The stock CVO 110 heads out flow CFM wise a 50 MM stock FBW unit.. I have not used the 600 in a 110 as the stock comp ratio is too low to properly support the cam , However I have used the 600 with the 113 kit with stock heads ( yes zero porting) 58 bolt on FBW unit and it has gone repeatably over 120 Hp and tq in the 127-130 range .
two examples pf the 600 with no head work and 10.5-10.6 comp ratio ,
Myself have tuned way too many of these engines with stock units and not one has ever gone over 117 hp , and we tried , you mioght get it there but cam would have to be large and mega comp ratio and even then I think the tq curve would suffer down low.. SO understand what I am saying.. With a proper kit that produces good low range the 120+ mark I feel is not going to happen.. In fact you can do the math based on CFM and the unit cannot get there its a restriction.. I have run 124 engines with stock units and still not able to get there.. But with all of that testing I could be wrong
Port matching is one thing that I feel gets mis used term wise... Core shift is one thing that creates a issue.. The bolt holes are set up to be drilled its not an item that gets set up based on where the port really is.. SO lets say the head is great and the port is flowing as it should, but its slightly shifted , so now you want to enlarge the port opening to make it a smooth transition.. This sounds like a good method , however when ti comes down to what really works vs theory .. well lets say that I have tuned bikes that had 1.800 manifold running on a box stock 103 head head with a 1.660 ish port .. you would think that it would hit that step and cause issue.. Well we in fact have seen it many times as we did not build it just tuned it.. and they will get the right manifold we re check it nothing happens.. have seen too small of manifold on a 1.800 port nothing there either.. So the point is I would never blow our opening out to match up the manifold its not as crucial as its made out to be ..
A slight mis match in alignment is not un common and its not just in the HD world autos are the same.. Sure guys spend big money inthe auto side to match it I did.. We re tested my engine on the engine dyno , I had 5 hours in doing the work myself and it did not make and change at all .. But I am only a 406 11.1 pump gas , maybe on a true race engine there would be a gain,
Back to spend money and re test..
here is an odd ball I have tried to do this build again and could not, no idea why it made the crazy show box tq curve as stock heads 113 kit and re used the owners 259 cam with a dd pipe .. ( i have tried twice and could not re produce the tq curve ) HP gets there but this is the highest I have seen.
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