Mercruiser Exhaust Manifold Block Off Plates

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GLM 51030 replacement parts

Block Off Plate - Sierra*
Sale Price: $34.19
Part # 18-1990
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Part # 18-1990
Replaces OEM part #

  • MERCURY MARINE 73813A1
Exhaust Manifold Block-Off Plate - Sierra

Exhaust Manifold Block-Off Plate - Sierra*
Sale Price: $8.09
Save: $2.40
(22% Off $10.49)
Part # 18-4008


Part # 18-4008
Replaces OEM part #

  • MERCURY MARINE 60207
Use with:
    Riser: 18-1971, 18-1978
    Manifolds: 18-1950-1, 18-1951-1, 18-1958, 18-1962
Requires (2) 18-2833 elbow gaskets
Plate, Block Off - Mallory

Plate, Block Off - Mallory
Sale Price: $8.99
Save: $1.30
(12% Off $10.29)
Part # 9-40540
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Part # 9-40540
Stainless Plate, w/weep hole
Removes air trapped in the manifold
Fits 9-40556 and 9-40558 risers
Not for fresh water/closed cooling systems

Sierra
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Average Customer Review for Exhaust Manifold Block-Off Plate - Sierra
Based On 1 Review
"New" old parts by James - Hamptonville, North CarolinaSeptember 24, 2011
Very nicely cut, fits bolt pattern. However, seems a smidge thinner than OE.
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