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.: 3.500" 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

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