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Who has the earliest H- Motor? Or?

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I just purchased one today that is H-3148 it does have another stamp that is further away, but it is not a number.
The 2 holes where the tappets go have been ground down. I almost didn't buy it, but I have another early H-motor that has very similar scenario.
Has anybody seen this before, and will it affect the performance?

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I wonder if this is H-3148, or if it is H-31480
The last stamp is further away, and it doesn't look like any number, maybe the letter G?
I would like to think that this is #3148
It does have the early font compared to the later H, J, 300, and 700 motors.
Any thoughts?
 
Below are some pictures that help identify early H model engines.
There are many differences in the early crankcase, but I pointed out most of the obvious ones.
MOTORS (1).jpg
MOTORS (2).jpg
FONT (1).jpg
FONT (2).jpg
HEAVIER MOTR MOUNT (1).jpg
HEAVIER MOTR MOUNT (2).jpg
ACCESS HOLES.jpg
BACK MOTOR MOUNT.jpg
BEARING PLATE (0).jpg
BEARING PLATE (1).jpg
CASTING BUMPS (1).jpg
CASTING BUMPS (2).jpg
COVER HOLES (1).jpg
COVER HOLES (2).jpg
OIL GUTTER.jpg
ROLL (1).jpg
ROLL (2).jpg
 
There are lots of cool little differences between the two crankcases.
Early on Whizzer must have decided to improve a few things.
They took of extra metal around the motor mounts, but then made the trenches longer.
They added rolled edges inside the crank case. (maybe for better oil flow)?
They added the little gutter that leads to the tappet. (probably so oil could get to it)
On the 300 series, there is no gutter. (perhaps they used a different gasket shape)?
If you really pay attention, almost everything about the early crankcase is different.
I love this stuff, and want to learn as much as possible about these old motorbikes.
I hope you guys enjoyed this!
 
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