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| CYLINDER HEADS - Chevy - Small Block - E-Street |
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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™ 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 |
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| Description |
Complete (Pair) |
| 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 |
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| Exhaust |
51 |
99 |
131 |
153 |
163 |
168 |
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AMC
Small Block
