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Mfr.
Barr Marine by EDM
| Mfr No. MC-20-93320A3
3" Riser Extension Blocks, MC-20-93322A3. Sold as a pair only. Includes fasteners and gaskets...
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$174.30
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Mfr.
Barr Marine by EDM
Direct Replacement Chevrolet Big Block Log Style Exhaust Manifold, MC-1-47735, MC-1-47736. Fits Mercruiser V8 Big Block Models 325, 330, 350, 370, 400 Inboard Units. Replaces Merc # 47735A1...
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$319.00
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$327.74
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Mfr.
Barr Marine by EDM
| Mfr No. MC-1-89011
Direct Replacement Mercruiser V8 GM Big Block Center Rise Exhaust Manifold, MC-1-89011. Fits Mercruiser models 330, 340 and 454 magnum. Replaces Mercruiser # 89011A8. For inboard and sterndrives...
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$320.55
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Mfr.
Barr Marine by EDM
| Mfr No. MC-20-44354
Direct Replacement Riser, MC-20-44354. Replaces Merc # 44354A3. 4" outlet...
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$165.75
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Mfr.
Barr Marine by EDM
| Mfr No. CHVA-1-84
Direct Replacement GM Big Block Exhaust Manifold GM, Center Riser Style, CHVA-1-84. Fits 427 and 454 CID GM big block V8 engines. Fits either side of engine. Mounting Kit Included...
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$215.75
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Post a question or comment about Mercruiser V8 Big Block Chevrolet Exhaust Manifolds to our online boating community.
Mercruiser 454 ci exhaust manifold - spacer of some kind needed
I’m using Comp Cams roller rocker arms with tall valve covers. When bolted up, I have no clearance between exhaust and valve cover. What can I do to solve this problem? Is there some kind of exhaust gasket spacer available? Submitted by: hotrod
You may need to fabricate your own brackets for that or check with someone specializing in performance marine products.
Do you have a 1993 7.4 King Cobra OMC # Riser 20913784 & Manifold # Volvo 3860855?
1993 7.4 King Cobra OMC # Riser 20913784 Manifold # Volvo 3860855. Answer We have a Replacement Riser available but the manifold appears to be Volvo only. Submitted by: Tony Gallino
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Thank you for your submission. Most questions and comments are typically posted with a response within 2 business days.
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Shop Sierra's Catalog for Mercruiser Marine Engine Parts 
Shop Barr's Catalog for Exhaust Systems & Parts