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84 bird, was 305 now 355. Changed from v-belt to serpentine. Serpentine system from early 90s pickup.. 5.7. The fan pushes air verses pulls, fan/waterpump run counter clockwise from front of engine. A couple of questions, will a reverse blade fan pull verses push. If yes, does anyone have a part number for a blade that I can run a clutch fan with? And, will my ac work ok with this setup? Thanks, a quite confused Byron

8t2 z-chev

firebirds came with 17"fan blade-I think mustangs,~1981-85,had a 7-blade,17" reverse rotation clutch fan-also could trim a larger reverse rotation fan down to correct diameter as long as job done perfect so fan turns true and is balanced.

Buickstaged

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Thanks, I know the 17" is correct.. Any additional info on ac and rotation would be greatly appreciated. Thx b

8t2 z-chev

if a new fan blade is wanted,flex-a-lite #5917 looks suitable.Another possible OEM fan that might be suitable if you don't mind a late model plastic one is 4cyl.colorado/canyon-fan on my 06 canyon has 7 deep pitch blades and pulls a lot of air even at low idle-i'll check diameter next time I have hood up.Probably can use '88 up A/C lines?-presuming the pickup serpentine setup is close to a thirdgen setup.'86 up thirdgen A/C condensers are higher fin density than earlier ones,but don't know if any difference in performance could be noticed between early and late condensers.

robotic_junky

Here is one for clutch style counter-clockwise (reverse rotation) 17" mechanical fan. http://www.summitracing.com/parts/der-17917/overview/

Also did you change your water pump because you need a reverse rotation water pump?

jmd

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when I pulled my serpentine set-up in a salvage yard, I found a fan blade from an S-10 blazer with serp. to use.

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The water pump was changed, the water flows from driver side to passenger side, or from top to bottom. The water pump is a flat or no groove pulley. I will do some more checking on the fan blade, thank you to all that responded. I will let you know the outcome. Thx byron

t-top havoc

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^^ ^^ ^^

IMHO, this or as jmd did.

Buickstaged

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I ordered the derale 17917 blade today. S/b here on Monday or Tuesday. Will give feedback. Thx b

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Ttt

robotic_junky

I bought the Derale 18" clockwise clutch style fan that uses a v belt for my 72 C10 a few weeks ago. It works just fine and is sturdy, unlike flex style fans which can bend and break. Only problem, like that review said, was the holes seemed like a 1/16" off. I put the bolts in and tighten them up anyways and it still worked fine.

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Robotic, when you say clockwise, are in driver seat or in front of car looking at the fan blade? This is a crazy issue, my first 3rd gen rebuild... Great help from many folks here on the forum. And it is much appreciated.. Byron

robotic_junky

This is when you are standing in front of the car.

V-belts have the fan going clockwise(look at the water pump).





Serpentine belt goes counter-clockwise(look at the water pump).
88-92 had this style.

Buickstaged

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Robotic, yup, that could be the picture for the motor I put in. I do believe the derale blade will fix my issue. Thanks for the clarification on the two set-ups as well as the clockwise/counterclockwise rotation. Byron

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Ttt