{"product_id":"gjysyp-oil-valley-seal-plugs-for-gen-iv-gen-v-lsx-lt-engines-8-pc-press-fit-removable-4-8-6-2l","title":"GJYSYP Oil Valley Seal Plugs for Gen IV\/Gen V LSX LT Engines — 8‑pc Press‑Fit Removable 4.8–6.2L","description":"\u003cp\u003e\u003cstrong\u003eThese GJYSYP 8-piece oil valley seal plugs close the AFM\/DOD oil passages in genuine GM valley covers so you can convert to a conventional lifter setup without oil seepage.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eIf you’re swapping out AFM\/DOD components or converting a variable-displacement valley to a traditional lifter system on GM Gen IV and Gen V engines, leaking or open AFM oil passages are a common issue. These press-fit plugs are made to seal the oil holes in genuine DOD\/AFM valley covers on 2005–2019 Chevrolet, GM, Oldsmobile and Cadillac engines (4.8L, 5.3L, 6.0L, 6.2L displacements). They provide a neat, removable seal that prevents oil from entering the AFM tappet area once the AFM hardware is removed.\u003c\/p\u003e\n\n\u003ch3\u003eWhich engines and valley covers are these plugs compatible with?\u003c\/h3\u003e\n\n\u003cp\u003eThese plugs are specified for use with original equipment DOD\/AFM valley covers found on many 4th- and 5th-generation GM small-block engines from 2005–2019. They are not universal — fitment is limited to genuine DOD\/AFM valley covers and will not seat correctly in non-OEM or aftermarket covers.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eCompatible series: Gen IV and Gen V LSX and LT engines (L99, L83, L86, LT1, LT4, LT5).\u003c\/li\u003e\n  \u003cli\u003eTypical displacements: 4.8L, 5.3L, 6.0L, 6.2L.\u003c\/li\u003e\n  \u003cli\u003eYears: 2005–2018 for many Gen IV; 2014–2019 for 5th-generation variants.\u003c\/li\u003e\n  \u003cli\u003eOnly for genuine DOD\/AFM valley covers — not for aftermarket or non-DOD covers.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow are the plugs installed and removed?\u003c\/h3\u003e\n\n\u003cp\u003eInstallation is straightforward: each plug is gently tapped into the oil passage until it sits flush with the bottom edge of the valley cover. A 4 mm x 0.7 threaded recess in the top permits later removal with a matching bolt if you need to retrieve the plug or access the passage again.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eInstall by lightly tapping until flush with the oil hole lip.\u003c\/li\u003e\n  \u003cli\u003eTop has a 4 mm x 0.7 threaded hole for extraction using a bolt.\u003c\/li\u003e\n  \u003cli\u003eIf fit is tight, pre-freezing the plugs for one hour can help ease installation.\u003c\/li\u003e\n  \u003cli\u003eDesigned for a snug, oil-tight fit — avoid hammering excessively.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill these plugs work when converting AFM\/DOD to a conventional lifter system?\u003c\/h3\u003e\n\n\u003cp\u003eYes — they are commonly used when converting AFM\/DOD-equipped engines to a traditional valve train. By sealing the AFM oil galleries beneath the VLOM plate, the plugs prevent oil from feeding removed AFM components and help maintain normal oil routing for a conventional lifter setup.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003ePrevents oil flow into stock AFM tappets after AFM removal.\u003c\/li\u003e\n  \u003cli\u003eMaintains oil integrity for non-AFM valve train operation.\u003c\/li\u003e\n  \u003cli\u003eRemovable design supports serviceability or reversion to stock later.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAre there special precautions or installation tips I should know?\u003c\/h3\u003e\n\n\u003cp\u003eThese plugs are engineered for a tight press fit; they must be used only with genuine DOD\/AFM valley covers. Avoid forcing them into aftermarket or modified covers, and use light, controlled taps during seating. If you experience small gaps, try pre-freezing the plugs for about an hour to improve fitment.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eDo not use with non-genuine or aftermarket valley covers.\u003c\/li\u003e\n  \u003cli\u003eSeat gently and check flush alignment at the bottom edge.\u003c\/li\u003e\n  \u003cli\u003eUse the threaded top for easy removal instead of prying the plug out.\u003c\/li\u003e\n  \u003cli\u003eContact GJYSYP support for quality or warranty questions.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho this product is for: technicians, engine builders, and DIY enthusiasts who are converting GM AFM\/DOD valve trains to conventional setups or sealing OEM AFM oil passages. If you have a genuine DOD\/AFM valley cover on a Gen IV or Gen V small-block and need a reliable, removable oil passage seal, this 8-piece GJYSYP kit provides a purpose-built solution — just confirm your cover is OEM before ordering.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Do these plugs fit aftermarket valley covers?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No. They are designed only for genuine GM DOD\/AFM valley covers and will not seat correctly in aftermarket or modified covers.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I remove the plugs later if I need access?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. Each plug has a 4 mm x 0.7 threaded hole on top to extract the plug using a matching bolt.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"GJYSYP","offers":[{"title":"Default Title","offer_id":48086980624542,"sku":"B0D8V2N8N7","price":32.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/gjysyp-front-packaging-valley-plugs.jpg?v=1785911974","url":"https:\/\/northtrailauto.ca\/products\/gjysyp-oil-valley-seal-plugs-for-gen-iv-gen-v-lsx-lt-engines-8-pc-press-fit-removable-4-8-6-2l","provider":"North Trail Auto","version":"1.0","type":"link"}