Sierra Marine Parts Catalog: Mercruiser
THERMOSTAT APPLICATION (Cont.)
Engine / Model
CID / # CYL
Year
Beginning
Ending
Housing
Thermostat
Thermostat &
Thermostat
Gaskets
Gaskets
Gaskets
Range
Serial #
Serial #
Cover
Gasket Kit
Required
Required - Design II
Required - Design III
5.0L
305/V-8
1988-1995
B774445
F600999
❷, ❾
5.0L
305/V-8
1988-1995
B774445
F600999
❸
5.0L (GeN +) FWC
305/V-8
1998-2002
L015751
M599999
18-3531 ❻
5.0L (GeN +) FWC
305/V-8
2002-2010
M600000
& Up
❻
5.0L (GeN +) ALpHA
305/V-8
1998-2002
L015751
M599999
❼
5.0L (GeN +) BrAVo
305/V-8
1998-2002
L015751
M599999
5.0L (GeN +)
305/V-8
2002-2010
M600000
& Up
❼
5.0L eFI FWC
305/V-8
1998-2001
L012052
M299999
18-3531 ❻
5.0L eFI ALpHA
305/V-8
1998-2001
L012052
M299999
❼
5.0L eFI BrAVo
305/V-8
1998-2001
L012052
M299999
5.0L MIe FWC
305/V-8
1988
B788152
C396832
❻
❼, ❽, ➀
5.0L MIe
305/V-8
1988
B788152
C396832
18-1994 ❶, ❼
5.0L MIe
305/V-8
1988
B788152
C396832
5.0L MpI FWC
305/V-8
2002
M300000
M599999
❻
5.0L MpI FWC
305/V-8
2002-2010
M600000
& Up
❻
❻, ➆
5.0L MpI FWC DTS
305/V-8
2005-2010
W310000
& Up
❻, ➅, ➇
5.0L MpI FWC eC
305/V-8
2008-2010
A300000
& Up
❻, ➆, ➇
5.0L MpI FWC eC DTS
305/V-8
2008-2010
A300000
& Up
❼, ➃
5.0L MpI
305/V-8
2002-2010
M300000
& Up
❼, ➄
5.0L MpI ALpHA
305/V-8
2002
M300000
M599999
18-3530-1 ❼, ➄
5.0L MpI BrAVo
305/V-8
2002
M300000
M599999
❼, ➄
5.0L MpI
305/V-8
2002-2010
M600000
& Up
❼, ➇
5.0L MpI eC
305/V-8
2008-2010
A300000
& Up
5.0L LX
305/V-8
1988-1995
B773740
F600999
18-1994 ❶
❷, ❽
305/V-8
1988-1995
B773740
F600999
5.0LX
5.0LX
305/V-8
1988-1995
B773740
F600999
❸
898
305/V-8
1977-1982
4762210
6218461
898
305/V-8
1983-1984
6218462
6899057
225 (GM)
327/V-8
1967-1969
2399198
2694014
225 (GM)
327/V-8
1963-1967
1539620
2399197
N.L.A.
225 (GM)
2278647
2399197
225/225S ForD
3385721
Up
250 MCM/MIe
327/V-8
1968-1969
2314301
2639854
250
350/V-8
1977
4768000
4908849
250 (GM)
4768000
4908849
250 (GM)
4175500
5907057
255 (GM)
350/V-8
1975-1976
4175500
4767999
255 (GM) MIe
350/V-8
1975-1980
4175500
5907057
255 ForD
3258728
Up
--
255 ForD MCM/MIe
3258728
4178299
--
260
350/V-8
1978-1982
4908850
6218461
260
350/V-8
1982-1987
6218462
B773304
260 MIe FWC
350/V-8
1981-1987
5907058
B788151
❻
350/V-8
1981-1987
5907058
B788151
260 MIe
❼
6218462
B525981
260 GM
♥
260 GM
4908850
6218461
260 GM IB
5907058
B522505
❼
➄
260 GM IB
5907058
B522505
❻
➅
260 MIe
5907058
0B522505
☞,❼
B522506
B525981
260/5.7L GM IB
➂➄
♠,❼
260/5.7L GM IB
B522506
B525981
➃➄
♠, ❼
260/5.7L GM IB
B522506
B525981
♣
➃➄
260/5.7L GM IB
B522506
B525981
❻
➅
260/5.7L GM
B525982
F600999
♥
☞
➂
260/5.7L GM
B525982
F600999
♠
➃
260/5.7L GM
B525982
F600999
♣
➃
260/5.7L GM
0B525982
0F600999
--
260/5.7L MIe
0B522506
0F024999
350/V-8
1969-1972
2851074
3385720
270 MCM/MIe
2851074
3077735
270 GM
280 GM
350/V-8
1975-1976
4176250
4770199
280 GM TrS
4176250
4770199
300
350/V-8
1985-1986
6668677
B430367
320 eFI
350/V-8
1987-1989
A543604
C622418
2278747
3780449
325 GM MCM/MIe
2278747
2313964
--
325 GM
325 GM
2313965
3042730
325 GM
3042731
Up
--
330 GM
4623115
Up
--
330 GM MCM/MIe
4623115
0B816540
6083145
Up
330 GM W/BW
❼
➄
330 GM W/BW
6083145
Up
❻
➅
❷, ❽
350 MAG ALpHA
350/V-8
1987-1995
B525982
F600999
350/V-8
1986-1995
A635178
B525981
350 MAG ALpHA
❶
❷, ❾
350/V-8
1987-1995
B525982
F600999
350 MAG ALpHA
350/V-8
1987-1997
B525982
K999999
350 MAG ALpHA
❸
350 MAG ALpHA eFI (GeN +)
350/V-8
1996-1997
F800300
K999999
350 MAG BrAVo MpI
350/V-8
1995-1997
F415189
K999999
350 MAG eFI SKI
350/V-8
1994-1997
F215561
K999999
350 MAG MpI FWC
350/V-8
1998-2001
L010019
M299999
18-3531 ❻
350 MAG MpI
350/V-8
1998-2001
L010019
M299999
350 MAG MpI FWC
350/V-8
2002
M300000
M599999
❻
350 MAG MpI FWC
350/V-8
2002-2010
M600000
& Up
❺
❻, ➆
350 MAG MpI FWC DTS
350/V-8
2005-2010
W310000
& Up
❻, ➅, ➇
350 MAG MpI FWC eC
350/V-8
2008-2010
A300000
& Up
❻, ➆, ➇
N/A
350 MAG MpI FWC eC DTS
350/V-8
2008-2010
A300000
& Up
350 MAG MpI
350/V-8
2002
M300000
M599999
❼, ➃
350 MAG MpI ALpHA
350/V-8
2002
M300000
M599999
❼, ➄
350 MAG MpI BrAVo
350/V-8
2002
M300000
M599999
18-3530-1 ❼, ➄
350 MAG MpI
350/V-8
2002-2010
M600000
& Up
❼, ➄
350 MAG MpI
350/V-8
2002-2010
M600000
& Up
❼, ➃
350 MAG MpI eC
350/V-8
2008-2010
A300000
& Up
❼, ➇
350 MAG MpI HorIZoN
350/V-8
2002
M300000
M599999
❻
350 MAG MpI HorIZoN
350/V-8
2002-2007
M600000
A299999
❻
350 MAG MpI HorIZoN MIe
350/V-8
1999-2001
L304700
M299999
18-3531 ❻
350 MAG MpI HorIZoN MIe
350/V-8
2002
M300000
M316999
❻
350 MAG MpI HorIZoN MIe
350/V-8
2002-2007
M317000
A089999
❻
350 MAG MpI MIe FWC
350/V-8
1998-2001
L002008
M299999
18-3531 ❻
350 MpI MIe
350/V-8
1998-2001
L002008
M299999
350 MAG MpI MIe FWC
350/V-8
2002
M300000
M316999
❻
350 MAG MpI MIe FWC
350/V-8
2002-2007
M317000
A089999
❻
Design I
❾ Without check ball
♣ 160 degree
➄ 7-point drain system
❶
Design II
❿ SN 4167000 & Up
➅ Mechanical Throttle Body
♥ For Stainless Steel version use 18-1989
❷
Design III
➀ Original thermostat housing listed as NLA.
➆ Digital Throttle Body
❸
Aluminum Exhaust Manifold
➇ Emission Control Engine
Order update kit 87290A23
❹
Cast Iron Exhaust Manifold
➈ Manual drain system
➁ Original thermostat housing listed as NLA.
❺
Closed Cooling
➉ Air Actuated drain system
Order update kit 90736A24
❻
Standard Cooling
➂ Complete thermostat housing kit kit
☞ Old Design
❼
With check ball
♠ New Design
➃ Single and 3-point drain system
637
❽