I know this isn't a new topic, and I hate to start another, but I have a supposed jdm h22a motor. The code is H22A-3041094 (*location* Just below exhaust port) above that code is HM (only stating because I'm curious what that means)
Cylinder date (middle cast stamp) is feb 97 not sure what other casting reads one arrow points to e in the alphabet cast stamp (left most stamp). other casting with an arrow points points straight up with other hash/tic marks (right most stamp)
then on far right reads P13/HF-1. I found a link and word doc of engine serials, but apparently that's too much for my $1,xxx gaming laptop to handle. Any info is greatly appreciated!!! Sorry if topic is bland or old!

 

H22A is JDM, if it was a USDM engine, it would be H22A1, H22A4 etc,
The HM is just Honda Motors. If its a little HMO in an oval, that's just the stamp that it came from H Motors Online.