I've got an 87 Iroc with some minor mods. I'd say max 300hp if I'm lucky. I replaced the radiator with a new stock one. My fans are in pretty bad shape and my radiator upper mount is busted. I want to stick with the dual fan setup and have done some searches. I see a number of folks running Flexalite 210's. The description on this in Summit says for V8 up to 250hp (200 with air). According to that you shouldn't use that setup if you mod even the slightest bit. What am I missing? The Derale setup boasts moving 4,000 cfm for about $10 cheaper. I do plan on doing some small mods later on but I want to make sure I get a setup that will work now and later.

Any advice or opinions welcome.

 

There's a post about half a page down on cfm for cooling a 350.

 

Thanks Stekman. Not sure how I missed that.

Now I'm really confused. I did the 180 stat last year but never changed the temp switch so I just ordered the 200 on 180 off. I ordered new upper and lower radiator pieces last night for the stock duals. I have the primary hooked to the stat with the secondary on a manual switch. I usually throw that on when I get into the 230 range. I'm assuming that the broken supports are robbing me of a little cooling but probably not a lot. Does it even pay to get new fans once I install the new switch for the primary and get the new supports in place? I know it never hurts to replace old parts but I'm just wondering if I need to. Anyone replace just the fans and re-use the existing brackets/supports? If so, what was used?

 

Proper fan shrouding really is pretty important. Having the fans snug up against the radiator, or a shroud that extends from the radiator to around the fan is about as important as the fan cfm itself. The shroud ensures that the fan draws air only from across the radiator. So yes, do what you need to do to ensure that the fan sits flush to the radiator.

As far as needing new fans, I would install the switch and see how things work out.

Sorry, can't help you with the bracketry, I'm using a spal fan that just uses 4 "straps" attached to "rails" on my radiator.