400 ford flywheel on left. 460 ford flywheel hydraulic on right. spacer bushing built to center flywheel. its also been balanced to orginal 400 flywheel that was balanced with engine. needed thicker 460 flywheel to correct spline contact at clutch. gained about .180 thousandths gets me just under 1/2" spline contact and i feel safe about this now compared to .300 spline contact and also helps with the throwout bearing coming out to far and doing strange things. hopefully get assembled in the next 2 weeks. interesting learning curve!!!