CYLINDER HEADS - Chevy - Small Block
NEW from Edelbrock - E-Street™ for S/B Chevy
E-Street™ cylinder heads are an all new line of Edelbrock heads designed for entry-level street performance engines, ideal for operating in the idle to 5,500 rpm range. Manufactured in the USA, by Edelbrock, these heads feature A356 aluminum castings that are heat treated to T-6 spec for superior casting strength and quality. Their modern combustion chamber designs improve the combustion process and larger than stock intake and exhaust ports move more air through your engine. These features improve an engine's efficiency, resulting in more horsepower and torque and improved mileage potential. Dyno tests showed a gain of 16 hp and 11 ft/lbs of torque over our overseas competitor.

Every E-Street is assembled with manganese bronze valve guides, powder metal interlocking valve seats, stainless steel one-piece valves with hardened tips, 1.25" diameter valve springs, 3/8" screw-in studs and guide plates. Additional qualities include hardened spring cups for long-term wear protection and Heli-coil® threaded inserts in the rocker stud bosses for increased strength; these are the details that most low-cost competitors leave out of their heads. All E-Street cylinder heads are sold in pairs and Made in the USA.

Cylinder Head Specifications

Combustion chamber volume 70cc | 64cc
Intake runner volume 185cc
Exhaust runner volume 60cc
Intake valve diameter 2.02"
Exhaust valve diameter 1.60"
Valve stem diameter 11/32"
Valve guides Manganese bronze
Deck thickness 9/16"
Valve spring diameter 1.25"
Valve spring maximum lift .550"
Rocker stud 3/8" with guide plate
Guideplate Hardended steel
Pushrod diameter 5/16"
Valve angle 23°
Exhaust port location Stock
Spark plug fitment 14mm x 3/4" reach, gasket seat
Made In USA



 

E-Street for 1986 & earlier small-block Chevy cylinder heads with straight plugs Part#
with 70cc combustion chambers (sold in pairs) 5073*
with 64cc combustion chambers (sold in pairs) 5089*

Technical Notes: Use with hydraulic camshafts .550" max lift. Recommended spark plugs are Champion RC12YC or equivalent 14mm x 3/4" reach with flat gasket seat. Requires hardened pushrods. Not legal for sale or use on pollution controlled motor vehicles.


Flow Numbers as tested by Edelbrock's SuperFlo SF-1020 flow bench @ 28" H2O
#5073, #5089
Valve Lift .100" .200" .300" .400" .500" .600" .700"
Intake 63 125 182 225 248 249 -
Exhaust 51 99 131 153 163 168 -
* Not legal for sale or use on pollution controlled motor vehicles.
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