Based on the fact he said 6 liter....I'm assuming its an LS.
Anyways, how many CFM's do your fans flow? Are you running a shroud? Pusher fans are usually less effecient than pullers, and they're an air flow restriction as well.
If you have an OEM radiator support, notch it and tilt the radiator forward so you can fit some big boy fans in there. Check out Derale fans. They have some that flow 2000CFMS each.
Or ditch the lame LS swap and put something cool in it. Like a JZ.
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