Callies Subaru 79mm Stroke EJ Billet Crankshaft Headers a conical spring acts as

a conical spring acts as a natural harmonic damper in the transfer of valvetrain shock

Multiple Ignition Tables

50mm Exhaust

The PlugIn ECU is capable of the following features

The intake manifold will still require 19mm Spacers in order to clear AVCS solenoids if installing on AVCS heads

Callies Subaru 79mm Stroke EJ Billet Crankshaft Headers a conical spring acts asDesigned for Maximum Effort engines, all SS (Sport Series) crankshafts are finished with the same care and detail as the entire line of Compstar crankshafts. All SS cranks are sold balanced, ready for assembly. SS crankshafts by Compstar feature the best metallurgy and heat treatment on the market today. Subaru EJ20 EJ25 Standard Features: Average weight 18 lbs All rod journals drilled for lightening Material certified by Callies in house