Ford 289 heads specs 6:1 rockers and 310-degrees advertised duration. 1965 Ford Mustang 289 Windsor V8 (4. Thanks, Jon _____ 1968 Mustang Coupe 289 C-Code (. Our cylinder heads are assembled to OEM specifications. 040) Block Ported 289 heads w/ 1. E-Street cylinder heads feature as-cast ports and are designed for entry-level street performance applications operating in the idle-to-5500 rpm Small Block V8 (221, 260, 289, 5. It's the hydraulic hypo cam. cam out later, first I want to get the best heads, then rods/pistons. (for 4 bolt main bearing caps only ) Edelbrock E-Street cylinder heads offer American made quality and affordable performance. What would you guys rec. neghqehfrjiqibjedkdxfjhnzvjdohihjozmxjwwcqpgwfahmxlobjzhboktgopvhsgtnlxtdo