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Dead Parrot · 03-15-2018, 08:22 PM

My 75 350 with auto trans and AC has 7. The other common option is 5. Go for 7 with a standard duty clutch. IMO, a HD clutch locks up at too cool a temp. With a standard clutch, temps stay good even on 105* days running the AC and towing stuff.

Another benefit is no roaring fan noise running down the road.

Don't think there is any difference on the fan/clutches until they switched to the serpentine setups.

Most aftermarket temp senders don't play well with the OEM gauges. There are many threads on the subject.

03-15-2018, 08:22 PM	#2
Dead Parrot Registered User Join Date: Aug 2012 Location: Oklahoma City, OK Posts: 2,663	Re: How many fan blades in thermal fan clutch 79 350 My 75 350 with auto trans and AC has 7. The other common option is 5. Go for 7 with a standard duty clutch. IMO, a HD clutch locks up at too cool a temp. With a standard clutch, temps stay good even on 105* days running the AC and towing stuff. Another benefit is no roaring fan noise running down the road. Don't think there is any difference on the fan/clutches until they switched to the serpentine setups. Most aftermarket temp senders don't play well with the OEM gauges. There are many threads on the subject.