{"product_id":"lq4-lq9-cnc-ported-317-heads-650-springs-2-02-1-59-valves-pair","title":"LQ4\/LQ9 CNC Ported 317 Heads .650 Springs 2.02\/1.59 Valves PAIR","description":"\u003cp\u003ePart#: ALL-65057PC\u003c\/p\u003e\n\u003cp\u003eManufacturer: Chevrolet\u003c\/p\u003e\n\u003cp\u003eYear Range: 97-04\u003c\/p\u003e\n\u003cp\u003eEngine Size: 6.0L - V8\u003c\/p\u003e\n\u003cp\u003eDescription: CNC Ported LQ4\/LQ9 \"317 casting\" PAIR\u003c\/p\u003e\n\u003cp\u003eIntake - 243CC\u003c\/p\u003e\n\u003cp\u003eExhaust - 95CC\u003c\/p\u003e\n\u003cp\u003eCombustion Chamber - CNC 73CC\u003c\/p\u003e\n\u003cp\u003e.650 Dual Springs, New retainers, spring seats, and valve seals.\u003c\/p\u003e\n\u003cp\u003eThese are CNC ported heads. They offer great added HP and are produced from factory GM heads. All combustion chambers are machined to create a balanced cylinder volume.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAll work is done in house on our own 5-axis Rottler CNC,\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cem\u003e\u003cstrong\u003eLooking to supercharge your LS1 or LS6 engine? Our CNC-ported 317 are a perfect match, but you may also look at our 706\/862 or 243\/799 casting as they are better adapted to N\/A and Nitrous applications.\u003c\/strong\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cem\u003e\u003cstrong\u003eHere is the 706\/862 CNC link: \u003ca href=\"https:\/\/www.alliedmotorparts.com\/collections\/performance-heads\/products\/cnc-ported-lm4-lm7-706-862-cyl-heads-650-springs-2-00-1-57-valves-pair\"\u003eCNC Ported 862\/706 Heads | LM4\/LM7 Cylinder Head Pair – Allied Motor Parts\u003c\/a\u003e\u003c\/strong\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cem\u003e\u003cstrong\u003eHere is the 243\/799 CNC link: \u003ca href=\"https:\/\/www.alliedmotorparts.com\/collections\/performance-heads\/products\/cnc-ported-ls1-ls6-243-799-heads-650-springs-2-02-1-59-valves-pair\"\u003eLS1\/LS6 CNC Ported 243 Heads \u0026amp; 799 Heads for sale – Allied Motor Parts\u003c\/a\u003e\u003c\/strong\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eEquipped with .650 Springs and 2.02\/1.59 Valves, these high-performance CNC 317 heads are meticulously crafted to surpass OEM specifications, guaranteeing top-notch quality and performance.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eIdeal for engines from 1997-2004, our ported LS heads (part number ALL-65057PC) are perfect for LS powerplants. If you're seeking improved airflow, increased power, and overall performance enhancement, our 243 ported heads are the ultimate upgrade for your LS1 or LS6 engine.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eExperience the outstanding value of our 317 heads for sale, engineered for superior airflow and precision. The CNC porting process ensures these heads are the best choice for any performance enthusiast looking to get the most out of their engine.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"ltr\"\u003e\u003cspan\u003eUpgrade today with our ported 317 heads and feel the power and performance boost in your LS6 engine. Discover the unrivaled quality and performance of our ported LS heads, the go-to choice for car enthusiasts around the globe.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003e\u003cmeta charset=\"utf-8\"\u003eExplore the comprehensive range of \u003cstrong\u003e\u003ca href=\"https:\/\/www.alliedmotorparts.com\/collections\/cylinder-heads\"\u003eCylinder head\u003c\/a\u003e \u003c\/strong\u003eoptions available in our \u003ca href=\"https:\/\/www.alliedmotorparts.com\/collections\/chevrolet-cylinder-heads\"\u003e\u003cstrong\u003eChevrolet Cylinder Heads\u003c\/strong\u003e\u003c\/a\u003e collection to ensure the perfect fit for your vehicle. Have queries? We're here to help you contact our expert support team today!\u003cbr\u003e\u003cbr\u003e\u003cmeta charset=\"utf-8\"\u003eContact our expert support team if you need help or have questions by using our \u003ca href=\"https:\/\/www.alliedmotorparts.com\/pages\/contact-us\"\u003econtact form\u003c\/a\u003e, calling \u003ca href=\"tel:866-766-9955\"\u003e866-766-9955\u003c\/a\u003e, or emailing  \u003ca href=\"mailto:sales@alliedmotorparts.com\"\u003esales@alliedmotorparts.com\u003c\/a\u003e. We're here to assist you throughout your journey. To get insights on cylinder heads, visit our \u003ca href=\"https:\/\/www.alliedmotorparts.com\/blogs\/news\"\u003eblog\u003c\/a\u003e.\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003e\u003ca href=\"https:\/\/www.alliedmotorparts.com\/blogs\/news\/chevrolet-cylinder-head-guide\"\u003e\u003cstrong\u003eLearn more about Chevrolet Cylinder Heads\u003c\/strong\u003e\u003c\/a\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThese Cylinder Heads have a core charge of $200.00 included in the cost. This charge is FULLY REFUNDED upon return. We will include a prepaid label for the return freight.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0422\/5387\/7406\/files\/LS_317_Flow_Data.jpg?v=1786040857\" alt=\"\"\u003e\u003cimg\u003e\u003cimg\u003e\u003cimg\u003e\u003cimg\u003e\u003c\/p\u003e\n\u003cp\u003eIt is also important to review\/confirm the fitment notes above to ensure the vehicle specifics of the head are correct for your application. If you have any questions that this may not be the correct head for your vehicle or need help in locating the correct head, please contact us via phone or email prior to making a purchase.\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eCheck out Our Blog related to \u003c\/span\u003e\u003ca href=\"https:\/\/www.alliedmotorparts.com\/blogs\/news\/243-heads-all-about-243-ls-heads-their-application\"\u003e\u003cspan style=\"font-weight: 400; color: #025093;\"\u003e243 Heads\u003c\/span\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-weight: 400;\"\u003eCheck out Our Blog related to \u003c\/span\u003e\u003ca href=\"https:\/\/www.alliedmotorparts.com\/blogs\/news\/799-heads-all-about-799-ls-heads-their-application\"\u003e\u003cspan style=\"font-weight: 400; color: #025093;\"\u003e799 Heads\u003c\/span\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"Chevrolet","offers":[{"title":"Default Title","offer_id":48512760971509,"sku":"ALL-65057PC","price":1495.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0422\/5387\/7406\/files\/AHP-65057PC.jpg?v=1786040833","url":"https:\/\/www.alliedmotorparts.com\/products\/lq4-lq9-cnc-ported-317-heads-650-springs-2-02-1-59-valves-pair","provider":"Allied Motor Parts","version":"1.0","type":"link"}