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.

[bobm67]

Originally Posted by 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.

Thanks for posting this. I didn't know what H.P. [SAE] meant. My MSO has 51.2 wish comes out to a 327.

[Steve Shauger]

I used that # years ago to help determine it was a 427 Copo Camaro. I had an MSO from a 350, 396 camaro and the COPO was higher than both of those, so I deduced that is was a 427, among other things. Now I have the formula to prove it !!! Thanks....

[scott s]

Thanks its just another feather in its hat,its no doubt a real 427/435 car not just by the untouched indicators on the car itself but i have spoken with the 2nd owner who purchased the car in 1968 and he confirmed indeed its one of the real ones.....and maybe one of the rare rare ones???