Marine O-Rings - Mercury

Big Block GM H/P Long Riser Kit

This system was designed for mildly modified factory engine packages. It shares the same features as the systems listed above, except its long tailpipe discharges water later in the exhaust stream. This provides some flexibility for mild cam shaft changes. Please consult us for cam shaft compatibility. A measurement sheet must be filled out when purchasing.

Key Features:

• V-4, V-6

Interchanges/Replaces

GLM

• 86130

Johnson/Evinrude Outboard

• 321120

Mallory

• 9-76517

Key Features:

• Package of 5

Additional Details:

• I.D.: 3.000" or 76.2mm
• Width: 0.135" or 3.4mm

Interchanges/Replaces

GLM

• 82340

Mallory

• 9-76540

Mercruiser Stern Drive

• 25-20081
• 25-39572

Mercury Marine

• 25-20081
• 25-39572

Key Features:

• Package of 5

Additional Details:

• I.D.: 3.500" or 88.9mm
• Width: 0.210" or 5.3mm

Interchanges/Replaces

GLM

• 83410

Mallory

• 9-76542

Mercruiser Stern Drive

• 25-29976

Mercury Marine

• 25-29976

Key Features:

• Package of 5

Additional Details:

• I.D.: 2.635" or 67mm
• Width: 0.210" or 5.3mm

Interchanges/Replaces

GLM

• 83340

Mallory

• 9-76545

Mercruiser Stern Drive

• 25-31986

Mercury Marine

• 25-31986

Key Features:

• Package of 5

Additional Details:

• I.D.: 3.250" or 82.6mm
• Width: 0.070" or 1.8mm

Interchanges/Replaces

GLM

• 80420

Mallory

• 9-76546

Mercruiser Stern Drive

• 25-32546

Mercury Marine

• 25-32546

Key Features:

• Package of 5

Additional Details:

• I.D.: 0.620" or 15.7mm
• Width: 0.100" or 2.5mm

Interchanges/Replaces

Chrysler/Force/US Marine

• 25-45711
• 25-F455342

GLM

• 81140

Johnson/Evinrude Outboard

• 326649
• 553127

Mallory

• 9-76553

Mercruiser Stern Drive

• 25-45711

Mercury Marine

• 25-45711

Mercury Sport Jet

• 25-45711

OMC Stern Drive

• 326649
• 553127
• 910582

Key Features:

• Package of 5

Additional Details:

• I.D.: 2.675" or 67.9mm
• Width: 0.103" or 2.61mm

Interchanges/Replaces

Chrysler/Force/US Marine

• 25-69202

GLM

• 81470

Mallory

• 9-76564

Mercury Marine

• 25-69202

Sears

• 25-69202

Key Features:

• Package of 5

Additional Details:

• I.D.: 0.796" or 20.2mm
• Width: 0.139" or 3.5mm

Interchanges/Replaces

GLM

• 82110

Mallory

• 9-76565

Mercruiser Stern Drive

• 25-21836

Mercury Marine

• 25-21836

Mercury Race Outboard

• 25-21836

Mercury Race Sterndrive

• 25-21836

Mercury Sport Jet

• 25-21836

Additional Details:

• I.D.: 3.650" or 92.7mm
• Width: 0.135" or 3.4mm

Interchanges/Replaces

Mallory

• 9-76569

Mercury Marine

• 25-47254

Key Features:

• Package of 1

Additional Details:

• I.D.: 4.487" or 114mm
• Width: 0.103" or 2.6mm

Interchanges/Replaces

GLM

• 81570

Mallory

• 9-76581

Mercruiser Stern Drive

• 25-97387