Brad,Three years ago and many passes
down the 1/4 mile along with many street miles,I built my 266 cid.
[250 bored to 4"] and have had no problems
at all. This overbore has been done many times. I did consult Tom Langdon of Stovebolt. and took his advise to have the block sonic checked for any core shift. Of the two blocks I have done myself, both had over the min. .100 wall thickness after the
boreing as advised by Stovebolt...
What ever you do, goodluck and enjoy the Inline Six..
