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