I have the LS1 fans off a vette. it covers well over 75% of the radiator. Should I dump these fans and go with the Gm fans from the newer trucks. which do you think are better. One thing i do like about the GM fans is that they look factory. thats always good.

 

as long as you can seal the shroud up against the radiator, those fans will be fine. My flexalites don't cover the whole radiator, but when they're running you can feel it sucking air in thru the grill area. can you find out how many cfm those ls1 fans are? the flexalite are 5000/5500cfm. so anything around there should be good...