Lets totally add (derail) this thread! I think the C59 and C69 blocks are the only ones that you can probably have confidence in boring out past the .060 , without liners.
These motors though, as far as I know are from 1946 onwards , so depending on whether you are too concerned about trying to keep with the year of motor
that , for instance a Carrier or CMP came out with, the 99 mercury blocks are normally the ones to go for, and these can usually be bored to the upper limits
(.060 to .080 ) , without problems , just from my experience, Cheers Andrew.
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Valentine MkV
Covenanter MkIV
Lynx MKI and MKII
Loyd Carrier / English / Candian / LP.
M3 Stuart
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