Brush Research FLEX-HONE Cylinder Hone, GB Series, Silicon Carbide Abrasive, 3-1/2" (89 mm) Diameter, 240 Grit Size

Worked well

Quick ship and decent quality.

Thought I would have to take the block to a machine shop, but I'm very pleased with how it turned out. Used this with the Flex-Hone oil and the N55B30 engine cylinders don't have any more rust, are nice and sparkly clean with a beautiful cross-hatch. Great product.

Buy exact fit to the .10" or one .10" larger Working on a 22r Toyota stock bore 3.6". This hone did it's job with a nice cross hatch. However, the hone just barely hit the bore walls. Maybe this is by design but I feel I should have gotten the 3.75" bore hone as my bore size is 3.6" If your bore is 3.5" then you would be fine. The hone would have a bit of pressure on the bore walls. If you plan on honing a 22r look for the next size up. The balls on the hone wore down Farley fast making flat spots on most the balls. So when you use this you do not want to hone one bore at a time. Make like 2 passes per bore to break in the hone tell you have broke the glazing off the bore walls and broke in the hone, then work on your cross hatch pattern. Over all I like this hone and it's ease of use but the fact that I most likely will not be able to use it again, I may get one more use from it in 5-8 years witch would pay for it self then but a stone hone would be more cost effective. If you build the same 3.5" size bore engine all the time this hone would be ideal. Cause you can just grab put in drill and hone (adding cutting oil).

this ball hone is the right grit for cleaning the cylinder and cross hatching