{"product_id":"manley-chevrolet-big-block-2-300-head-diameter-5-494in-stem-severe-duty-intake-valve-kit-set-of-8","title":"Manley Severe Duty Intake Valves – Chevrolet Big Block 2.300 Head Diameter .5.494\" Stem | Set of 8","description":"\u003cp\u003eThis Manley Severe Duty intake valve family is intended for Chevrolet Big Block 2.300 Head Diameter .5.494\"; Stem builds where valve dimensions need to be matched deliberately to the cylinder head, seat work, and valvetrain geometry. The parent listing is distinguished by \u003cstrong\u003eSet of 8\u003c\/strong\u003e, which should be cross-checked against the rest of the engine combination.\u003c\/p\u003e\u003cp\u003eIf the Chevrolet Big Block 2.300 Head Diameter .5.494\"; Stem cylinder head has been ported, fitted with oversized seats, or changed from its original valvetrain layout, confirm the required valve measurements after machining rather than using a stock-size assumption.\u003c\/p\u003e\u003ch3\u003eKey Product Details\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Chevrolet Big Block 2.300 Head Diameter .5.494\"; Stem\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManley Series:\u003c\/strong\u003e Severe Duty\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValve Position:\u003c\/strong\u003e Intake\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTitle Specification:\u003c\/strong\u003e Set of 8\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Family Detail:\u003c\/strong\u003e Severe Duty application focus\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 12854-8\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003ePackage Quantity\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eSet of 8 valves.\u003c\/strong\u003e The selected configuration is supplied as a 8-piece valve package. This quantity applies to the selected Manley SKU family shown on this product page.\u003c\/p\u003e\u003ch3\u003eSelection \u0026amp; Fitment Notes\u003c\/h3\u003e\u003cp\u003eUse the finished cylinder-head setup as the authority for selection. Oversize valves or alternate lengths may require machining and can affect installed height and valvetrain geometry.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eProfessional engine assembly and measurement are recommended. Product specifications should be confirmed against the selected Manley part number and the requirements of the exact engine build.\u003c\/em\u003e\u003c\/p\u003e","brand":"Manley Performance","offers":[{"title":"Default Title","offer_id":50207042601210,"sku":"MAN12854-8","price":311.48,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0325\/6352\/7739\/files\/dc4a4b77a843aede9384abc4c1255f15L_c487fe4e-5bbf-4dc4-8f82-fd5c6b28b1ec.jpg?v=1787802359","url":"https:\/\/lgcracing.com\/products\/manley-chevrolet-big-block-2-300-head-diameter-5-494in-stem-severe-duty-intake-valve-kit-set-of-8","provider":"Legacy Racing","version":"1.0","type":"link"}