Mercruiser GM Big Block V8 (330, 340, 7.4L) Sterndrive Exhaust Manifold Exploded View
Mercruiser Sterndrive Exhaust Manifold Exploded View Diagram and Parts
Fits GM Big Block V8 454 cu. in.
Models 330, &7.4L
Fits GM Big Block V8 454 cu. in.
Models 330, &7.4L
Figure # | Description | O.E.M. # | Sierra # | Application |
---|---|---|---|---|
1 | MANIFOLD | 807078A6 | 18-1957-1 | GM Big Block (V8) 454 cu.in. Models 330, 340 & 7.4L. Use with 18-0418 manifold gasket; Mounting Kit: 18-8532 |
2 | ELBOW GASKET (BLOCKED) | 27-860231 | 18-0672 | Fits Manifold: 18-1957-1; Elbows: 18-1970-1, & 18-1976-1, 18-1974: Spacer 18-1908. |
3 | ELBOW GASKET (OPEN) | 27-818832 | 18-2849 | Fits Manifold: 18-1957-1; Elbows: 18-1970-1, & 18-1976-1, 18-1974: Spacer 18-1908. |
4 | MOUNTING STUD | N/A | NSS | Included in 18-8554 mounting kit. |
5 | MOUNTING STUD | N/A | NSS | Included in 18-8529 mounting kit. |
6 | MOUNTING BOLT | N/A | NSS | Included in 18-8505 mounting kit. |
7 | MOUNTING BOLT | N/A | NSS | Included in 18-8532 mounting kit. |
8 | MANIFOLD ELBOW | 98502A2 | 18-1974-1 | Fits Manifold: 18-1957-1. Use Elbow gaskets: 18-2849, 18-0897, or 18-0672; Use mounting kit: 18-8529 (Do not use with spacer) |
9 | MANIFOLD ELBOW | 44354A3 | 18-1976-1 | Fits Manifold: 18-1957-1. Use Elbow gaskets: 18-2849, 18-0897, or 18-0672; Use mounting kit: 18-8505, or if spacer is included use 18-8555 |
10 | MANIFOLD ELBOW | 98504A3 | 18-1970-1 | Fits Manifold: 18-1957-1. Use Elbow gaskets: 18-2849, 18-0897, or 18-0672; Use mounting kit: 18-8529, or if spacer is included use 18-8554. |
11 | HOSE FITTING | N/A | 18-8216 | 3/4" - 14NPT X 1" Hose (Corrosion Resistant Brass Fitting) |
12 | HOSE FITTING | N/A | 18-4461 | 3/4" - 14NPT X 1" Hose (Corrosion Resistant Brass Fitting) |
13 | HOSE FITTING | N/A | 18-8215 | 3/4" - 14NPT X 3/4" Hose (Corrosion Resistant Brass Fitting) |
14 | MANIFOLD SPACER KIT | 807476A6, 93320A5 | 18-1908K | 3" Riser Kit for Manifold: 18-1957-1. Includes (2) spacers, restrictor, open, & blocked gasket. All necessary mounting hardware is also included. |
15 | MOUNTING KIT | N/A | 18-8554 | Use 18-8554 Mounting Kit when 18-1908 Spacer, 18-1970-1 Elbow and 18-1974 Elbow are used together. Included in 18-1908K. Includes (1) 18-2849 & 18-0897 elbow gaskets. |
16 | MOUNTING KIT | N/A | 18-8555 | Use with Manifold Spacer: 18-1908 with Riser 18-1976-1. Included in 18-1908K. Includes (1) 18-2849 & 18-0897 elbow gaskets. |
17 | MOUNTING KIT | N/A | 18-8556 | Use with Manifold Spacer: 18-1985. Includes (1) 18-2849 & 18-0897 elbow gaskets |
18 | MOUNTING KIT | N/A | 18-8505 | Use with Riser: 18-1976-1. Includes 18-0897 elbow gasket. |
19 | MOUNTING KIT | N/A | 18-8529 | Use with Risers: 18-1970-1 & 18-1974-1. Includes 18-0897 elbow gasket. |
20 | MOUNTING KIT | N/A | 18-8532 | Use with Manifold: 18-1957-1. Includes 18-0418 manifold gasket. |
21 | MANIFOLD GASKET | 96653 / 27-46820 | 18-0418 | Use with Manifold: 18-1957-1. Included in 18-8532 mounting kit. |
22 | ELBOW GASKET (RESTRICTOR) | 27-41813 | 18-0897 | Fits Manifold: 18-1957-1; Manifold Spacers: 18-1985, & 18-1908; Elbows: 18-1970-1, & 18-1976-1, 18-1974 |
23 | MANIFOLD SPACER | 93322A12 | 18-1908 | 3" Spacer for Manifold: 18-1952-1. Use with mounting kit 18-8556. (Note: To mount elbows to spacer a separate mounting kit is needed) |
Q:
I have a 1989 merc. with 5.7 chev. 350. Looking for the manifold. What is the right one for it?
A:
We would need to cross reference OEM number so we would need an engine serial number. Contact us at the number at the top of the page with that info.
Q:
Do the mounting surfaces of the exhaust ports need to be sanded clean of paint or do they ship clean?
A:
The mounting surfaces should still seal with or without paint.
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