C1 60 Fan and Fan Clutch part #?

[Mark P.]

I'm trying to help out a friend and need to know the correct fan configuration for a 60 Corvette fan and fan clutch. Part numbers would be helpful if possible!

From what I have read in the archives, it should be a standard 5 blade fan used from 60-70, should have a fan clutch and a spacer should also be used. He currently has an incorrect fan with no clutch and it overheats constantly. I assume the correct configuration will help immensely when the fan is positioned correctly in proportion to the shroud.

Any help would be appreciated!
Mark

[Jim D.]

Re: C1 60 Fan and Fan Clutch part #?

In 1960 the clutch fan was an option. The standard set-up is a 4 blade fan with an approx. 1 1/2" spacer that moves the fan into the opening of the shroud.

Jim

[Mark P.]

Re: C1 60 Fan and Fan Clutch part #?

His car is a higher horsepower car. Would fan clutch still be optional for all models? Also, it would seem to me that the spacing would be different if the clutch was omitted by potentially a couple of inches so the fan woudn't draw air as well in proportion to the shroud?
Mark

[Jim D.]

Re: C1 60 Fan and Fan Clutch part #?

RPO 121 cost $21.55 and was available with all engine options. Whether using the clutch OR the spacer, the fan will be in the same position.

[Mark P.]

Re: C1 60 Fan and Fan Clutch part #?

Sorry to disagree, but if a spacer is used between the pulley and the fan blade, how can the distance not be affected? That is one of the purposes of the spacer from what I understand, to move the fan closer to the optimum shroud /radiator position.

Mark

[David L.]

Re: C1 60 Fan and Fan Clutch part #?

The 3770529 5-blade fan (17 1/8" dia., 5 rivets/blade, 2 3/8" hub hole, 3" bolt circle) was optional on the 1960 Corvette. The 3770529 fan had "domed" head rivets from 1960 to about 1965 or so and "flat" head rivets after that until 1967 (the last year it was used on the production line). The fan-clutch part number in 1960 was GM # 3764830. GM # 3764830 was then replaced with GM # 3814560 on 9-13-61 according revision record in the 1962 Corvette AIM. A second fan-clutch was also added on that same date, GM # 3814137.

My 1963 Chevrolet Parts Catalog (effective Oct. 1962) lists fan # 3735314 for 55-60 Corvettes (8 cyl.)(exc. fan drive equip.) and is described as 17" dia., 1 3/4" bolt circle, and 5/8" shaft hole. The spacer listed for the 60 Corvette is GM # 3814241 and described as 2 3/8" O.D. X 2" thick. I sold my 1960 Chevrolet parts catalog several years ago so the part numbers may or may not be different. My 1957 Chevrolet Parts Catalog lists fan # 3735314 for the 57 Corvette so I would say the 3735314 fan is correct for 1957-1960 Corvettes (8 cyl)(exc. fan drive equip.).

Dave

[Jim D.]

Re: C1 60 Fan and Fan Clutch part #?

Sorry to disagree, but if a spacer is used between the pulley and the fan blade, how can the distance not be affected? That is one of the purposes of the spacer from what I understand, to move the fan closer to the optimum shroud /radiator position.

Mark

If you use the spacer, it does move the fan forward. If you use the clutch ( with no spacer), the clutch assembly moves the fan forward to that same position. You use either the spacer OR the clutch, not both.

[David L.]

Re: C1 60 Fan and Fan Clutch part #?

Enclosed is a photo of a 3770529 fan with "domed" head rivets. I firmly believe that the attached clutch is GM # 3764830 used on 1960-E1962 Corvettes. The coil type clutches used in later year years were similar but noticeably different.