E-STREET 185 - '86 & EARLIER
Edelbrock's all new line of heads are designed for entry-level street performance engines and ideal for operating in the idle to 5500 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. 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. Dyno tests showed a gain of 16 hp and 11 ft-lbs of torque over our overseas competitor..
E-Street 185 - '86 & earlier with 70cc combustion chambers (with straight plugs) 5073*
E-Street 185 - '86 & earlier with 64cc combustion chambers (with straight plugs) 5089*
Technical Notes: Use with Hydraulic Flat Tappet Camshafts .550" max lift. (NOT Compatible with Hydraulic Roller Camshafts) 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 N/A
Exhaust: 51 99 131 153 163 168 N/A
* Not legal for sale or use on pollution controlled motor vehicles.
Features
- Cylinder Head Style:
- Assembled
- Cylinder Head Material:
- Cast aluminum
- Cylinder Head Finish:
- Natural
- CNC-Machined Combustion Chamber:
- No
- Combustion Chamber Volume (cc):
- 70cc
- Combustion Chamber Style:
- Standard
- CNC-Machined Intake Runner:
- No
- Intake Runner Volume (cc):
- 185cc
- Intake Port Shape:
- Rectangular
- Intake Port Location:
- Standard
- Intake Valve Angle:
- 23 degree
- CNC-Machined Exhaust Runner:
- No
- Exhaust Runner Volume (cc):
- 60cc
- Exhaust Port Shape:
- Square
- Exhaust Port Location:
- Standard
- Exhaust Valve Angle:
- 23 degree
- Intake Valves Included:
- Yes
- Intake Valve Diameter (in.):
- 2.020 in.
- Exhaust Valves Included:
- Yes
- Exhaust Valve Diameter (in.):
- 1.600 in.
- Valve Type:
- Stainless
- Maximum Valve Lift (in.):
- 0.550 in.
- Valve Springs Included:
- Yes
- Valve Spring Type:
- Single w/Damper
- Outside Diameter of Outer Spring (in.):
- 1.460 in.
- Valve Guides Included:
- Yes
- Valve Guide Material:
- Manganese bronze
- Valve Seats Machined:
- Yes
- Valve Seat Material:
- Powdered metal
- Valve Seat Machine Style:
- 3-angle
- Retainers Included:
- Yes
- Retainer Material:
- Steel
- Valve Stem Seals Included:
- Yes
- Valve Stem Seal Style:
- PTFE Positive stop
- Locks Included:
- Yes
- Lock Style:
- 7 degree
- Camshaft Style:
- Hydraulic flat tappet
- Spark Plug Style:
- Straight
- Guideplates Included:
- Yes
- Guideplate Pushrod Size:
- 5/16 in.
- Rocker Arm Studs Included:
- Yes
- Rocker Arm Nut Thread Size:
- 3/8-24 in.
- Accessory Bolt Holes Drilled:
- Yes
- Valve Cover Mounting Style:
- Perimeter bolt
- Heat Crossover:
- No
- Steam Holes Drilled:
- No
- Oiling Style:
- Through pushrod
- Machined for O-Ring:
- No
- Quantity:
- Sold as a pair.
- Notes:
- Designed for use with hydraulic flat tappet camshafts less than .550 in. lift. Requires use of hardened pushrods. The valve and seat combination, used in these heads, is not recommended for use with a hydraulic or mechanical roller camshafts. Spark P
- Make:
- Chevrolet
- Engine Family:
- Chevy small block Gen I
- Engine Sizes:
- 4.9L/302-6.6L/400
- Years:
- 1962-1986
