{"product_id":"merc-157","title":"Mercury MerCruiser Head Gasket 27-342731","description":"\u003cp\u003eThe \u003cstrong\u003eMercury MerCruiser Quicksilver 27-342731 Head Gasket\u003c\/strong\u003e is an OEM-style replacement head gasket for early MerCruiser inline 4-cylinder engines. It fits \u003cstrong\u003eMCM 110, MCM 120, and 2.5L MerCruiser applications from 1963–1989\u003c\/strong\u003e, helping seal the cylinder head to the engine block during top-end service.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eHead gasket for select early MerCruiser 4-cylinder engines\u003c\/li\u003e\n\u003cli\u003eFits \u003cstrong\u003eMCM 110, MCM 120, and 2.5L\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eApplication range: \u003cstrong\u003e1963–1989\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eUsed when servicing or reinstalling the cylinder head\u003c\/li\u003e\n\u003cli\u003eHelps seal combustion pressure, coolant passages, and oil passages\u003c\/li\u003e\n\u003cli\u003eSupersedes \u003cstrong\u003e27-34273\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eCurrent part number: \u003cstrong\u003e27-342731\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eEngine Compatibility\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eFits:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eMerCruiser MCM 110\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eMerCruiser MCM 120\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eMerCruiser 2.5L\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eModel years: \u003cstrong\u003e1963–1989\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eSerial Number Fitment Notice\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eFitment should still be confirmed by engine serial number and parts diagram, especially on older MerCruiser engines where prior repowers, block changes, or cylinder-head changes may affect gasket selection.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eWhen This Part Needs Replacement\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eReplace this head gasket during cylinder-head removal, head resurfacing, valve service, overheating repairs, coolant-in-cylinder diagnosis, compression loss, or any top-end repair where the original head gasket has been disturbed.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eInstallation Notes\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eInspect the cylinder head and block deck for warpage, corrosion, and surface damage before installation. Clean all mating surfaces carefully, follow the proper MerCruiser torque sequence, and use the correct service manual torque specifications for the engine.\u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eAlternate\/Superseded Part Numbers\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003e27-342731\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eSupersedes \u003cstrong\u003e27-34273\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cstrong\u003eParts Desk Insight\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eOlder MerCruiser 110\/120\/2.5L engines can have decades of service history behind them, so matching by engine family alone is not always enough. Serial-number and parts-diagram confirmation is still the safest way to make sure the head gasket matches the actual block and cylinder head on the boat.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShipping:\u003c\/strong\u003e Ships same or next day for fast Canada wide shipping. ⚓\u003c\/p\u003e","brand":"MERC","offers":[{"title":"Default Title","offer_id":43563854004260,"sku":"342731","price":166.99,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/37984e62-949a-40c7-97b6-407c2d6c42c8.png?v=1778869505","url":"https:\/\/marisolmarine.com\/products\/merc-157","provider":"Marisol Marine Company","version":"1.0","type":"link"}