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Mercruiser Exhaust Manifold Block Off Plates

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Block Off Plate - 18-1990 - Sierra
Madness Sale Price: $34.19
Part # 18-1990 ValueShip™ Eligible
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Replaces OEM part #
  • MERCURY MARINE 73813A1
Exhaust Manifold Block-Off Plate - 18-4008 - Sierra
Madness Sale Price: $8.99
Save: $3.27
(26% Off $12.26)
Part # 18-4008 ValueShip™ Eligible
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
Your Price: $9.99
Save: $1.25
(11% Off $11.24)
Part # 9-40540 ValueShip™ Eligible
Hurry! Only 1 left in stock
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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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by James from Hamptonville, North Carolina on September 24, 2011
Very nicely cut, fits bolt pattern. However, seems a smidge thinner than OE.
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