Mysterious Stamping on 3770529 Fan Blade

[Henry J.]

While refreshing a 3770529 fan blade assembly for my 66 L79, I was surprised to find a small (~2mm high), but distinct, stamping of the numeral "4" on one of the blades (vanes) of the fan blade assembly.

Does anyone have an idea of its' significance?

[Mark F.]

Re: Mysterious Stamping on 3770529 Fan Blade

While refreshing a 3770529 fan blade assembly for my 66 L79, I was surprised to find a small (~2mm high), but distinct, stamping of the numeral "4" on one of the blades (vanes) of the fan blade assembly. Does anyone have an idea of its' significance?

A detailed, in-focus photograph will help knowledgeable folks on this TDB help you...

Also, were there any other "similar" stampings on any of the other blades ?

[Henry J.]

Re: Mysterious Stamping on 3770529 Fan Blade

There is not much to see...one small numeral "4" on one blade only.

[Bill B.]

Re: Mysterious Stamping on 3770529 Fan Blade

Henry,

You might want to email Joe Tripoli, as he is very knowledgeable about fan markings (he did an article in the Restorer a few issues back regarding fan assembly details).

[Henry J.]

Re: Mysterious Stamping on 3770529 Fan Blade

Here, I hope, is a picture of the mysterious numeral.

Fan Blade Numeral.jpg

[David L.]

Re: Mysterious Stamping on 3770529 Fan Blade

Henry,
It's been awhile since I checked my messages.
My original 1966 Corvette 3770529 fan (17 1/8" dia., 5-blade, 3" bolt circle, 2 3/8" hub hole, pitch measures 1 5/8") just had the letter "H" (Hayes-Albion, the manufacturer) stamped on the front and the letter "W" stamped on one arm on the back side. Attached to the fan was a Schwitzer clutch dated "SC 1-26-66". The "4" on your fan might represent the month of April, just a wild guess.

Years ago I had a 7-blade 1964-1965 Corvette w/AC fan, GM # 3853943, stamped "H" and "9" (or maybe it was a "6") on the front, the number "25" on one blade, and the letter "W" on one of the arms on the back side. I sold the fan to Pete L. back in Nov. 1993.
Dave