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PrevNew Swivel Water Necks for the Chevrolet LS motors. 1-1/4″, 1-1/2″ Slip fit and -16, -20 AN accepts new style thermostat with rubber seal. Spacer plate adapts new style thermostat housing to earlier LS blocks. Check out our other Swivel Necks for Small and Big blocks01 June 2015Nextby @ryan_rywire #2013 come and see it by the booth13 June 2015