I recently received a question from a friend of a friend in Texas regarding the difference between a “Narrow Deck” and a “Wide Deck” Lycoming engine. This has been confusing to many, so let’s see if I can shed some light on the subject.
The difference between a Narrow Deck (ND) and a Wide Deck (WD) configured engine is easily determined by checking the specific engine serial number. The WD serial numbers end with the suffix “A,” such as L-0000-36A on an O-360 series WD compared to L-0000-36 on a ND.
There are a few exceptions to this, such as the O-320-H series and O-360-E series, neither of which have the suffix “A” but still contain WD cylinders. [Read more…]