ITB's for LS-1/2's
"Stacks", "ITB's", "Hillborns", are common names for an engines inlet system that has ONE runner for each cylinder AND a separate butterfly for each cylinder to meter the air flow.
Most of the common American systems have two problems:
1. The throttle shaft is steel (parallel to crankshaft) and binds the "butterflies" in the aluminum bores when the engine heat changes from hot to cold.
2. The airflow at Idle/Low Angle is VERY hard to equalize AND there is NO passage way in the casting to communicate the correct vacuum signal to the EMS.
Lance
Last edited by XcYZ; 06-11-2009 at 02:08 PM.
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