Manifold heat control valve.

Bill, O blocked mine off on my "dry" EFI intake manifold. Itll get plenty warm contacting the block off plate with those tubes running between the exhaust runners...fuel puddling/atomization is a non issue with port EFI.

IIRC< the bumper stop was a piece of insulation that prevented the heat valve from bouncing, making a ticking noise when you were revving it when the valve was not fully open. Probably just a ring of high temp hose would work.