NM51: Could be
Frank Mcgurks\'s article "Reworking the late model Chevrolet and Corvette Engines" your thinking of it says: (Page 7 Under Cylinder Head Modification)
"Increasing the compression ratio in an engine will add very close to 10 H.P. increase in engine performance for every full unit increase above the standard compression ratio. (For example, increasing comp. ratio from 7 1/2:1 to 8 1/2:1 will show a 10 H.P. increase.)"
MONGO
