[C2] AC engine Fan Usage

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Dec 5, 2021 | 05:12 PM

pop23235

Thread Starter

Le Mans Master

Joined: Feb 2012

Posts: 5,407

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From: Glen Allen VA

AC engine Fan Usage

Anyone have the scoop on when/what circumstances GM installed 7 or 5 blade, steep pitch fans? Especially for small blocks.

Dec 5, 2021 | 08:47 PM

SI67

Melting Slicks

Joined: Apr 2006

Posts: 2,331

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From: Sunnyvale CA

Quote:

Originally Posted by pop23235

Anyone have the scoop on when/what circumstances GM installed 7 or 5 blade, steep pitch fans? Especially for small blocks.

1963-Early 1964: 5 blade, steep pitch, with round head rivets
Late 1964-1965: 7 blade
1966-1967: 5 blade, steep pitch, with flat head rivets

Dec 5, 2021 | 09:08 PM

pop23235

Thread Starter

Le Mans Master

Joined: Feb 2012

Posts: 5,407

Likes: 1,216

From: Glen Allen VA

Quote:

Originally Posted by SI67

1963-Early 1964: 5 blade, steep pitch, with round head rivets
Late 1964-1965: 7 blade
1966-1967: 5 blade, steep pitch, with flat head rivets

Thanks

Dec 5, 2021 | 10:05 PM

68hemi

Race Director

Joined: Nov 2003

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From: Cottonwood AZ

C1 of Year Finalist (performance mods) 2019

Quote:

Originally Posted by SI67

1963-Early 1964: 5 blade, steep pitch, with round head rivets
Late 1964-1965: 7 blade
1966-1967: 5 blade, steep pitch, with flat head rivets

Maybe you are talking about cars with factory A/C?
My 65 is in the body shop right now but I THINK mine with original engine and components has the 5 blade. It is NOT a factory A/C car.
Also it should be noted that the 5 blade fans LOOK as though the would be out of balance.