I got the ZK3LS set from Matco to do a 2.3 head and a cbr600 head a long time ago. I had no problems whatsoever even with the aluminum motorcycle head. I'm by no means a pro head porter but I am a tech at a dealership and still use this same grinder all the time and occasionaly the bits, I'ts some cheap Cummins grinder I got at a traveling tool sale. I'm going to use the same set to do my 289 heads.
Also I was looking in the catalog today and saw this:
MT2880L
And here's the link to the long shank burr sets.
http://matcotools.com/Catalog/toolca...&page=2耻
