they are talking about the engine codes.
Quote:
Honda’s engine codes are typically four or five characters in length. Japanese market (JDM) motor ID codes are always four characters long, while US spec (USDM) or other export motor codes usually contain five characters.
The first character of a typical Honda engine code is usually a letter, which denotes the series of the engine. The next two characters are typically numbers, which denote the motor’s displacement in liters. The fourth character is typically a letter, which denotes the particular model of the engine within the engine series.
Take for example the B18C, a very popular tuner engine originally found in the 1994-2001 Integra. The “B” indicates that the motor is a member of the B-Series engine family, the “18” indicates that the motor displaces 1.8 liters, and the “C” indicates the motor’s specific model within the 1.8 liter B-Series engine group (as opposed to a B18A or B18B). Another example would be the H22A motor found in Preludes and some Japanese Accords. In this case, the engine is part of the H-Series, displaces 2.2 liters, and is the “A” model within the H-Series family of engines.
As mentioned earlier, non-Japanese (USDM, UK, etc.) Honda engine codes will often contain a fifth character. A USDM B16 engine code might read “B16A2” for example, as opposed to the “B16A” stamp on a JDM motor. The meanings of these numbers are not specifically clear; most likely they are simply used to differentiate variants of the same motor sold in different regional markets.
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When i did grass tracking we used long blocks every time, IMO The torque is the key, You don't wanna be 7000rpm for 10 laps straight dialing up and down the gears to keep the power down+ The other reason we used long block engines it to get good traction weight over the front Axel. We used Volvo 340+440's which were 2liter long block SOHV so if some one can point you in the direction of a
long block high torque CHEAP Honda engine in a light chassis id' say winning combination.
I'd say steer clear of D+B series, too small unless you have a certain CC/CI limit.
And thats my Honda knowledge extinguished
**This is all IMO**
Because learning is fun 
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