273 CAM

I use Isky 1012-C on my .060 over 273 with stock cylinder heads--best 12.72 ET @ 108 MPH. (A-833 four speed, 4.56 axle ratio, 600 CFM Holley DP, 10:5+compression)

Per Isky catalog:
Application: All out drags. 5000 stall. 4.88-5.13 axle ratio. 850+CFM
Carb. 12:1 compr

RPM-Range: 4500-8000
Value Lift Int/Ext: .580/.580
Value Lash Hot Int/Ext: .028/.028
ADV Duration Int/Ext: 312/312
.050 Duration Int/Ext: 274/274
Lobe Center: 104