Power, rpm, displacement and airflow are all related. It has been found, that maximum power capability can be predicted, when airflow is known, as well as the rpm where this power will be made, with a very good degree of accuracy. This prediction applies to an intended racing engine with optimized parameters like cams, exhaust, CR etc.
Suppose that on a 12v 3liter, with std heads and std runners, we want to use the wildest cams, highest CR and big headers...the max power possible would be about 236hp at 6700rpm. Before you rejoice, consider that the CR used for this will be around 12 and the cams+headers would probably make the beast useless in the low range.
Now, if you somehow had looong intake pipes, it doesn't mean max torque would move lower in the scale, just that the shape of the curve would 'rock' around the max, increasing a bit lower and decreasing higher in the range. The same effect you would have with long/short headers.
Too much head flow, means you move your expected max power higher in the range. I will (again) remind you of the excellent 1990 M3 evo head...178cfm, indicating max power to be around 310hp at 9400rpm, which happen to be almost the exact actual numbers for the particular engines (the best examples of which in the old ETCC made even more power, 350@9500!)
You now start fiddling with our 3liter heads and while power capability may go up, so will rpm! For the 24v, things are worse! Sure it can make power, lots of it, but the revs can go over 9K !! Remember, this is the maximum capability! Lower cams etc will lower power and revs, suit yourself (and your pocket!). Therefore, anyone contemplating V6 racing power must be definitely prepared to buy suitable rods and (I would suggest) pistons.
I hope this helped put things into perspective.
Still, I prefer interviewing Playmates!(....Here we go again!)
![Laughing :lol:](./images/smilies/icon_lol.gif)
Jim K.