[undy]

The frontal area of our Cobras is comparatively small. It's hard to fit a dual fan setup with our typical "narrow" radiator. If you do, the fans are so small that the single fan will still pull much more than the duals. On the CFM issue, Spal is the only fan mfr that I really trust when it comes to ratings. Working in the HVAC industry you grow to realize all CFM ratings are not the same. CFM ratings on puller fans are specified at inches of mercury. Bluntly spoken, their ability to suck. Most auto fan MFRs rate their fans at 0" of static pressure. That basically is a free air blow. That fan, say rated at 3000 CFM, when bolted up to a radiator shroud with a tight, thick cored radiator will now only draw 2000 CFM. It falls on it's face when you increase the negative static pressure. This can be a result of blade design, motor size and a host of contributing factors. If you're serious about obtaining a certain CFM try asking the MFR for a copy of the "fan curve" diagram for the particular fan you're interested in.

I do run the Flexalite 16" "pre-shrouded" Black Max setup. I think it was primarily intended for the 5.0 crowd. I did a little "shroud sculpting" and viola, it fit like a charm. You'll be surprised how much better your puller fan will cool, being bolted to a well designed shroud over being affixed directly to the face of the radiator's core.

Dave