BPE CRATE MOTOR BOOST. ROOTS VS CENTRIFUGAL SUPERCHARGER. WHO DOES BOOST BETTER? CHECK OUT THIS TEST COMPARING A TORQSTORM CENTRIFUGAL SUPERCHARGER TO THE 671, POSITIVEDISPLACEMENT, ROOTS SUPERCHARGER. BOTH BLOWERS WERE COMPARED ON THE SAME 383 SBC POWER ADDER CRATE MOTOR FROM BLUE PRINT ENGINES. TO SPICE THINGS UP BEFORE THE BLOWER TEST, WE ALSO RAN THE POWER ADDER 383 STROKER WITH A ZEX NITROUS KIT! IT'S ALL HERE.