How to Tell HD213 from Green Diamond?

John, did you ever learn anymore regarding if you have indeed the GRD or HD engine? I have an early 1937 D-30 with the a 213 cu-in engine and same 61963-HH block part number. I suspected that mine may have been swapped out at one point in its life as the fan shroud was missing and they had welded up some almost homemade looking engine mounts.

The motor in my '39 D2 Panel truck has a 61963-HD casting number with an International triple diamond symbol and a date code of 2-5-J. And it uses studs to hold the head on. I believe that this is the HD motor and not the GRD. In order for it to be the green diamond motor, it needs to actually say "Green Diamond" inside the diamond symbols like on this green painted motor.

I never really found anything definitive, but I read where the HD heads have rounded corners vs the much sharper corners on the GRD head. So if anything - according to that observation, I have the correct HD213 engine for the truck.

The motor in my '39 D2 Panel truck has a 61963-HD casting number with an International triple diamond symbol and a date code of 2-5-J. And it uses studs to hold the head on. I believe that this is the HD motor and not the GRD. In order for it to be the green diamond motor, it needs to actually say "Green Diamond" inside the diamond symbols like on this green painted motor.

The head on your engine has the sharp edges that I was told belong to the GRD. The head on my engine is MUCH more rounded along the edges.

Thanks for the info on the heads. To be clear, the green painted motor isn't mine. It's a picture from the internet. My motor is the picture before it with no head. But I can see the sharp angles you are talking about on the green motor. If I need to find a head for mine, I will know to get one that has more rounded edges for my HD motor.

Hi guys. I have a 213HD in my 40 D2. Same stamp on the block of 61963-HD. Date stamp of 12-22-I. The head is 213HD as well with date stamp 12-18-I. Would this make the motor cast in Dec 22, 39 and the head cast 4 days earlier? Part number 87170-H is also stamped on the head. HD213 is also stamped by hand on the front drivers side of the block above the generator and near the water pump.
Thanks
Bartman
PS my apologies the photo should be rotated 90 degrees clockwise

I'm not sure about the date stamps, but you present a clear case, so it could very well be. I wish my motor had been stamped clearly like yours - would have saved a lot of dithering