{"product_id":"cast-iron-cylinder-head-for-chevy-small-block-1","title":"Cast Iron Cylinder Head for Chevy Small Block","description":"The World Products 043610-1 S\/R cylinder head is a preferred alternative to OEM or junkyard castings for Chevy Small Block engines. Constructed from high-density cast iron with extra-thick decks and walls for improved reliability, this head offers superior durability compared to stock components. It features hardened steel exhaust seats that are compatible with unleaded gasoline and integral cast iron valve guides. The valve cover rails are raised and machined to prevent oil leaks, and the head can accommodate both early-style perimeter and late-model center bolt valve covers.\n\nKey technical specifications include a 170cc intake runner volume, 65cc exhaust ports, and combustion chamber options of 67cc or 76cc. The valve job features a multi-angle intake and radius exhaust, with 2.020\" intake valves and 1.600\" exhaust valves (11\/32\" stem). The head is designed for hydraulic flat tappet lifters and includes 1.250\" springs with a maximum lift of .560\". It uses a stock 23-degree valve angle and accepts a 14mm 5\/8\" .460\" reach tapered spark plug.\n\nThis S\/R Cylinder Head is fully 50-state emissions legal and is approved for use in various racing organizations, including NHRA, United Rebel Sprint Series, and WISSOTA's Amsoil Dirt Track Series, serving as a replacement for numerous GM cylinder head part numbers. Please note that rocker arm studs are not included, and while 1.5 ratio rocker arms are standard, a 1.6 ratio may require elongation of the pushrod holes. Guide plates are not machined for them.","brand":"World Products","offers":[{"title":"Default Title","offer_id":52664138891576,"sku":"043610-1","price":499.97,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0970\/4895\/3144\/files\/687542181.jpg?v=1784333924","url":"https:\/\/store.motormia.co\/products\/cast-iron-cylinder-head-for-chevy-small-block-1","provider":"MOTORMIA","version":"1.0","type":"link"}