Accessories - Riser Gaskets

Hardin Manifold to Riser Gasket, Replaces Mercury OEM# 27-848147

Fits: BBC, SBC and Ford manifolds as well. For Gil Replacement, Mercury HP500 and Cyclone Manifold applications.

Original quality Hardin gaskets are the finest anywhere Their graphite impregnated core assures long life. Depending on application up to 2 or 4 may be required on a single engine. When using a turbolator (See related parts) 4 are required.

Hardin Manifold to Riser Gasket for Big Gun Manifolds

Original quality Hardin gaskets are the finest anywhere Their graphite impregnated core assures long life.

Replacement riser gasket for Hardin Seaward manifolds and risers. 4-1/2" x 3" Bolt pattern.

• For Log Manifolds 
• 5" Outside Diameter 
• 3" Inside Diameter 
• 2-15/16" Bolt Hole to Bolt Hole (Adjacent)
• 4-1/8" Bolt Hole to Bolt Hole (Across)
• Sold Each
• Metal Plate

• For Log Manifolds 
• 5" Outside Diameter 
• 3" Inside Diameter 
• 2-15/16" Bolt Hole to Bolt Hole (Adjacent)
• 4-1/8" Bolt Hole to Bolt Hole (Across)
• Sold Each

Mercury 3" and 4" Restricted Flow Riser/Elbow Gasket replaces MerCruiser part # 27-860233

Exhaust Elbow Gaskets have side leakage-proof treatment and sticking proof treatment.

• Temperature Limit: 1112 F
• Thickness: 1/16 Inch
• Density of Sheet:1.309 / cm3
• Compressibility: 15-35%
• Recovery: 20% Min.
• Bolt Holes measure 3-7/16" center to center lengthwise and 3-1/16 center to center width wise. 
• Restricted water flow.

Mercury 3" and 4" Open Riser/Elbow Gasket replaces MerCruiser part # 27-863726

Exhaust Riser/Elbow Gaskets have side leakage-proof treatment and sticking proof treatment.

• Fits 1983-2002 V6 and V8, 3" or 4" riser.
• Temperature Limit: 1112 F
• Thickness: 1/16 Inch
• Density of Sheet:1.309 / cm3
• Compressibility: 15-35%
• Recovery: 20% Min.
• Bolt Holes measure 3-7/16" center to center lengthwise and 3-1/16 center to center width wise. 
• Open gasket for standard cooling riser.

Mercury 3" and 4" Blocked Flow Riser/Elbow Gasket replaces MerCruiser part # 27-860231

Exhaust Elbow Gaskets have side leakage-proof treatment and sticking proof treatment.

• Temperature Limit: 1112 F
• Thickness: 1/16 Inch
• Density of Sheet:1.309 / cm3
• Compressibility: 15-35%
• Recovery: 20% Min.
• Bolt Holes measure 3-7/16" center to center lengthwise and 3-1/16 center to center width wise. 
• Blocks water flow for Closed Cooling applications

MGK Riser GasketsMGK Riser Gasket. (Sold each)

Elbow Gasket Mercruiser 27-864547A02

Supersedes: 27-864547A1

Supercedes: 27-864547A1

GASKET-ELBOW Mercruiser 27-864850A02

Supersedes: 27-864850A1

Supercedes: 27-864850A1

Replacement Powerflow Manifold to Riser Gasket Early Style Round Hole

These are all the popular IMCO riser gaskets Don't be caught without spares This is a common wear item.

Replacement Powerflow Plus Manifold to Riser Gasket (Each)

These are all the popular IMCO riser gaskets Don't be caught without spares This is a common wear item.

Replacement Powerflow Plus Tailpipe Gaskets (Sold as Each)

These are all the popular IMCO riser gaskets Don't be caught without spares This is a common wear item.

IMCO Manifold to Riser Gaskets - Replacement Thumper Power Riser Seal

These are all the popular IMCO riser gaskets Don't be caught without spares This is a common wear item.

Exhaust Manifold To Riser Gaskets - BBC Indmar Riser Gasket (each)

Here is just a sampling of the popular exhaust manifold gaskets that weoffer.  Each gasket is designed to withstand the high temperatures ofmarine exhaust applications.  Gaskets are sold individually.

Exhaust Manifold To Riser Gaskets - BBC Indmar Riser Gasket with Slots (each)

Here is just a sampling of the popular exhaust manifold gaskets that weoffer.  Each gasket is designed to withstand the high temperatures ofmarine exhaust applications.  Gaskets are sold individually.

Exhaust Manifold To Riser Gaskets - SBC Indmar Riser Gasket with Slots (each)

Here is just a sampling of the popular exhaust manifold gaskets that we offer.  Each gasket is designed to withstand the high temperatures of marine exhaust applications.  Gaskets are sold individually.

Length: 5-5/8"
Width: 3-7/8"