66 vs 67 BB Fan Shroud

[David S.]

Are 66 and 67 BB Fan Shrouds the same? Do both save DS GT on them?

Thanks,
Dave

[Richard M.]

Re: 66 vs 67 BB Fan Shroud

My 53-70 Parts Book says yes, 66-67 (427) uses.......

Main Part# 3938940 $27.00, Upper Part# 3888269 $7.40

The 3938940 is also used on '68 A/T & '70 (exc 4/Spd, 454, SHP 350)

....don't know about DS GT.

Rich
p.s. prices are in 1970.

[Wayne W.]

Re: 66 vs 67 BB Fan Shroud

My 53-70 Parts Book says yes, 66-67 (427) uses.......

Main Part# 3938940 $27.00, Upper Part# 3888269 $7.40

The 3938940 is also used on '68 A/T & '70 (exc 4/Spd, 454, SHP 350)

....don't know about DS GT.

Rich
p.s. prices are in 1970.

Problem is that later over the counter parts are fits all and while they might work, they might not be technically correct. My opinion is, that later parts counter part, will have the sawed off angle on the RH side, and thats not correct for 66,67 except maybe very late 67.

I think that there were at least two versions for 66. one with the opening on the LH side and one not. I think 67s mostly had the opening cut out. All had the squared off RH side, except maybe some very late 67s.

[Joe L.]

Re: 66 vs 67 BB Fan Shroud

My 53-70 Parts Book says yes, 66-67 (427) uses.......

Main Part# 3938940 $27.00, Upper Part# 3888269 $7.40

The 3938940 is also used on '68 A/T & '70 (exc 4/Spd, 454, SHP 350)

....don't know about DS GT.

Rich
p.s. prices are in 1970.

Rich-----


The 1966 and 1967 fan shrouds were were made up of 3 individual pieces and assembled at St. Louis, probably in an off-line operation. The pieces for the 427 shroud were as follows:

1966-67 upper= GM #3888269

1966-67 left half= GM #3886887

1966 right half= GM #3886888

1967 right half= GM #3911110

So, as you can see, the right half of the shroud was different for 1966 and 1967.

Over the years, GM discontinued all of the individual pieces and replaced them with a complete assembly. The individual pieces were not all discontinued at the same time, presumably due to the fact that discontinuations of each only occurred when GMSPO stock of each piece was exhausted.

The complete assembly was GM #3938940. This was a SERVICE-only piece used to SERVICE all 1966-68 Corvette big block applications. The 3938940 was finally discontinued without supercession in September, 1995.

Curiously, the 1966-67 small block applications were not treated this way. For those, the three individual pieces originally used were available in SERVICE as individual pieces right up until the time each was discontinued. No complete assembly was ever available for small blocks. Why? I have no idea.

[Richard M.]

Re: 66 vs 67 BB Fan Shroud

Joe, Interesting info.....

Yes I see it now in the 1967 AIM, Sheet L36 A5.5. I should have looked there also.

I wonder why the right side was different on 1966.......TI or horn relay placement? I haven't seen a BB '66 in a while.

Rich

edit.... Okay I needed a break from Florida 96 degree outside bodywork.
I see in Noland's book that the TI & horn relay placement is the same for 66 & 67 so it's not that.

[Wayne W.]

Re: 66 vs 67 BB Fan Shroud

Joe, What is the 68 RH part number? That would be on the 68s with fiberglass shrouds.

I have never noted a difference in the 66-67 RH sides except for the late angle cut units, which are the same as the assembly 3839940 offered later.

[Michael H.]

Re: 66 vs 67 BB Fan Shroud

Joe, What is the 68 RH part number? That would be on the 68s with fiberglass shrouds.

I have never noted a difference in the 66-67 RH sides except for the late angle cut units, which are the same as the assembly 3839940 offered later.

If you tell me what to look for on the right side, I can check my 66. Or, I can take/post a few pictures.

[Joe L.]

Re: 66 vs 67 BB Fan Shroud

Joe, What is the 68 RH part number? That would be on the 68s with fiberglass shrouds.

I have never noted a difference in the 66-67 RH sides except for the late angle cut units, which are the same as the assembly 3839940 offered later.

Wayne------


The 1968 big block shroud used three component parts all three of which were different than 66-67. These are as follows:

Upper= GM #3935569

Left= GM #3935571

Right= GM #3935572

I expect that the SERVICE assembly, GM #3938940, was an assembly of the above parts which were close enough to the 66-67 that they could be used for 66-67 SERVICE.