Just thought I would resurrect an old post for two reasons.
One to say I got my sump gasket fitted OK. I glued it to the sump first with a small amount of silicone and after 15 minutes or so I applied a bit more silicone to the mating face and lifted it all into place. Seemed to work well and now leaks less than the old one!
Second to say that I got the thermostat out my friends 351C today as he was fitting a new radiator, and it was the wrong one. So was the new one he brought. Both Windsor types.
We have identified the correct Robertshaw thermostat 333-180 on Summits web page and have one on order.
Good job I looked really as I don't think the new radiator would have made much difference otherwise. Brass color restrictor plate is present and correct.
Craig.