Is this fan blade part number 3789562?

[Donald H.]

The fan blade in the pictures seems to be correct as part number 3789562 from a diagram and description in Nolan Adams book. The diagram and description is on page 118 of his book. His book also show this to be correct for 1963 with A/C and then used again in 66/67 A/C cars. Both the diagram and his text says the fan had 4 rivets.

However, the 1966 TIM&JG says the part number 3789562 had 5 rivets.

Also, the blades that LIC and Paragon sell for the A/C cars have 5 rivets.

Is this blade a correct 3789562?

Thanks,

Don Harris

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[Edward B.]

Re: Is this fan blade part number 3789562?

Don, the 67 and 68 Camaro with A/C or K02 (Fan, temperature controlled) used the same fan (3789562), and it's a 4 rivet fan. More info on this fan can be found HERE.

Ed

[David L.]

Re: Is this fan blade part number 3789562?

Don,

Your fan (18" dia., 3.00" bolt circle) appears to be GM # 3789562 but I believe that it is not correct for a 1963 or 1964 since it has flat rivet heads. The change from flat to domed rivet heads took place in 1964 or 1965 for Hayes-Albion fans (stamped "H"). Over the years I have had several fans exactly like your fan but I have never seen one with domed rivets.
The 3789562 Hayes-Albion fan and the 3863137 Schwitzer fan are both correct for 1966-1967 Corvettes 327 w/AC as well as passenger cars.

The 18" dia. Hayes-Albion fan with 5 domed rivets/blade is GM # 3749576 and was used on 1958-1963 PASS. w/AC, 1961 PASS. (348) , and 1961-1963 PASS. (327,409) as per my vintage Chevrolet parts catalogs. I have a few 3749576 fans still in my collection.

GM # 3749576 was replaced with GM # 3789562 in July 1964 which was then replaced with GM # 3931002 in May 1972 as per Chevrolet Parts History for over-the counter parts.

The 17 1/8" dia. fan (GM # 3770529 made by Hayes-Albion) has 5 rivets/blade (domed on 1960-1964, flat on 1966-1967).

Dave

[Edward B.]

Re: Is this fan blade part number 3789562?

Dave, can you post examples of the domed and flat rivets? I'm assuming the one's I've attached (front and back side shots) are the "flat"? (The two pictures below are from a 68 Camaro L78/Z28 fan #3871276, but I also checked my 3789562 fan and it's the same.)

Ed

[David L.]

Re: Is this fan blade part number 3789562?

Enclosed are 2 photos of a NOS a 3749576 18" 5-blade fan (58-63 Chevrolet) w/5 domed rivets per blade.

Dave

[Donald H.]

Re: Is this fan blade part number 3789562?

Thank you gentlemen.

[Edward B.]

Re: Is this fan blade part number 3789562?

Yes, thanks Dave.

Ed