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E-Street™ 290 Oval Port for Big-Block Chevy
- 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!
Cylinder Head Specifications |
| Combustion chamber volume |
110cc |
| Intake runner volume |
290cc |
| Exhaust runner volume |
110cc |
| Intake valve diameter |
2.19" |
| Exhaust valve diameter |
1.88" |
| Valve stem diameter |
11/32" |
| Valve guides |
Maganese Bronze |
| Deck thickness |
9/16" |
| Valve spring diameter |
1.55" |
| Valve spring maximum lift |
.700" |
| Rocker stud |
7/16" with guide plate |
| Guideplate |
Hardened Steal |
| Pushrod diameter |
3/8" |
| Valve angle |
26° |
| Exhaust port location |
Stock |
| Spark plug fitment |
14mm x 3/4" reach, gasket seat |
| Made In |
USA |
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| Description |
Bare (Single) |
Complete (Single) |
| E-Street Big-Block Chevy Oval-Port (290cc) |
50449* |
50459* |
Technical Notes: Match with Edelbrock head gasket sets. Bare heads will have valve guides and seats installed, but will require final sizing and a valve job to match the valves you will be using. Recommended spark plugs are Champion RC12YC or equivalent 14mm x 3/4" reach with flat gasket seat. |
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 |
74 |
143 |
207 |
250 |
284 |
309 |
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| Exhaust |
71 |
128 |
153 |
178 |
200 |
218 |
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|
AMC
Small Block
