something like that.

while trying to hunt down a spec sheet for one, i noticed that there was an A14T forklift engine... which might be found in the nissan powered concrete pumps.
Industrial A15 specs W/ Dyno

what is an H25 engine? there are a bunch of engines we never see for industrial apps

The H-series engine was used in the Datsun 2000 Fairlady Roadster, IIRC. The H25 must therefore be version of the same engine.

See http://en.wikipedia.org/wiki/Nissan_H_engine, and add the information you got on the H25 to the article.

yeah i was wondering if the H25 industrial was the same line or something else, since it wasn't used since the early 70's

Everything i see would make me think the forkllift motors are a 9:1 compression round port head. They are intended to spend their lives running under 3600 rpm. Peak HP @ 3600 rpm - 46HP at intermittent duty, 36 continuous. They are very conservative, at 36 HP that engine will run forever.