Fan shroud problems

[Solver]

Got my engine back in and got her almost ready to fire up (just the plug wires fluids,tranny kickdown cable left).
Got the fan and shroud on tonight and just as I was finishing up I spun the fan and the darn thing hits the shroud on the driver side. I took pics and it looks like it's lined up properly. I am pretty sure it was for a 3 core or smaller cause I had to shim it out to fit radiator properly but the problem is the offset doesn't seem right! I have about 1 1/2- 2" clearance on passenger side and rubs on driver. Only thing I can think of is maybe the fan shroud is for a 4 wheel drive. Does the shroud offset that much more with a 4 wheel drive or is there something I am missing here? The spacing on the upper raiator mounts lines up pretty close so it bolts on right --just that darn offset

[Boog]

Is the radiator core support centered between the frame rails? I can't tell whether you have your fenders on or not either. If the support is sitting too far to the passenger side the blades could rub the shroud. Engine looks to be centered. Tranny crossmember all bolted up?

[al's71gmc]

This is probably a stupid question, but is the shroud upside down?

[byrd]

Al maybe on to something, it does look funny.

[Boog]

The mounting holes are spaced different between the top two and the bottom two so it couldn't mount upside down.

[sameyrasmea72]

My very first 67-72 that I bought in 1991 was “missing “ the fan shroud. When it started having over heating problems, I went to add a shroud and had the same problem. After hours of frustration I finally realized the frame was slightly bent and caused the offset. This lead to a frame change and a two year restoration and I think to 15 year hobby with these trucks.

I am sure this is not the problem you’re having but I thought it was worth mentioning

[Green Machine]

Wow, all of our trucks are closer on the passenger side, not driver side. Try measuring from the crank center bolt to the frame. On our 68, I loosened up the frame to engine mount bolts and put a bottle jack between the frame and the balancer (no I don't think I bent the crank) to get it more centered. I could get some measurements if it would help.

[Green Machine]

Here's a couple quick measurements off of the 70. Inside of fender flat part to shroud center round part outer edge is exactly 24 inches both sides (tape at a slant), outside edges diameter is 19 1/2.

[Solver]

Thanks for the input guys.
Tom I went out and measured and the engine seems to be in Straight.
I did measure the fan shroud and that is where the difference is
The driver side of the fan shroud is closer to the center line by about 1 1/2"
from outside edge of shroud to round opening is 6" while the outside pass side to beginning of opening is only about 4 1/2 ". For some reason the fan shroud is offset . Must be for some other vehicle or designed to run with really short fan blades. In fact the first fan setup I had on there really didn't even clear the opening all the way around. Guess I'll try running without till next chance at the junkyard. Truck still needs the box done anyway

[qksilver]

Motor mounts?

[corn]

I went out & checked out the stocker on my 396 that Im sure isnt exactly the same but its all factory for the truck. I measured the centerline of the engine in the shroud & the centerline of the shroud itself. I do have to add that the top of yours looks a lot like the bottom of mine but it doesnt look like you can flip them over. A good way to tell is there is an indentation in the shroud for the petcock. The green in the pic is the shroud centerline & the red is the engine centerline. I also measured to the inner edge of the fenders to the outer edge of the radiator mounts. Hope it might help you a little...

I kind of messed up the pic a bit, the centerline measurments are to the inside of the mounts. In the pic they go to the outside. The only ones that I measured to the outside are to the fenders...

[Blue85]

Wouldn't be for a 6cyl would it? someone once told me they sit a little over to the passenger side.

[corn]

My shroud radiator & engine all came in my truck & its not centered...

[Boog]

Solver, does it have the fenders on it and have you had the hood on it? Reason I ask is the front end has to be square in order for the hood to fit right. If the core support is too far to one side or the other the fan can make contact with the shroud. There is room at the core support to frame mounts to move it right or left an inch to inch and half. If the front sheet metal all lines up right then the radiator will be properly positioned in front of the engine, so should the shroud. I don't know the history of your build but is it possible the frame horns are both bent to the right?

[PanelDeland]

Blue 85,I have never seen more than just a mini/guard shroud on a 6 unless it was aftermarket.Did they make more of a shroud?
I would guess that being off center would mean either the frame/core support/engine mounts/or shroud is either the wrong one or out of adjustment.It may also be a combination of all those factors adding up to that much difference.

[corn]

Id almost put money on this. Go out measure yours (everyone), Ill bet its not centered. Anyone? Im interested in finding this out myself...

[Solver]

Thanks everyone for the input and Corn for the pic. I do have everything installed but the hood. Engine in V8 (front holes) and all the bolts went in on the frame stands without even pushing or pulling on the engine. Tranny mount was alittle skewed and thought maybe I had it in backwards but measured that today and the tranny mount holes are centered so even if I had the front of the tranny crossmember pointing backwards it shouldn't affect. I checked pics on internet last night and it seems all the shroud pics I found kind of showed an offset in the shroud hole location 4" one side 6" on other. I decided it was to much to think about so this morning I just swapped in a bigblock shroud I had tucked away as I have more of them than small block shrouds anway. Worked Fine!!!
So for now till hood goes on and I find out if I am skewed --Progress
Thanks for all the ideas to check for!!