5 blade vs 7 blade clutch fan

Can you tell me the aluminum 7-blade fan part #? I have an original fixed blade 7-blade steel fan cooling my big block with 180F stat and 2-row Griffin 26" radiator. it stays 185-190 almost all of the time. However, if I'm idling in traffic longer than 15 minutes, which does happen occasionally, the engine temp will start to rise past 200. What surprised me is that I was stuck in a complete traffic jam dead stopped for 25 minutes and the temp rose to 230. I'm wondering if the aluminum 7-blade clutch fan at idle would keep it cooler. Not sure if the pitch could be different or maybe aluminum spins more freely being lighter weight?

mopardude318 said

Just thought I’d update this thread since I started it.
I ended up using the 7 blade fan shown in my original post, with the MP viscous clutch, on my ‘74 W200, original radiator and shroud. It’s a rebuilt 360, 10.5:1 compression with a little baby cam not worth mentioning. I have a Stewart Components 180* thermostat and I tell ya, the sob does not get any hotter than 180.
I’m driving the truck right now in 90 degree weather all over town, it stays at 180.

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