{"product_id":"fed-ls-dual-spring-kit-660-lift","title":"FED LS DUAL SPRING KIT .660\" LIFT","description":"\u003cp\u003e\u003cspan class=\"html-span xdj266r x14z9mp xat24cr x1lziwak xexx8yu xyri2b x18d9i69 x1c1uobl x1hl2dhg x16tdsg8 x1vvkbs x4k7w5x x1h91t0o x1h9r5lt x1jfb8zj xv2umb2 x1beo9mf xaigb6o x12ejxvf x3igimt xarpa2k xedcshv x1lytzrv x1t2pt76 x7ja8zs x1qrby5j\"\u003e\u003cspan dir=\"auto\" class=\"x193iq5w xeuugli x13faqbe x1vvkbs x1xmvt09 x1lliihq x1s928wv xhkezso x1gmr53x x1cpjm7i x1fgarty x1943h6x xudqn12 x3x7a5m x6prxxf xvq8zen xo1l8bm xzsf02u\"\u003eThe FED Dual .660 spring kit is a great option for LS aftermarket performance engines. This spring kit works great for high-RPM, N\/A power, and boosted setups. Frankenstein and PAC Racing worked together to bring a very versatile spring that outperforms the typical polished .660 springs on the market. We offer this spring kit for stock valve guide (.505) and bronze guide (.565) applications. \u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"html-span xdj266r x14z9mp xat24cr x1lziwak xexx8yu xyri2b x18d9i69 x1c1uobl x1hl2dhg x16tdsg8 x1vvkbs x4k7w5x x1h91t0o x1h9r5lt x1jfb8zj xv2umb2 x1beo9mf xaigb6o x12ejxvf x3igimt xarpa2k xedcshv x1lytzrv x1t2pt76 x7ja8zs x1qrby5j\"\u003e\u003cspan dir=\"auto\" class=\"x193iq5w xeuugli x13faqbe x1vvkbs x1xmvt09 x1lliihq x1s928wv xhkezso x1gmr53x x1cpjm7i x1fgarty x1943h6x xudqn12 x3x7a5m x6prxxf xvq8zen xo1l8bm xzsf02u\"\u003eThese use a high-grade titanium retainer, black oxide steel locator, and 7mm GM valve locks. Our spring kit is a drop-in for stock heads and aftermarket heads.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"html-span xdj266r x14z9mp xat24cr x1lziwak xexx8yu xyri2b x18d9i69 x1c1uobl x1hl2dhg x16tdsg8 x1vvkbs x4k7w5x x1h91t0o x1h9r5lt x1jfb8zj xv2umb2 x1beo9mf xaigb6o x12ejxvf x3igimt xarpa2k xedcshv x1lytzrv x1t2pt76 x7ja8zs x1qrby5j\"\u003e\u003cspan dir=\"auto\" class=\"x193iq5w xeuugli x13faqbe x1vvkbs x1xmvt09 x1lliihq x1s928wv xhkezso x1gmr53x x1cpjm7i x1fgarty x1943h6x xudqn12 x3x7a5m x6prxxf xvq8zen xo1l8bm xzsf02u\"\u003eKit includes: \u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"html-span xdj266r x14z9mp xat24cr x1lziwak xexx8yu xyri2b x18d9i69 x1c1uobl x1hl2dhg x16tdsg8 x1vvkbs x4k7w5x x1h91t0o x1h9r5lt x1jfb8zj xv2umb2 x1beo9mf xaigb6o x12ejxvf x3igimt xarpa2k xedcshv x1lytzrv x1t2pt76 x7ja8zs x1qrby5j\"\u003e\u003cspan dir=\"auto\" class=\"x193iq5w xeuugli x13faqbe x1vvkbs x1xmvt09 x1lliihq x1s928wv xhkezso x1gmr53x x1cpjm7i x1fgarty x1943h6x xudqn12 x3x7a5m x6prxxf xvq8zen xo1l8bm xzsf02u\"\u003eFED .660 dual spring (16) \u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"html-span xdj266r x14z9mp xat24cr x1lziwak xexx8yu xyri2b x18d9i69 x1c1uobl x1hl2dhg x16tdsg8 x1vvkbs x4k7w5x x1h91t0o x1h9r5lt x1jfb8zj xv2umb2 x1beo9mf xaigb6o x12ejxvf x3igimt xarpa2k xedcshv x1lytzrv x1t2pt76 x7ja8zs x1qrby5j\"\u003e\u003cspan dir=\"auto\" class=\"x193iq5w xeuugli x13faqbe x1vvkbs x1xmvt09 x1lliihq x1s928wv xhkezso x1gmr53x x1cpjm7i x1fgarty x1943h6x xudqn12 x3x7a5m x6prxxf xvq8zen xo1l8bm xzsf02u\"\u003eGM LS locks (32) \u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"html-span xdj266r x14z9mp xat24cr x1lziwak xexx8yu xyri2b x18d9i69 x1c1uobl x1hl2dhg x16tdsg8 x1vvkbs x4k7w5x x1h91t0o x1h9r5lt x1jfb8zj xv2umb2 x1beo9mf xaigb6o x12ejxvf x3igimt xarpa2k xedcshv x1lytzrv x1t2pt76 x7ja8zs x1qrby5j\"\u003e\u003cspan dir=\"auto\" class=\"x193iq5w xeuugli x13faqbe x1vvkbs x1xmvt09 x1lliihq x1s928wv xhkezso x1gmr53x x1cpjm7i x1fgarty x1943h6x xudqn12 x3x7a5m x6prxxf xvq8zen xo1l8bm xzsf02u\"\u003eTitanium retainers (16) \u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"html-span xdj266r x14z9mp xat24cr x1lziwak xexx8yu xyri2b x18d9i69 x1c1uobl x1hl2dhg x16tdsg8 x1vvkbs x4k7w5x x1h91t0o x1h9r5lt x1jfb8zj xv2umb2 x1beo9mf xaigb6o x12ejxvf x3igimt xarpa2k xedcshv x1lytzrv x1t2pt76 x7ja8zs x1qrby5j\"\u003e\u003cspan dir=\"auto\" class=\"x193iq5w xeuugli x13faqbe x1vvkbs x1xmvt09 x1lliihq x1s928wv xhkezso x1gmr53x x1cpjm7i x1fgarty x1943h6x xudqn12 x3x7a5m x6prxxf xvq8zen xo1l8bm xzsf02u\"\u003eLocators for stock or bronze guides (16) \u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"html-span xdj266r x14z9mp xat24cr x1lziwak xexx8yu xyri2b x18d9i69 x1c1uobl x1hl2dhg x16tdsg8 x1vvkbs x4k7w5x x1h91t0o x1h9r5lt x1jfb8zj xv2umb2 x1beo9mf xaigb6o x12ejxvf x3igimt xarpa2k xedcshv x1lytzrv x1t2pt76 x7ja8zs x1qrby5j\"\u003e\u003cspan dir=\"auto\" class=\"x193iq5w xeuugli x13faqbe x1vvkbs x1xmvt09 x1lliihq x1s928wv xhkezso x1gmr53x x1cpjm7i x1fgarty x1943h6x xudqn12 x3x7a5m x6prxxf xvq8zen xo1l8bm xzsf02u\"\u003eViton High Heat Valve Seals (16)\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan class=\"html-span xdj266r x14z9mp xat24cr x1lziwak xexx8yu xyri2b x18d9i69 x1c1uobl x1hl2dhg x16tdsg8 x1vvkbs x4k7w5x x1h91t0o x1h9r5lt x1jfb8zj xv2umb2 x1beo9mf xaigb6o x12ejxvf x3igimt xarpa2k xedcshv x1lytzrv x1t2pt76 x7ja8zs x1qrby5j\"\u003e\u003cspan dir=\"auto\" class=\"x193iq5w xeuugli x13faqbe x1vvkbs x1xmvt09 x1lliihq x1s928wv xhkezso x1gmr53x x1cpjm7i x1fgarty x1943h6x xudqn12 x3x7a5m x6prxxf xvq8zen xo1l8bm xzsf02u\"\u003eSpring specs: \u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFED .660\" Lift Spring Kit\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eInstalled Height: \u003cstrong\u003e1.800\"\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSeat Pressure: \u003cstrong\u003e149 # @ 1.800\"\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eOpen Pressure: \u003cstrong\u003e396 # @ 1.140\"\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMax Recommended Lift: \u003cstrong\u003e.660\"\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCoil Bind Height: \u003cstrong\u003e1.085\"\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSpring Rate: \u003cstrong\u003e375 lbs\/in\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eO.D.: \u003cstrong\u003e1.293\"\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eOuter I.D.: \u003cstrong\u003e.948\"\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eInner I.D.: \u003cstrong\u003e.670\"\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eSpring Pressure by Valve Lift\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e.575\" Lift — \u003cstrong\u003e358 #\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e.600\" Lift — \u003cstrong\u003e370 #\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e.625\" Lift — \u003cstrong\u003e380 #\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e.650\" Lift — \u003cstrong\u003e390 #\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e.660\" Lift — \u003cstrong\u003e396 #\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Frankenstein Engine Dynamics","offers":[{"title":"OEM .505 Powder Metal Guide","offer_id":47801207947517,"sku":null,"price":450.0,"currency_code":"USD","in_stock":false},{"title":"OEM .565 Bronze Guide","offer_id":47801207980285,"sku":null,"price":450.0,"currency_code":"USD","in_stock":false},{"title":"M311 .565 Guide","offer_id":47801208013053,"sku":null,"price":450.0,"currency_code":"USD","in_stock":false},{"title":"F-Series .565 Guide","offer_id":47801208045821,"sku":null,"price":450.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0754\/7489\/5101\/files\/660.png?v=1783364632","url":"https:\/\/frankensteined.net\/products\/fed-ls-dual-spring-kit-660-lift","provider":"Frankenstein Engine Dynamics","version":"1.0","type":"link"}