Flex Hone size for 312?


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By pcmenten - 16 Years Ago
I'm probably over-thinking this, but it seems like the typical y-block bore size doesn't have a Flex Hone that matches well. I'd like to brush hone the walls after running the glaze-breaking cylinder stones in the bores. The 3 3/4" is just a hair too small for my 292 +.040 (3.79"), and will be rather too small for a .060 over 312 block (3.86") that I have.
By pegleg - 16 Years Ago
Paul,

     I don't actiually know what hones you're using, but the flex hones will accomodate a range of bore sizes. Also, since the Buick V6's are also 3.800 stock, that's a common size. Check at NAPA and ask.

By simplyconnected - 16 Years Ago
pcmenten (4/13/2009)
...it seems like the typical y-block bore size doesn't have a Flex Hone that matches well...

Spend $20 and get a K-D (#2833) that ranges from 2"-7":
http://www.sjdiscounttools.com/kd2833.html

This one comes with correct stones (~220 grit).  Use plenty of kerosene and keep your crosshatch around 45*.  Hope this helps.  Dave

By pcmenten - 16 Years Ago
I have a Sears Craftsman glazebreaker and I bought new stones for it, but I'd seen a microscopic view of the results of using honing stones. The stones tend to 'smear' the metal. A brush hone does a better job. I will use the glaze breaker to start, but I'm going to finish with a brush hone.



I ordered a 3 3/4" Flexhone, and I'll order a 4" Flexhone for the 312. I figure if I run the hone in both directions, I'll minimize the smeared metal effect. They make a 4 1/8" Flexhone, but I didn't see any 3 7/8" Flexhones.