What has been your experience with cam/compression ratio/and type of gas? I am looking for recomendations.
We are building a performing daily driver 200 with OZ head, Holley 4V (350 cfm), duraspark/MSD6al, T5, and headers. We will be putting in a cam (probably in the 270 range). With this cam and running pump gas - hopefully regular - what is the max compression ratio we should shoot for. To provide an out, if the compression turns out to be too great, we are planning the build toward 87 octane gas and a 0.045 head gasket so we will be able to lower the compression with a 0.055 gasket and if need be go to higher octane. We are running at sea level in hot and humid north Florida.
To kick off this discussion, with the stock cam Falcon Performance Handbook's rule of thumb recommends the compression ratio be limited to the octane of the gas. This is in keeping with the original design of the car: 9.2:1 compression ratio back in the day when regular gas was 92 octane.
Clifford reports that with a performance cam (not specified) they run 10.0:1 on pump gas - because of the cam.
So what has worked?
Thanks, Dave
We are building a performing daily driver 200 with OZ head, Holley 4V (350 cfm), duraspark/MSD6al, T5, and headers. We will be putting in a cam (probably in the 270 range). With this cam and running pump gas - hopefully regular - what is the max compression ratio we should shoot for. To provide an out, if the compression turns out to be too great, we are planning the build toward 87 octane gas and a 0.045 head gasket so we will be able to lower the compression with a 0.055 gasket and if need be go to higher octane. We are running at sea level in hot and humid north Florida.
To kick off this discussion, with the stock cam Falcon Performance Handbook's rule of thumb recommends the compression ratio be limited to the octane of the gas. This is in keeping with the original design of the car: 9.2:1 compression ratio back in the day when regular gas was 92 octane.
Clifford reports that with a performance cam (not specified) they run 10.0:1 on pump gas - because of the cam.
So what has worked?
Thanks, Dave