A v8 will run hotter esp if you are running inner fenders. A shroud is key to making an electric fan work at its best. It also needs to be spaced a bit from the rad and not just laying flat on the core. A good cheap trick is to use aluminum cookie trays sized the closest you can find to the core size of the rad. Cut the hole(s) for the fan(s) and mount that to the rad.
87 blazer tahoe 2 door, 5.7, auto, sfa 4x4
91 noma reg cab, 3.4, 5speed, lowered President of the Arkansas chapter Anti-bagCoalition "Bags are for groceries"
A shroud is key to making an electric fan work at its best. It also needs to be spaced a bit from the rad and not just laying flat on the core.
I ran two 14" Perma Cools in a shroud that I made when I had the sbc's in my truck. My truck is/was way heavier than most S10's so it was under a greater load all of the time. With that setup I could pull a fullsized car or truck on a trailer in the middle of July and it would never heat up at highway speeds or setting still, so I know they can be made to work great.
Always mount them as puller on the engine side of the radiator and always shroud them.
'85 S10 4WD Ex-Cab Long bed, LLY/Allison/241/241, Locked 1 Tons with air-ride and 38's.