Page 809 - 2021 Sierra Catalog

Item No. Description OE No. Application
1 18-1954-1 MANIFOLD 9582A5
Fits 2.5 & 3.0L 181 CID, Model 140 with Rochester carburetor w/ electrical choke (1983-89). Use with Manifold Gasket: 18-1204-1.
Fits 3.0L 181 CID, Model 140 with Rochester carburetor w/
2 18-1955-1 MANIFOLD 96705A1 mechanical choke (1968-82). Use with Manifold Gasket: 18-1204-1.
Mounting Hardware: 18-8549.
3 18-1956-3 MANIFOLD 99798A18
Fits 3.0L 181 CID, Model 140 & 3.0 with Mercarb carburetor w/ electrical choke (1983-95). Use with Manifold Gasket: 18-1204-1.
4 18-1204-1 MANIFOLD GASKET 27-96429 Fits Manifolds: 18-1954-1, 18-1955-1, 18-1956-3
5 18-2832-1 FRONT/ END CAP GASKET 27-48043-1
Fits Port & Starboard Caps of Manifolds: 18-1954-1, 18-1955-1, 18-1956-3.
6 18-4009 FRONT PLATE 60252A2 Fits Manifolds: 18-1954-1, 18-1955-1, 18-1956-3
7 18-5021 END PLATE 805629 Fits Manifolds: 18-1954-1, 18-1955-1, 18-1956-3
8 NSS MOUNTING BOLT N/A Included in 18-8512 mounting kit.
9 18-2748 EXHAUST BOOT 32-44348T 4" Inside Diameter. Use with 18-1975-1 elbow.
10 18-1971 MANIFOLD ELBOW 76351A2
Use with Manifolds: 18-1954-1, 18-1955-1, 18-1956-3; Elbow Gasket 18-2833; Mounting Kit 18-4362
11 18-1978 MANIFOLD ELBOW 76771A3
Use with Manifolds: 18-1954-1, 18-1955-1, 18-1956-3; Elbow Gasket 18-2833; Mounting Kit 18-4362
12 18-1975-1 MANIFOLD RISER 12076A2
Use with Manifolds: 18-1954-1, 18-1955-1, 18-1956-3; Elbow Gas- ket 18-2819-1; Mounting Hardware 18-8551: Exhaust Boot 18-2748.
13 NSS MOUNTING BOLT N/A Included in 18-8551 mounting hardware.
14 18-3233 MOUNTING STUD N/A 3/8-24, 3/8-16 X 1 3/4. Included in 18-4362 mounting kit.
15 NSS MOUNTING BOLT N/A Included in 18-8549 mounting kit.
16 18-4362 MOUNTING KIT N/A
Use with Elbows: 18-1971 & 18-1978. Includes 18-2833 elbow gasket
17 18-8512 MOUNTING KIT N/A
Use with Front Plate: 18-4009 & End Plate (NSS). Includes 18- 2832-1 front/end cap gasket.
18 18-8549 HARDWARE KIT N/A Includes only hardware for 18-1955-1 manifold.
19 18-8551 HARDWARE KIT N/A Includes only hardware for 18-1975-1 elbow.
20 18-2833 ELBOW GASKET 27-99777-2
Use with Elbows: 18-1971 & 18-1978. Included in 18-4362 mounting kit
21 18-2819-1 ELBOW GASKET 27-39915 Use with Elbow: 18-1973.
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I/O — MERCRUISER - Cooling System