polo708

Im currently trying to get a hold of a new 07 SGT. I was looking at the modifications list and it states that the compression ratio of the motor is different... Does anyone know what the C/R is on a SGT because the dealership had no clue. Actually, they knew next to nothing about anything Mustang related, haha.

dom92880

According to the Shelby website, the only thing done related to the engine is adding the Ford Racing Power pack. I would assume that the CR is still the stock 9.8:1.
"Under hood, the Ford Racing Power Pack increases the output of the naturally aspirated, three-valve, 4.6-liter V-8 to 319 horsepower, and 330 pound-feet of torque. The Power Pack includes a 90 millimeter cold-air intake and a new performance engine calibration for improved response. The high-flow exhaust system with X-pipe crossover offers better power delivery and a throaty V-8 exhaust note. A shorter rear-axle ratio is installed to capitalize on the Shelby GT coupe's extra power, especially accelerating off the line. For Shelby GT models equipped with a manual transmission, a Hurst short-throw shifter is installed for more precise shift action."

07GTEddy

No internal changes are done to the engine at SAI. It is the factory C/R for the 07 model year from ford.