I would have to say 8:4:1 or so they were kind of detuned so i don't know for sure.
The compression ratio on a 1992 Ford Mustang GT 5.0 liter was 9:1
11.2to1
It has a compression ratio of 17.5:1
9.01:1
acording to an s.a. book the horsepower of the 1971 400m is 260 @ 4400rpm. the torque is 400 pound feet @ 2200rpm. the compression ratio is higher on the 1971 400's than any of the other year models. after 1971, all 400 and 351m's had a compressoin ratio of 8.4:1. the compression ratio of the 1971 400 was 9.0:1. acording to an s.a. book the horsepower of the 1971 400m is 260 @ 4400rpm. the torque is 400 pound feet @ 2200rpm. the compression ratio is higher on the 1971 400's than any of the other year models. after 1971, all 400 and 351m's had a compressoin ratio of 8.4:1 or either 8.0:1. the compression ratio of the 1971 400 was 9.0:1.
The compression on a 1992 Ford Mustang 5.0 is 9:1
9.0
The 4.0 L - V6 engine in a 1999 Ford Ranger has a compression ratio of ( 9.0 to 1 )
9.5 to 1
According to the 2001 Ford F-150 owner guide the 5.4 liter compression ratio is 9.0 to 1
My 1991 Ford Mustang 5.0 liter V8 ( LX ) had a compression ratio of ( 9.0 to 1 from the factory ) ( 8th " character of VIN was an " E " )
According to the 1998 Ford Expedition Owner Guide : For the 4.6 and 5.4 liter V8 engines : The compression ratio is ( 9.0 to 1 )