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E-CNC 355 For Big-Block Chevy- Rectangular Port
Edelbrock E-CNC rectangular port cylinder heads for big-block Chevy are an all new design that delivers maximum horsepower and torque in high performance street and light duty racing applications. To ensure consistency from port to port, the E-CNC heads are treated to a full CNC porting of the combustion chambers, intake and exhaust runners; this improves air-flow and overall performance potential These heads have a 24.5° x 4.4° intake valve angle, 15.5° x 4.2° exhaust valve angle, stock exhaust port locations, and the spark plug angles have been modified to produce a smooth flame front for increased fuel efficiency and maximum power. Two combustion chamber sizes are offered, 110cc and 118cc. These heads are equipped with high-quality valve springs for valve lifts of up to .700".
Cylinder Head Specifications |
| Combustion chamber volume |
110cc / 118cc |
| Intake runner volume |
348cc (lh) / 356cc (rh) - #79539
344cc (lh) / 352cc (rh) - #79559 |
| Exhaust runner volume |
145cc (#79539) / 142cc (#79559) |
| Intake valve diameter |
2.300" |
| Exhaust valve diameter |
1.88" |
| Valve stem diameter |
11/32" |
| Valve guides |
Manganese Bronze |
| Deck thickness |
5/8" |
| Valve spring diameter |
1.55" |
| Valve spring maximum lift |
.700" |
| Rocker stud |
7/16" |
| Guideplate |
3/8" |
| Pushrod diameter |
3/8" |
| Valve angle |
24.5° x 4.4° (In) / 15.5° x 4.2° (Ex) |
| Exhaust port location |
Accepts stock port location headers |
| Spark plug fitment |
14mm x 3/4 reach, gasket seat |
| Made In |
USA |
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Technical Notes: Match with Edelbrock head gasket sets. Recommended spark plugs are Champion RC12YC or equivalent 14mm x 3/4" reach with flat gasket seat. |
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| Description |
Bare (Single) |
Complete (Single) |
| E-CNC 355 with Rectangular Port (110cc) (with springs for hydraulic flat tappet cams) |
79529* |
79539* |
| E-CNC 355 with Rectangular Port (110cc) (with springs for hydraulic roller cams) |
79529* |
79535* |
| E-CNC 355 with Rectangular Port (118cc) (with springs for hydraulic flat tappet cams) |
79549* |
79559* |
| E-CNC 355 with Rectangular Port (118cc) (with springs for hydraulic roller cams) |
79549* |
79555* |
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Flow Numbers as tested by Edelbrock's SuperFlo SF-1020 flow bench @ 28" H2O
| #79539 | #79559 |
| Valve Lift |
.200" |
.300" |
.400" |
.500" |
.600" |
.700" |
.800" |
| Intake |
158.1 |
237.2 |
298.8 |
344.4 |
366.0 |
377.1 |
385.0 |
| Exhaust |
134.0 |
189.7 |
227.5 |
254.9 |
267.4 |
271.9 |
279.7 |
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AMC
Small Block
