DO CARB SPACERS HELP MAKE POWER? WHICH ONE WORKS BEST? CHECK OUT THIS COMPARISON (WITH FULL DYNO RESULTS) BETWEEN A 4HOLE SPACER VS AN OPEN SPACER ON A 360 DODGE MAGNUM CRATE MOTOR FROM MOPAR PERFORMANCE. EQUIPPED WITH AN M1, DUALPLANE, CARBURETED INTAKE, WE COMPARED THE EFFECTIVENESS OF THE 4HOLE DESIGN TO THE OPEN DESIGN. THE VIDEO INCLUDES CHANGE IN POWER AND AF CURVE. ALSO INCLUDED IN THE VIDEO IS A TUNING TESTEFFECT OF IGNITION TIMINGGOOD STUFF.