{"product_id":"chevrolet-performance-vortec-cylinder-heads-12691728","title":"Chevrolet 602 Press in Studs Performance Vortec Cylinder Heads 12691728","description":"\u003cp\u003e\u003cspan\u003eChevrolet Performance cast iron Vortec cylinder heads will fit 1958 and later small block Chevy engines, and offer a 20 to 40 hp increase over earlier cast iron small block heads. Features include fast burn combustion chambers, and a high-velocity port design. They require the use of a Vortec-style intake and self-aligning rocker arms, and come complete with valves, springs, and retainers. Cylinder Head, Vortec, Assembled, Cast Iron, 64cc Chamber, 170cc Intake Runner, Chevy, Small Block, Each\u003c\/span\u003e\u003c\/p\u003e","brand":"Roger Dabbs Chevrolet","offers":[{"title":"12691728","offer_id":48342309109982,"sku":null,"price":0.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0754\/2141\/7694\/files\/nal-12691728_py_ml.jpg?v=1781726420","url":"https:\/\/harringtonspeformanceparts.com\/products\/chevrolet-performance-vortec-cylinder-heads-12691728","provider":"Harrington's Performace Parts","version":"1.0","type":"link"}