The Edelbrock #50459 E-Street cylinder 290 Oval Port heads are designed for Big-Block applications. The Edelbrock E-Street cylinder heads offer American made quality and affordable performance. 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. The modern combustion chamber designs improve the combustion process and larger than stock intake and exhaust ports move more air through your engine for improve efficiency. For use on pre-pollution controlled vehicles only.
- Designed for entry-level street performance engines and ideal for operating in the idle to 5500 rpm
- Made from A356 aluminum castings that are heat treated to T-6 spec for superior strength and quality
- Features larger than stock intake and exhaust ports to improve engine efficiency; resulting in more horsepower, torque and improved mileage potential
- Includes hardened spring cups 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
- These heads are sold separately and Made in the USA!
Technical Notes: Recommended spark plugs are Champion RC12YC or equivalent 14mm x 3/4" reach with flat gasket seat.
Designed for use with hydraulic flat tappet camshafts. The valve and seat combination, used in these heads, is not recommended for use with a hydraulic or mechanical roller camshaft
- Cylinder Head Style:
- Assembled
- Cylinder Head Material:
- Cast aluminum
- Cylinder Head Finish:
- Natural
- CNC-Machined Combustion Chamber:
- No
- Combustion Chamber Volume (cc):
- 110
- Combustion Chamber Style:
- N/A
- CNC-Machined Intake Runner:
- No
- Intake Runner Volume (cc):
- 290cc
- Intake Port Shape:
- Oval
- Intake Port Location:
- Standard
- Intake Valve Angle:
- 26 degree
- CNC-Machined Exhaust Runner:
- No
- Exhaust Runner Volume (cc):
- 110cc
- Exhaust Port Shape:
- D-port
- Exhaust Port Location:
- Standard
- Exhaust Valve Angle:
- 26 degree
- Intake Valves Included:
- Yes
- Intake Valve Diameter (in.):
- 2.190 in.
- Exhaust Valves Included:
- Yes
- Exhaust Valve Diameter (in.):
- 1.880 in.
- Valve Type:
- Stainless
- Maximum Valve Lift (in.):
- 0.700 in.
- Valve Springs Included:
- Yes
- Valve Spring Type:
- Dual
- Outside Diameter of Outer Spring (in.):
- 1.550 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:
- Angled
- Guideplates Included:
- Yes
- Guideplate Pushrod Size:
- 3/8 in.
- Rocker Arm Studs Included:
- Yes
- Rocker Arm Nut Thread Size:
- 7/16-20 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 individually.
- Make:
- Chevrolet
- Engine Family:
- Chevy big block Mark IV
- Engine Sizes:
- 6.5L/396-7.4L/454
- Years:
- 1966-1990
- Engine Family:
- Chevy big block Gen V
- Engine Sizes:
- 7.4L/454
- Years:
- 1991-1995
