Glossary of Terms

1BBL: One barrel carburetor
2BBL: Two barrel carburetor
4BBL: Four barrel carburetor
AWD: All Wheel Drive
FWD: Front Wheel Drive 
RWD: Rear Wheel Drive 
2WD: Two wheel drive
4WD: Four wheel drive
A.I.R.: Air Injection Reactor
A/T:  Automatic Transmission
M/T: Manual Transmission
S/T: Standard Transmission
ACC.: Accessory
AFM: Active Fuel Management (formerly known as displacement on demand (DoD))
BDR: Bolt down rocker (non adjustable)
CAM: Camshaft
CARB: Carburetor
CC: Cubic Centemeters
MM: Millimeters
L: Liter
C.I.D.: Cubic Inch Displacement
Ecotech: Emissions Control Optimization TECHnology
DBL.: Double
EXH: Exhaust
INT: Intake
MD: Medium Duty 
HD: Heavy Duty
HI PERF: High Performance
HYD: Hydraulic
MECH: Mechanical
OEM: Original Equipment Manufacture
RAM: Ram Air Manifold
V.I.N.: Vehicle Identification Number
w/: With
w/o: without
A/C: Air Conditioning
AUX: Auxiliary
NAT. GAS: Natural Gas
CNG: Compressed Natural Gas
LPG: Liquid Propane Gas
CAT CONV: Catalytic Converter
CYL:  Cylinder
MLS: Multiple Layers of Stainless Steel
E.G.R.: Exhaust Gas Recirculation
NGC: Next Generation Controllers
JTEC: Jeep Truck Engine Controller
SBEC: Single Board Engine Controller
VTEC: Variable (valve) Timing Electronic Control
VVT: Variable Valve Timing
ECM: Engine Control Module
HO: High Output
SHO: Super High Output
HP: Horse Power
FI: Fuel Injection
CFI: Central Fuel Injection
MFI: Multi Port Fuel Injection
SPI: Sequential Port Injection
DEFI: Digital Electronic Fuel Injection
EFI: Electronic Fuel Injection
SFI: Sequential Fuel Injection
TBI: Throttle Body Injection
OHC: Overhead Cam
OHV: Overhead valve
SOHC: Single Overhead Cam
DOHC: Dual Overhead Cam