Rasp Burr Finish Experiment (Porting)

Ironracer said

Interesting...what's the general consensus on How Much the Gains would be ? You think its worth removing an old Holley Strip Dom, and grabbing new gaskets?

Click to expand...

I’ve researched and am still finding threads/posts going back to about 2010 or so regarding “burr finish” I want to say I’ve seen posts/comments even older than that maybe as early as 2003? where the term “textured” is used. Speed-Talk shows up quite often, along with countless others and from what I’ve garnered is that it does make a noticeable difference in throttle response, times slips at the track, and with jetting. As to HP/torque gains that, again based on the myriad of comments out there, ultimately depends on each combo. Seems it’s agreed that any gains won’t show on the flow bench.

I can tell you the time it takes to do what I’ve done vs using sanding rolls to polish to say a 60 grit finish, polished etc is much less.

I’ve mentioned earlier in this thread my reasons for trying a different approach to attaining a similar result. It was simply that I didn’t want to source a pricey burr, try to bend it just so etc. Like mentioned by RRR, whatever gets the job done.

Having the manifold clamped/held down is a must to be able to bear down on the burrs, really get them digging into the material to get the troughs and sharp/rough texture.