E street cylinder heads feature as cast ports and are designed for entry level street performance applications operating in the idle to 5500 rpm range. When i asked edelbrock if thats because of spring pressure heres the response i received.
1968 1987 All Makes All Models Parts Edl60665 1968 87 Ford 429 460ci With Hydraulic Roller Cam Edelbrock Performer Rpm 95cc Chambercylinder Head
E street heads with roller cam. The e street 185 heads featured 185cc intake ports a 202160 valve combination and a modern 64cc combustion chamber design to maximize performance. At press time summit racings nonsale price for a pair of fully assembled e street heads for a small chevy was 94995 and the. The e street heads are not smog legal as the performer heads are. Dave said the e street head springs are compatable with hyd roller cams. Pressure needs to come up a lot faster than that for an aggressive hydro roller like the xr series. They are available for popular v8 engines.
The e street cylinder heads have never been condoned by edelbrock to change the springs for a hydraulic roller another reason is the valves in the e street heads are a little heavier than the performer valves and the valve seats are different also so its not just as easy to change the valves springs more involved then just springs. Performer power packages idle to 5500 rpm. Apparently these limits have no margin of error. Way too low a spring rate. A guy i know is thinking about going to a mild hydraulic roller cam for his chevy 350 with edelbrock e street heads but edelbrock says the heads are not suitable for use with roller cams. The limitations are the 550 lift and 5500 rpm.
E street heads are designed for high performance street applications with hydraulic flat tappet camshafts and feature larger than stock intake and exhaust ports to improve engine efficiency. The e street heads have 146 diameter springs with 120 on the seat which is in the ballpark for a street hydro roller but you have to get them to almost 580 lift before they get over 300 pressure. 918 7 the e street heads were torqued in. The seat pressure is 125 max lift pressure 325 and installed height is 175. Edelbrock e street aluminum cylinder heads offer american made quality and affordable performance. These packages use performer intake manifolds and camshafts but feature our e street cylinder heads.
Gallery of E Street Heads With Roller Cam
