Help on cam selection

Greyhounds_AMX wrote: I should have given more of the details of those three cams - here they are:   1) Lunati 10100276: 268/268, 218/218, 0.488/0.488, 110 LCA, 106 ICL   2) Elgin E1041-P:     284/284, 218/218, 0.488/0.488, 110 LCA, 105 ICL   3) Isky 270-HL:       270/270, 216/216, 0.470/0.470, 108 LCA, 106 ICL These three are also fun to look at because they all use a different lift as the basis for their "advertised" duration (the first numbers I listed above). Comparing them all at 0.006" though shows quite a difference: 1) Lunati: 268/268 @ 0.006" 2) Elgin:  276/276 @ 0.006" 3) Isky:   274/274 @ 0.006" The Elgin cam used an advertised duration at 0.004" in order to make it look larger, while the Isky cam is advertised at 0.007" so it ends up looking a little smaller.

The way I figure it, the opening /closing figures at .050 are :

We are Hughes Engines, a Mopar exclusive machine shop. We just joined this AMC forum this morning (2/26/18). We are looking to provide more AMC services, and in this case, I think we can help. We have some exclusive "real" Mopar cam lobes that are designed to take advantage of the large 0.903" lifter diameter shared with both AMC and Mopar. All of our competitors use common GM 0.846" lifter cam lobes. Grinding lobes for the larger .903" lifters gives you faster rates of lift, more lift, and more area under the curve - giving you more power than the .846" lobe with the same sized (duration @ .050") cam. If you look at our website, http://www.hughesengines.com - www.hughesengines.com under " http://www.hughesengines.com/TechArticles/2choosingacam.php - Choosing a cam", we ask you 22 questions to make sure you get the best cam for your combination. 

I was considering The Isky 270-HL.  The catalog lists 9.5:1 CR.  Is this minimum recommended?