Rasp Burr Finish Experiment (Porting)

Here is an attempt at replicating a burr finish on an intake manifold using common rasp burrs traditionally used in woodworking, vs. using a 6” single cut burr, which is required to be slightly bent, have teeth knocked off and carefully developed grinder control to achieve. From all indications it takes some practice to develop, and time to perform. This alternative may be a simpler way to get the same results without ruining a good burr, along with likely shortened grinder life running an out of balance and excessive chattering burr.

Tools used:

variable speed electric drill
Nordwolf 10-pc rasp burr set (for wood)
Milwaukee 6” hex extension
Trans fluid for burr lube as needed

EDIT: It may in fact not take much more time to settle on a finish, preliminary results look very good as shown in the following posts.