{"product_id":"manley-chevrolet-big-block-exhaust-valves","title":"Manley Severe Duty Exhaust Valves – Chevrolet Big Block","description":"\u003cp\u003eThis Manley Severe Duty exhaust valve family is intended for Chevrolet Big Block builds where valve dimensions need to be matched deliberately to the cylinder head, seat work, and valvetrain geometry. 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\u003eThe correct Chevrolet Big Block valve is the one that matches the finished head. Stem clearance, seat contact, installed height, spring package, and keeper location should all be checked during assembly.\u003c\/p\u003e\u003ch3\u003eKey Product Details\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Chevrolet Big Block\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 Exhaust\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 Numbers:\u003c\/strong\u003e Vary by selected configuration (29 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 1.900in, 1.880in, 1.940in, 1.850in, 1.725in, 1.600in, 1.625in, 1.720in\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOverall Length:\u003c\/strong\u003e 14 selectable values (including 5.422in, 5.522in, 5.500in, 5.374in, 5.221in, 5.454in)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStem Diameter:\u003c\/strong\u003e 0.3110in, 0.3415in, 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\u003eValve fitment should be verified from the cylinder head itself; check the required head size, stem size, overall length, seat work, and valvetrain geometry rather than relying on engine name alone.\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":"1.900in \/ 5.422in \/ 0.3110in","offer_id":50206920769786,"sku":"MAN12817-8","price":301.07,"currency_code":"USD","in_stock":true},{"title":"1.880in \/ 5.522in \/ 0.3110in","offer_id":50206920802554,"sku":"MAN12815-8","price":301.07,"currency_code":"USD","in_stock":true},{"title":"1.900in \/ 5.522in \/ 0.3110in","offer_id":50206920835322,"sku":"MAN12811-8","price":301.07,"currency_code":"USD","in_stock":true},{"title":"1.940in \/ 5.522in \/ 0.3110in","offer_id":50206920868090,"sku":"MAN12809-8","price":301.07,"currency_code":"USD","in_stock":true},{"title":"1.940in \/ 5.422in \/ 0.3110in","offer_id":50206920900858,"sku":"MAN12803-8","price":301.07,"currency_code":"USD","in_stock":true},{"title":"1.850in \/ 5.500in \/ 0.3415in","offer_id":50206920933626,"sku":"MAN12339-8","price":301.07,"currency_code":"USD","in_stock":true},{"title":"1.940in \/ 5.522in \/ 0.3715in","offer_id":50206920966394,"sku":"MAN11893-8","price":188.69,"currency_code":"USD","in_stock":true},{"title":"1.940in \/ 5.422in \/ 0.3715in","offer_id":50206920999162,"sku":"MAN11849-8","price":188.69,"currency_code":"USD","in_stock":true},{"title":"1.725in \/ 5.374in \/ 0.3715in","offer_id":50206921031930,"sku":"MAN11835-8","price":405.34,"currency_code":"USD","in_stock":true},{"title":"1.600in \/ 5.221in \/ 0.3415in","offer_id":50206921064698,"sku":"MAN11785-8","price":301.07,"currency_code":"USD","in_stock":true},{"title":"1.940in \/ 5.454in \/ 0.3715in","offer_id":50206921097466,"sku":"MAN11735-8","price":514.08,"currency_code":"USD","in_stock":true},{"title":"1.900in \/ 5.454in \/ 0.3715in","offer_id":50206921130234,"sku":"MAN11733-8","price":514.08,"currency_code":"USD","in_stock":true},{"title":"1.880in \/ 5.454in \/ 0.3715in","offer_id":50206921163002,"sku":"MAN11731-8","price":514.08,"currency_code":"USD","in_stock":true},{"title":"1.900in \/ 5.522in \/ 0.3715in","offer_id":50206921195770,"sku":"MAN11723-8","price":188.69,"currency_code":"USD","in_stock":true},{"title":"1.900in \/ 6.450in \/ 0.3415in","offer_id":50206921228538,"sku":"MAN11597-8","price":514.08,"currency_code":"USD","in_stock":true},{"title":"1.900in \/ 5.364in \/ 0.3715in","offer_id":50206921261306,"sku":"MAN11593-8","price":301.07,"currency_code":"USD","in_stock":true},{"title":"1.940in \/ 6.400in \/ 0.3415in","offer_id":50206921294074,"sku":"MAN11583-8","price":301.07,"currency_code":"USD","in_stock":true},{"title":"1.900in \/ 6.380in \/ 0.3415in","offer_id":50206921326842,"sku":"MAN11581-8","price":301.07,"currency_code":"USD","in_stock":true},{"title":"1.940in \/ 5.364in \/ 0.3715in","offer_id":50206921359610,"sku":"MAN11561-8","price":301.07,"currency_code":"USD","in_stock":true},{"title":"1.625in \/ 4.921in \/ 0.3415in","offer_id":50206921392378,"sku":"MAN11557-8","price":301.07,"currency_code":"USD","in_stock":true},{"title":"1.720in \/ 5.354in \/ 0.3715in","offer_id":50206921425146,"sku":"MAN11553-8","price":301.07,"currency_code":"USD","in_stock":true},{"title":"1.600in \/ 4.921in \/ 0.3415in","offer_id":50206921457914,"sku":"MAN11551-8","price":301.07,"currency_code":"USD","in_stock":true},{"title":"1.900in \/ 5.464in \/ 0.3715in","offer_id":50206921490682,"sku":"MAN11535-8","price":301.07,"currency_code":"USD","in_stock":true},{"title":"1.940in \/ 5.464in \/ 0.3715in","offer_id":50206921523450,"sku":"MAN11533-8","price":301.07,"currency_code":"USD","in_stock":true},{"title":"1.880in \/ 5.350in \/ 0.3715in","offer_id":50206921556218,"sku":"MAN11527-8","price":188.69,"currency_code":"USD","in_stock":true},{"title":"1.880in \/ 5.464in \/ 0.3715in","offer_id":50206921588986,"sku":"MAN11525-8","price":301.07,"currency_code":"USD","in_stock":true},{"title":"1.725in \/ 5.464in \/ 0.3715in","offer_id":50206921621754,"sku":"MAN11519-8","price":301.07,"currency_code":"USD","in_stock":true},{"title":"1.880in \/ 5.522in \/ 0.3715in","offer_id":50206921654522,"sku":"MAN11515-8","price":188.69,"currency_code":"USD","in_stock":true},{"title":"1.880in \/ 5.422in \/ 0.3715in","offer_id":50206921687290,"sku":"MAN11509-8","price":188.69,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0325\/6352\/7739\/files\/639c017773af16048d25285e221903acL_5c233c58-838d-4ef1-9108-f5ff5b643ffe.jpg?v=1787979092","url":"https:\/\/lgcracing.com\/products\/manley-chevrolet-big-block-exhaust-valves","provider":"Legacy Racing","version":"1.0","type":"link"}