OMC and Cobra Thermostats & Kits
Chart notes are listed in (red) at bottom of chart
Model	Year	Thermostat	Thermostat Kit
90	1970	18-3554	18-3653
100	1972-73	18-3554	18-3653
120	1969-80	18-3554	18-3653 (1)
120	1980-81	18-3558	18-3670 (2)
140	1973-80	18-3554	18-3653 (1)
140	1980-81	18-3558	18-3670 (2)
155	1969-72	18-3554	18-3653
165	1972-76	18-3554	18-3653
170	1974	18-3554	18-3653
175	1975-77	18-3554	18-3653
185	1978-80	18-3554	18-3653
190	1974-77	18-3554	18-3653
200	1979-81	18-3554	18-3653
210	1969-72	18-3554	18-3653
215	1971	18-3554	18-3653
225	1971	18-3554	18-3653
230	1979-81	18-3554	18-3653
235	1971	18-3554	18-3653
235	1975-77	18-3554	18-3653
240	1978	18-3554	18-3653
245	1972-75	18-3554	18-3653
250	1970-73	18-3554	18-3653
250	1979	18-3554	18-3653
260	1979-81	18-3554	18-3653
262	1989	18-3554	---
305	1977-82	18-3554	18-3653
350	1977-82	18-3554	18-3653
350	1989	18-3554	---
351	1992	18-3554	---
454	1977-82	18-3554	18-3653
460	1989	18-3554	---
2.5L	1982-88	18-3558	18-3670
3.0L	1982-88	18-3558	18-3670
3.8L	1981-85	18-3554	18-3653
4.3L	1985-86	18-3554	18-3653
4.3L	1989-92	18-3554	---
5.0L	1982-88	18-3554	18-3653
5.0L	1989-92	18-3554	---
5.7L	1982-88	18-3554	18-3653
5.7L	1989	18-3554	---
5.8L	1989-92	18-3554	---
7.5L	1988	18-3554	18-3653
(1) 1980 Models with "C" suffix only
(2) 1980 Models with "C1" suffix only