555DTC Cold weather starting

[Diamondr]

So long ago I cannot remember.

It is 1 1/2 for the heater.

 

[BSHfieldmaster]

I had the LS dealer install a new block heater in the freeze plug on the left side of the block, it's a Shibaura motor just like my NH, the tech told me that it was 1 1/2" and he got it from NAPA, looks like a Kats brand, benn working in our latest deep freeze weather in Colorado!!