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E-CNC 355 (Oval Port)
E-CNC 325 oval port heads for big-block Chevy have a 24.5° x 4.4° intake valve angle, 15.5° x 4.2° exhaust valve angle, stock exhaust port locations and spark plug angles that have been modified to produce a smooth flame front for increased fuel efficiency and maximum power. These heads are equipped with high-quality valve springs for valve lifts of up to .700°. These E-CNC heads are also treated to a full CNC porting of the combustion chambers as well as the intake and exhaust runners; this improves air-flow and overall performance potential.
Cylinder Head Specifications |
| Combustion chamber volume |
112cc |
| Intake runner volume |
308cc (lh) / 325cc (rh) |
| Exhaust runner volume |
133cc |
| Intake valve diameter |
2.25" |
| Exhaust valve diameter |
1.88" |
| Valve stem diameter |
11/32" |
| Valve guides |
Manganese Bronze |
| Deck thickness |
9/16" |
| Valve spring diameter |
1.55" |
| Valve spring maximum lift |
.700" |
| Rocker stud |
7/16" |
| Guideplate |
3/8" |
| Pushrod diameter |
3/8" |
| Valve angle |
25° |
| Exhaust port location |
+.125" |
| 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 325 with Oval Port (with springs for hydraulic flat tappet cams) |
79449* |
79459* |
| E-CNC 325 with Oval Port (with springs for hydraulic roller cams) |
79449* |
79455* |
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Flow Numbers as tested by Edelbrock's SuperFlo SF-1020 flow bench @ 28" H2O (4.31" Bore)
| #79459 |
| Valve Lift |
.200" |
.300" |
.400" |
.500" |
.600" |
.700" |
.800" |
| Intake |
143.6 (RH)
143.3 (LH) |
221.5 (RH)
222.6 (LH) |
282.8 (RH)
276.3 (LH) |
314.8 (RH)
318.3 (LH) |
332.2 (RH)
335.1 (LH) |
337.2 (RH)
337.3 (LH) |
337.7 (RH)
344.0 (LH) |
| Exhaust |
125.1 |
171.8 |
198.8 |
216.6 |
231.9 |
243.1 |
252.5 |
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Flow Numbers as tested by Edelbrock's SuperFlo SF-1020 flow bench @ 28" H2O (4.6" Bore)
| #79459 |
| Valve Lift |
.200" |
.300" |
.400" |
.500" |
.600" |
.700" |
.800" |
| Intake |
149.0 (RH)
144.6 (LH) |
230.5 (RH)
228.9 (LH) |
299.2 (RH)
289.0 (LH) |
337.1 (RH)
330.8 (LH) |
358.0 (RH)
351.4 (LH) |
364.4 (RH)
356.2 (LH) |
360.7 (RH)
363.9 (LH) |
| Exhaust |
126.1 |
172.8 |
199.7 |
217.8 |
234.4 |
248.9 |
257.5 |
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AMC
Small Block
