Cylinder O-Ring Seal Compatible With Mercury Mariner V6 3.0L Optimax Dfi Efi 225Hp 250Hp 300Hp

OEM PART NUMBERS:
• Mercury/Mariner: 25-878453 / 878453
• Aftermarket: 505-52

SPECIFICATIONS:
• Engine: V6 3.0L 2-Stroke (EFI, DFI, OptiMax)
• HP Range: 225HP, 250HP, 275HP, 300HP
• Bore (O-Ring size): 3.625"
• Quantity Required: 3 per cylinder head / 6 per complete engine
• Serial Range: Mid-production (0T409000-0T598999 for 225/250HP; 0T235084-0T651944 for 300X)
• Supersedes: 818573 (505-51) at S/N 0T409000
• Superseded by: 884391 (505-53) at S/N 0T599000
• Condition: New

APPLICATIONS SUMMARY:
• Mercury/Mariner V6 3.0L 2-Stroke 225-300HP — mid-serial production

PRODUCT NOTICE:
As a parts distributor we mostly sell aftermarket parts (any OEM parts would be noted as such). Aftermarket parts are not sourced from the original vehicle or equipment manufacturer, but are designed to function the same as - if not better than - the original. All parts sold are new.

WARNING - This product may expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov