Quote:
Originally Posted by s13silvia123
I was looking for stage 4 flow numbers so i can compare mine later on
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Can the P12 head even be "machined" to stage 4?? As mentioned above, they have the water jackets right above the combustion chamber, so you are already limited in that sense and you cannot machine the P12 to the extent of the P11.
Also, as we have mentioned (hanz and I), lb for lb for P12 head does not perform much better than the P11, especially if you "upgrade" to P11 (int) valves. One of the reasons the P12 flowed more was due to the int valve stem diameter being .5mm thinner than the comparable P11 in addition to 30mm exh valves on the P12 vs the 29mm on the P11.