[Bob Carriere]

Hi Alex

Part of my problem is that I have 4 other cab 12 to check, look at, crawl all over but ONLY the one cab 11.

The nose assembly of the cab 11 and cab 12 is somewhat different..... and my truck had been re-engined with a GMC 228 with all the necessary tweaking modification required. so I am robbing off the cab 12s for parts and idea. some of the fasterners were bolts on the cab 11 but on the cab 12 they are tapered/recessed bolt heads like wood screws.

I suspect that my rad is tilted slightly too far forward...... but can only move back so far before I hit the risk hitting the fan.

Grant....... we will need to remove the axtra rubber spacer on the wish bone rad support..... that will move us 3/16 lower.

From the old pictures I haev taken fo the truck before disassembly both the rain gutter and the rad cap was very close.....

One of the possibilities is that when the rad was "recored" the new core might have been a fraction of an inch taller..... or the rad sits taller in the rad support soldered on the new rad..... a fraction here a fraction there and you suddenly have parts rubbing....

Alex..... if I can't have a look at a cab 11 nose locally I may call on you for some close up pictures.

Meanwhile look at the enclosed old pictures to see how tight clearance where originally.

Bob

PS (Post Scrotum) space is very tight at the filler cap...so much that the tabs on the cap would prevent the rad cap from turning properly..... and notice how the filler neck is actually soldered at a slight angle.
On the cab 12 the filler pipe of the rad is about 1 1/4 inch longer providing additional clearance.
I have a spare cab 11 rad and the same tilted rad pipe is installed. I may try fitting the old original spare cab 11 rad to see if size "really matters".....