{"product_id":"edelbrock-cyl-head-perf-rpm-amc-290-304-343-360-390-401-v-8-w-mach-exhst-x-over-complete","title":"Edelbrock Cyl Head Perf RPM AMC 290 304 343 360 390 401 V-8 w\/ Mach Exhst X-Over Complete","description":"\u003cp\u003eThe Edelbrock #60139 Performer RPM cylinder head is designed as a bolt-on performance upgrade for any 1967-91 AMX, Javelin or Jeep with a 343, 360, 390 or 401 AMC V8 engine. They include adjustable rocker studs and guide plates set-up for use with small-block Ford style adjustable 1.6:1 ratio rockers. The intake flange is dual-drilled to accommodate early and late model intake bolt patterns, covering 1967-91. A Complete head includes larger than- stock valve springs to handle most high-lift cams. They feature stock location ports for compatibility with standard manifolds and headers. A direct bolt-on for 1970 and later engines with 1\/2\" head bolts, This head includes step-dowel pins for pre-1970 engines. Their dual-quench combustion chambers produce approximately 9.5:1 compression in 401 V8 engines. The 45deg intake seat angle offers improved mid- to high-lift flow over the stock 30deg angle. The Edelbrock #601139 Performer RPM cylinder head has a machined heat crossover for 50-state emissions legal performance.\u003c\/p\u003e\u003ca href=\"https:\/\/d32vzsop7y1h3k.cloudfront.net\/a94f98a6cca627bead20d256b78521ca.PDF\"\u003eWarranty\u003c\/a\u003e\u003cbr\u003e\u003ca href=\"https:\/\/d32vzsop7y1h3k.cloudfront.net\/7c8aa45f41fbe0e20c77a919e37a628b.PDF\"\u003eInstallation Instructions\u003c\/a\u003e\u003cbr\u003e","brand":"Edelbrock","offers":[{"title":"Default Title","offer_id":42839441277033,"sku":"EDE60139","price":1414.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0567\/3949\/6041\/files\/07710fdd80c8e88e4e22186aa1c6c1ac.jpg?v=1769104000","url":"https:\/\/velocityfactor.shop\/products\/edelbrock-cyl-head-perf-rpm-amc-290-304-343-360-390-401-v-8-w-mach-exhst-x-over-complete","provider":"Velocity Factor","version":"1.0","type":"link"}