Rad is the one that was in there with the 3.5.... Looks standard kit and fits across the whole width of the gap in the 110.
3.5 ran constant temp.
Moved same sender unit over to the 3.9 and it has always run cool.
Stat changed as assumed it was stuck open. 88 degree stat installed and it appeared to be running hot.... Took it out and stuck 82 degree version in.
Connect up the electricery and is was running at 77 degrees, fairly consistently.
Installed another 88 degree stat (managed to drive over the last one and destroy it) and new VDO + calibrated sender gauge showing running at 60 ish. Will connect up electrickery for official number one evening this week.
I'm assuming the new stat is stuck open as there was no evidence of the temp climbing while driving last night.
Temp came up fine on tick-over and fans cut in at the required 88 degrees. (According to the VDO gauge)
Don't believe the stat is being bypassed as temp was holding at 77 degrees previously..... Plumbing all standard...
Ordered another 88 degree stat while ordering other parts onlien last night so will check temps and have another go later this week....
I'll also do as suggested Ralph and boil my collection of stats to see when they are opening and closing, if they are...
Neil