild street port heads on my 95” TC wit HQ39g cams, bored 48mm TB and Lowcat 2-1 exhaust. Been thinking about getting better flowing heads to bump power. I have attached the typical flow sheet for the heads (each set is not flow tested) and description of work done. I am wondering if I got some heads done from reputable shop with larger 1.90 intake and maybe a little bigger exhaust and recontouring of ports, will it be a noticeable bump in power on the street? Was looking at Kirby’s Stage 2 and Dan Vance raised port Stage 4 heads. Looking for increased torque, quick throttle response, and pull all the way to redline. If I was starting with a build right now, I would do the extra head work, but debating whether the power increase over what I have is worth the money. Also wondering about exhaust valve size with the HQ39 cam long exhaust duration - don’t want to overexhaust and give away power. I know no one can say for sure without seeing my current heads, but would you expect a set of stage one heads to be able to be used if additional porting is done. Current heads already have higher lift springs for the 39 cams.

Thanks for replies. Bike has plenty of compression now - ccp is 205 f/r. I would rather not give name of porter - don’t want any one flaming him. These heads gave a definite low-end improvement over the previous ported larger valve heads that came with my 95” BB. Just wondering what kind of power gains to expect from a mild street port to a Stage 2 head? When I ran a FatCat with louvered baffle, I had around 98hp/105tq. What the difference between a hot rod and touring head work?