[bigjimzlll]

the bigger the cam(higher duration) the further up the rpm range the engine will make power..the 268 starts making good power around 2200-2500 rpm.....the 274 around 2500-2700..the 280 around 2800-3000..etc...you want your stall to be in the range that you start making good power..if you have a light car with a steep gear you can get buy making less low end power, because it dosent take as much to get it moving..so you can use a bigger cam...with a heavy truck...with 3;73 gears and a 2500 stall...you need as much power as possable down low to get it moving...thats why I went with a 268 cam in my rig...now that Im going to be going to the track more..im going with the solid cam...much more power down low and all the way to 6000 rpm