We have to get this Kohler section lit up on the board here,
I thought I would post some flow numbers out of a brand new, out of the box stock casting with absolutely no porting at all done to it. Every modification done is with puddy, or done to the valve, the head casting has not been ground or touched. All tests were done at 28WC.
The head is a 30hp Kohler command head.
Stock baseline test on intake port. 88cfm @.500"
The next test was done after the guide was pressed up leaving less then 1/8" exposed in the port:
89.5cfm@.500"
The next test was done after the stock intake valve was reshaped and swirl polished.
90.9cfm @.600"
The next test was done after the area around the guide was filled in with puddy on the roof of the port, at first a couple cfm was lost but after trying a few different shapes and removing some puddy it showed a huge improvement. A lot of time was spent here trying different things.
103.4cfm@.650"
Then the floor was raised and reshaped with more puddy and showed another big improvement.
108.4cfm@.650"
That is a huge improvement over the baseline readings, I thought it would be interesting to share the results before we start to do some serious port work on these heads.