67 vette real 427/435 roadster

[COPO]

A little known fact is the HP on the MSO showing 57.8 conclusively establishes this car as a factory equipped 427. It relates only to engine displacement and not which particular 427. The formula is "Diameter squared times number of cylinders divided by 2.5 so using 4.25" bore size on a 427 engine yields 57.8

Some discrepancies have surfaced, but generally this is a reliable indicator of original engine displacement for a particular car. This number is sometimes shown on the title in some states and often referred to as "Taxable HP".

Congrats Scott another piece of the documentation.