{"product_id":"prc-ls3-6-bolt-260cc-cnc-cylinder-heads","title":"PRC LS3 6-Bolt 260cc CNC Cylinder Heads","description":"The Texas Speed \u0026amp; Performance PRC LS3 Aftermarket 6-Bolt 260cc CNC Cylinder Heads are precision race components fully CNC-ported and machined using state-of-the-art technology, made and cast in the USA. These heads are built upon new PRC 13-degree valve angle LS3 castings that provide improved piston-to-valve clearance, enabling the use of extra compression and larger camshafts. The intake port volume is smaller than stock for enhanced port velocity, resulting in a cylinder head that moves more air than stock GM LS3 heads while maintaining better port velocity.\n\nThese 260cc runner heads are designed for LS3\/L99\/L92 stroker engines needing significant airflow, offering over 380 cfm at .700\" lift. They come standard with 2.185\" stainless steel hollow-stem intake valves and 1.60\" stainless steel exhaust valves, billet rocker pedestals, and CHE bronze guides. The 13-degree valve angle further enhances performance potential.\n\nAvailable with chamber sizes ranging from 60cc to 68cc, these cylinder heads are also offered with options for different spring kits, including TSP's .660\" and .750\" dual spring kits featuring PAC valve springs with titanium retainers. They are also available with hollow stem intake and inconel exhaust valves. The 6-bolt configuration is standard to accommodate aftermarket engine blocks with 6-bolt capabilities, such as GMPP LSx, RHS, and ERL Super Deck, and they feature a .750” thick deck surface ideal for nitrous or boosted applications.","brand":"Texas Speed \u0026 Performance","offers":[{"title":"Default Title","offer_id":52689411834168,"sku":"199-PRCLS36B260","price":2679.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0970\/4895\/3144\/files\/687722666.png?v=1784906375","url":"https:\/\/store.motormia.co\/products\/prc-ls3-6-bolt-260cc-cnc-cylinder-heads","provider":"MOTORMIA","version":"1.0","type":"link"}