C3 Fan help

[Dale P.]

Can anyone identify the #'s of our fan #3955182 or the thermostat housing #3877660

Thanks for your help!

[Joe L.]

Re: C3 Fan help

Dale----

No problem. The GM #3955182 fan was originally used for 1969 Corvettes with high performance engines (either L-46 or L-36) AND A/C. It continued as the L-46 with A/C fan for 1970. The GM #3955182 fan is of 7 blades and of 17-1/2" diameter.

In April, 1971 the GM #3955182 fan replaced the GM #3888366 fan blade for SERVICE. The 3888366 was originally used for many Corvette small blocks from 1966 through 1970. It is a 5 blade fan of 17-1/2" OD.

The GM #3877660 thermostat housing is a cast aluminum housing first used for 1966 Corvettes with base engine. It continued to be used through about 1972 or 73 for many Corvette engines. For 1968-70, it is correct for all engines except, as I recall, L-88. The design of this piece changed somewhat over the years, although the part number did not. It was still available in SERVICE until just a few years ago. This piece was not just used on Corvettes; it was widely used on Chevrolet small and big blocks from 1966-72 or 73.

[Dale P.]

Re: C3 Fan help

Thanks for the reply ..

So what is the correct fan part number for my May built 1968 427/400 HP
engine? Question 2) .. what fans were used on the L89 or L88 .... 68
motors?

Thanks again for all your help

PS where did you find this data ?? None of my books have information like
this?

[Jack H.]

Re: C3 Fan help

If memory serves, these PN's are called out in your copy of the AIM in the appropriate section that introduces the option (C60 for A/C equipped cars and the particular engine for non-base cars). Note, sometimes a very simple change from the base car is documented as a 'non-illustrated' item at the preface to the particular option....

[Joe L.]

Re: C3 Fan help

Dale-----

All 1968 Corvettes with 427 engines, with or without A/C, from L-36 to L-88 used fan blade assembly GM #3888366. This is a 5 blade, 17-1/2" OD fan.

The above-referenced fan blade was discontinued from SERVICE in April, 1971 and replaced by the 7 blade GM #3955182. So, if a fan on a 68 were replaced after that time with a GM-sourced unit, the 3955182 would be the one you got. However, the GM #3955182 was never originally installed on a 1968 Corvette.

[Dale P.]

C3 Fan help .. thanks to all for the info !! *NM*