{"product_id":"manley-chevrolet-409-exhaust-valves","title":"Manley Race Series Exhaust Valves – Chevrolet 409","description":"\u003cp\u003eBuilt around the requirements of Chevrolet 409, this Race Series exhaust valve family gives engine builders a focused way to select the dimensions their cylinder-head combination calls for. The selectable configurations in this family are separated by head diameter, overall length, stem diameter, so the final SKU should be chosen from the dimensional requirements of the build.\u003c\/p\u003e\u003cp\u003eIf the Chevrolet 409 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 409\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManley Series:\u003c\/strong\u003e Race Series\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eValve Position:\u003c\/strong\u003e Exhaust\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Family Detail:\u003c\/strong\u003e Race Series application focus\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Numbers:\u003c\/strong\u003e Vary by selected configuration (2 SKUs in this parent family)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eAvailable Configurations\u003c\/h3\u003e\u003cp\u003eThis parent listing contains multiple selectable Manley SKUs. Choose the configuration that matches the measured engine or cylinder-head specification.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHead Diameter:\u003c\/strong\u003e 1.750in, 1.735in\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length:\u003c\/strong\u003e 5.105in\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStem Diameter:\u003c\/strong\u003e 0.3715in\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\u003eBefore purchase, compare the selected valve dimensions with your head manufacturer or engine builder’s specification, including stem diameter, valve length, seat diameter, and keeper arrangement.\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":"1.750in \/ 5.105in \/ 0.3715in","offer_id":50206927945978,"sku":"MAN11313-8","price":188.69,"currency_code":"USD","in_stock":true},{"title":"1.735in \/ 5.105in \/ 0.3715in","offer_id":50206927978746,"sku":"MAN11311-8","price":188.69,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0325\/6352\/7739\/files\/cfad909d3e7e99d0e89015bc460901b4L_5e0a3e42-b77f-48ae-afbd-09c4454ba270.jpg?v=1787802124","url":"https:\/\/lgcracing.com\/products\/manley-chevrolet-409-exhaust-valves","provider":"Legacy Racing","version":"1.0","type":"link"}