Sierra Marine Parts Catalog

749 THERMOSTAT APPLICATION (Cont.) Engine/Model CID/#CYL YearRange Beginning Serial# EndingSerial# Housing Thermostat Cover Thermostat& GasketKit Thermostat GasketsReq. Gaskets Req.- Design II GasketsReq.- Design III 330 (WITHMERC TRANS) 454/V-8 1977-1981 4623115 6083144 18-3646 18-3551 18-2844 18-0398 330 (WITHB/W) FWC 454/V-8 1982-1987 6083145 B816540 ❻ 18-3646 18-3551 18-2553 18-0398 330 (WITHB/W) 454/V-8 1982-1987 6083145 B816540 18-3678 ❼ 18-3668 18-3551 18-2554 18-2553 18-0398 330 MIE (WITHMERC TRANS) 454/V-8 1977-1980 4623115 5889913 18-3646 18-3551 18-2844 18-0398 340 MIE FWC 454/V-8 1981-1987 5889914 B788365 ❻ 18-3646 18-3551 18-2553 18-2844 18-0398 340 MIE 454/V-8 1981-1987 5889914 B788365 18-3678 ❼ 18-3668 18-3551 18-2554 18-2844 18-0398 340 MIE 454/V-8 1981-1987 5889914 B788365 ❼ , ❾ 18-3668 18-3551 18-2554 18-2553 18-0398 340/7.4LMIE 5889914 0D715493 18-3646 18-3649 18-2553 18-2844 18-2917 350 MIE 454/V-8 1974-1976 3780450 4623109 18-3646 18-3551 18-2844 18-0398 350GM(MAGNUM) A635178 B525981 18-3668 18-3551 18-2553 18-2554 350GM(MAGNUM) ➂ B525982 UP ☞ 18-3668 18-3551 18-2553 18-2554 350GM(MAGNUM) ➃ B525982 UP ♠ 18-3668 18-3551 18-2552 18-7173 350GM(MAGNUM) ➃ B525982 UP 18-3648 ♠ 18-3648 18-3649 ♣ 18-2552 18-7173 370 454/V-8 1978-1985 4179554 6721527 18-1977-1 18-3646 18-3551 18-2553 18-2844 18-0398 370 454/V-8 1985-1987 6721528 B714586 18-3668 18-3551 18-2554 18-2553 18-0398 370TRSGM 4179554 6721527 18-3651 18-3551 18-2553 18-2844 370TRSGM 6721528 UP 18-3668 18-3551 18-2553 18-2554 390GM 2781129 2825059 18-3651 18-3551 18-2553 18-2844 390GMMCM/MIE 2781129 3042731 18-3646 18-3649 18-2553 18-2844 18-2917 400 454/V-8 1980-1986 4179554 0B457644 18-3646 18-3551 18-2553 18-2554 18-0398 400TRSGM 4179554 UP 18-3651 18-3551 18-2553 18-2844 420GM A398941 UP 18-3651 18-3651 18-3551 18-2553 18-2844 420 454/V-8 1987-1989 A398941 B622418 18-1994 18-1977-1 18-3646 18-3551 18-2553 18-2844 18-0398 425 454/V-8 1990-1993 A398941 D937011 18-3678 18-3551 18-2553 18-0398 440 454/V-8 1983-1986 4179554 B485220 18-3646 18-3551 18-2553 18-2844 18-0398 450 454/V-8 1995-1996 F347100 F347277 18-1994 18-1977-1 18-3551 18-2553 18-0398 525 SC 454/V-8 1991-1999 D456000 L415623 18-1977-1 18-3551 18-2553 18-0398 454 MAG ALPHA 454/V-8 1986-1988 A631894 B785148 18-3678 ❶ 18-3668 18-3551 18-2554 18-2553 18-0398 454 MAG ALPHA 454/V-8 1986-1988 A631894 B785148 ❷ , ❽ 18-3668 18-3551 18-7173 18-2552 18-3098 454 MAG BRAVO 454/V-8 1988-1992 B721206 D805068 18-3678 ❶ 18-3668 18-3551 18-2554 18-2553 18-0398 454 MAG BRAVO 454/V-8 1995-1997 F305000 K999999 ❷ , ❾ 18-3647 18-3649 18-0398 454 MAG BRAVO 454/V-8 1988-1992 B721206 D805068 ❷ , ❾ 18-3668 18-3551 18-7173 18-0398 454 MAG BRAVO 454/V-8 1992-1994 D805069 F304999 ❷ , ❾ 18-3668 18-3551 18-7173 18-0398 454 MAG EFI 454/V-8 1995-1997 F115700 F802349 ❼ 18-3647 18-3649 18-0398 454 MAG EFI SKI 454/V-8 1995-1997 F215800 K999999 ❼ 18-3647 18-3649 18-0398 454 MAG MPI 454/V-8 1996-2001 F802350 M024999 ❼ 18-3647 18-3649 18-0398 454 MAG MPI FWC 454/V-8 1998-2001 L010029 M024999 18-3531 ❻ 18-3568 18-3555 18-0398 454 MAG MPI HORI- ZONMIE 454/V-8 1998-2001 L002200 L674000 18-3531 ❻ 18-3568 18-3555 18-0398 454 MAG MPI SKI 454/V-8 1996-1997 F820100 K999999 ❼ 18-3647 18-3649 18-0398 525 SC 454/V-8 1991-1999 D456000 L415623 18-1977-1 18-3551 18-2553 18-0398 7.4L BRAVO 454/V-8 1995-1997 0F352000 0K999999 ❼ 18-3647 18-3649 18-0398 7.4L BRAVO 454/V-8 1988-1991 B771113 D603117 18-3678 ❶ 18-3668 18-3551 18-2554 18-2553 18-0398 7.4L BRAVO 454/V-8 1988-1991 B771113 D603117 ❷ , ❽ 18-3668 18-3551 18-7173 18-2552 18-0398 7.4L BRAVO 454/V-8 1992-1994 D603118 F351999 ❷ , ❾ 18-3668 18-3551 18-7173 18-2552 18-0398 7.4L EFI MIE 454/V-8 1996-1997 F874815 K999999 ❼ 18-3647 18-3649 18-0398 7.4L EFI MIE FWC 454/V-8 1996-1997 F874815 K999999 18-3531 ❻ 18-3568 18-3555 18-0398 7.4L MIE FWC 454/V-8 1988-1992 B788366 D715493 ❻ 18-3646 18-3551 18-2553 18-2844 18-0398 ❶ Design I ❷ Design II ❸ Design III ❹ Aluminum Exhaust Manifold ❺ Cast Iron Exhaust Manifold ❻ Closed Cooling ❼ Standard Cooling ❽ With check ball ❾ Without check ball ❿ SN 4167000 & Up ➀ Original thermostat housing listed as NLA. Order update kit 87290A23 ➁ Original thermostat housing listed as NLA. Order update kit 90736A24 ➂ Complete thermostat housing kit kit ➃ Single and 3-point drain system ➄ 7-point drain system ➅ Mechanical Throttle Body ➆ Digital Throttle Body ➇ Emission Control Engine ➈ Manual drain system ➉ Air Actuated drain system ☞ Old Design ♠ New Design ♣ 160 degree ♥ For Stainless Steel version use 18-1989 I/O — MERCRUISER - Cooling System