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GM was commonly used in that year model truck but the mazda was also an option.
There were 3 GM engine models used: 4-153, 4-181 AND 3.0L engines and only 1 Mazda model engine M4-121G

one way to tell is to look at the valve cover

The GM valve cover is long straight and has filler cap near the rear of the cover and PCV valve at the other end of the cover.

The Mazda (M4-121G) engine is different in that it has a slant to the valve cover, a breather in the middle in the slanted part and the filler cap on the rear side of the valve cover.

Note: orientation may sound confusing but when i say "rear" of the engine it is the "actual" rear of the engine. It does sit in the truck backwards so keep this in mind.
  • Posted 24 Aug 2016 08:59
  • By swoop223
  • joined 23 Mar'12 - 3,692 messages
  • North Carolina, United States
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PREMIUM business

Hawker Powersource, Inc.
HAWKER® offers a range of hybrid motive power solutions customized to adapt as your operation's needs change.
Global Industry News
edition #1252 - 16 October 2025
In this week’s Forkliftaction News , we report on the GEP Global Supply Chain Volatility Index which shows Asian supply chains are at their busiest since June 2022 while the US and Europe’s supply chains remain under-utilised. One of the report authors describes the situation as being “as stable as it’s going to get”... Continue reading
Editorial calendar - planned features
CONSTRUCTION FORKLIFTS
HANDLING GOODS IN THE COLD
LOADING/UNLOADING FREIGHT
BROWNFIELD AUTOMATION
FORKLIFT ATTACHMENTS
BATTERY AFFORDABILITY AND LIFETIME
FORKLIFT SAFETY