AFTER READING PLEASE CHOOSE CLASS FROM IDLE QUALITY DROP DOWN
Class 1 (200 - 215 duration at .050)
Good idle Quality, low RPM torque & mid range performance.
Will work with stock or slightly modified engine, manual or auto transmission
Class 2 (215 - 230 duration at .050)
Fair idle quality, good low to mid range torque & horsepower. Will
work with stock or modified engine, manual or auto transmission. Possibly
lower vacuum than stock.
Class 3 (230 - 245 duration at .050)
Rough idle quality, good mid to high RPM torque & horsepower, for
use with manual or high stall auto transmission, may need improved carburetion,
exhaust & ignition systems, combination street & drag. Will have
lower vacuum than stock.
Class 4 (230 - 245 duration at .050)
Rough idle quality, mid to high PRM torque & horsepower, for serious
racing, need proper selection of rear axle and improvements in carburetion
and exhaust systems. For use with manual transmission or automatic with
a very high stall converter. Will not have enough vacuum for power accessories.