YODAONE
May 22, 2017
Upper intake manifold plenum.
Block off plate covers the 8 inline butterfly valve ports to direct extrude hone material through entire runner length...without plate extrude honing material would bypass low speed RPM runners and shortcut through these high RPM runners.
Original Thread
1998-2000 ls400 (2001-2006 ls430) intake manifold extrude honeMore About This Picture
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