<VV> line/align boring cases

[djtcz at comcast.net]

When factories machine block these days the smaller holes are finished with boring bars that pass thru ruff starting holes to the far end, where they are well supported at the far end by a precise fixture before the cutting tool creates a single chip. I shudder at the prospect of being faced with trying to bore a string of tiny holes starting at one end, and having the final hole end up close to the original position.  Line/align  honing stands a much better chance of preserving the factory alignment (good, or bad).

Do the main bearing bores survive distortion free to the mileage the cam bores are worn oval ?

If the cam bore wear is big all around, cutting the case faces will not reduce the vertical dimension much. ().

--
Dan Timberlake

-------------- Original message -------------- 
Re: boring VW cases - which are shorter (with attendant shorter,stiffer boring bar requirement) than Corvair cases
third time the machine shop got out their 
measuring tools and found the center main .003" off center.