{"product_id":"prc-ls3-as-cast-257cc-cylinder-heads-660-spring-package","title":"PRC LS3 As-Cast 257cc Cylinder Heads, .660 Spring Package","description":"\u003cp\u003eFully assembled PRC LS3 as-cast aftermarket cylinder heads with CNC-machined chambers and guides.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e257cc as-cast intake runners\u003c\/li\u003e\n\u003cli\u003e68cc chambers\u003c\/li\u003e\n\u003cli\u003e13-degree valve angle\u003c\/li\u003e\n\u003cli\u003e2.170-inch hollow-stem stainless intake valves\u003c\/li\u003e\n\u003cli\u003e1.600-inch stainless exhaust valves\u003c\/li\u003e\n\u003cli\u003eTSP .660-inch PAC dual springs with titanium retainers\u003c\/li\u003e\n\u003cli\u003eFactory rocker compatible\u003c\/li\u003e\n\u003cli\u003eExtra-thick deck surface for power-adder applications\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eFitment:\u003c\/strong\u003e LS3, L92, L99, LSA, LS9, and related Gen 4 rectangle-port engines. Verify compression, piston-to-valve clearance, pushrod length, and intake-manifold compatibility before installation.\u003c\/p\u003e","brand":"Precision Race Components","offers":[{"title":"Default","offer_id":54635381293375,"sku":"PRC-SSLS3AC","price":2399.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0760\/2041\/6831\/files\/PRC-SSLS3AC_163158b6-8619-4ca1-a045-3a71deefc839.png?v=1785151273","url":"https:\/\/smgspeed.com\/products\/prc-ls3-as-cast-257cc-cylinder-heads-660-spring-package","provider":"SMGspeed","version":"1.0","type":"link"}