Help need new fan and have some questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Navy_chief · 07-25-2011, 06:52 PM

Guys,
I am going back all stock on the Desert Fox right now it has a piece no a pile of #$&^ fiberglass fan blade attached that is all cracked.

I have a 1977 GMC factory 454 radiator that I will be putting in place of the aftermarket piece of %^&* plastic side tank radiator.

Anyways I am needing to know what the stock fan set-up should be on the 1977 GMC SB 400 with factory air and which way rotation wise it should go I.E. Normal or reverse the engine has the long water pump also a 5 blade or 7 blade I also still have the facory fan shroud in place any help would be greatly appreciated.

Dan1969 · 07-25-2011, 07:20 PM

My 350 has a 3 blade.... yeah...

Navy_chief · 07-25-2011, 09:54 PM

Btt
Posted via Mobile Device

ray_mcavoy · 07-25-2011, 10:56 PM

Quote:

Originally Posted by Navy_chief

Anyways I am needing to know what the stock fan set-up should be on the 1977 GMC SB 400 with factory air and which way rotation wise it should go I.E. Normal or reverse the engine has the long water pump also a 5 blade or 7 blade I also still have the facory fan shroud in place any help would be greatly appreciated.

Hi Navy_chief,

Dad's 77 GMC has the factory SB 400 and it has a 7-blade clutch fan. His truck doesn't have AC but it does have the large radiator that I believe was used with most all 400's and 454's.

If you're using the original V-belt setup, you'll want a normal rotation water pump, fan, and fan clutch. The reverse rotation stuff is only for the serpentine belt setups that drive the water pump pulley off the back (flat side) of the belt.

Navy_chief · 07-25-2011, 11:30 PM

Quote:

Originally Posted by ray_mcavoy

Hi Navy_chief,

Dad's 77 GMC has the factory SB 400 and it has a 7-blade clutch fan. His truck doesn't have AC but it does have the large radiator that I believe was used with most all 400's and 454's.

If you're using the original V-belt setup, you'll want a normal rotation water pump, fan, and fan clutch. The reverse rotation stuff is only for the serpentine belt setups that drive the water pump pulley off the back (flat side) of the belt.

Thanks Buddy that is exactly what I needed to know

07-25-2011, 06:52 PM	#1
Navy_chief Registered User Join Date: Jun 2011 Location: Chickasha, Oklahoma Posts: 99	Help need new fan and have some questions Guys, I am going back all stock on the Desert Fox right now it has a piece no a pile of #$&^ fiberglass fan blade attached that is all cracked. *I have a 1977 GMC factory 454 radiator that I will be putting in place of the aftermarket piece of %^& plastic side tank radiator.** Anyways I am needing to know what the stock fan set-up should be on the 1977 GMC SB 400 with factory air and which way rotation wise it should go I.E. Normal or reverse the engine has the long water pump also a 5 blade or 7 blade I also still have the facory fan shroud in place any help would be greatly appreciated.

07-25-2011, 07:20 PM	#2
Dan1969 Registered User Join Date: Jun 2011 Location: OK Posts: 76	Re: Help need new fan and have some questions My 350 has a 3 blade.... yeah...

07-25-2011, 09:54 PM	#3
Navy_chief Registered User Join Date: Jun 2011 Location: Chickasha, Oklahoma Posts: 99	Re: Help need new fan and have some questions Btt Posted via Mobile Device



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