These fully CNC ported 235cc heads are specifically designed for the large cubic inch strokers with 4.125" and larger bores. They are available with hydraulic roller or mechanical roller valve-train setups, and 6 bolt casting options for LSX blocks. Should you need a custom assembly not included here, give us a call!
| Standard Features |
| Material: | A356-T6 Aluminum |
| Combustion Chamber Volume: | 70cc CNC-profiled Standard |
| Intake Port Volume: | 235cc CNC Ported |
| Intake Port Location: | OEM |
| Intake Valve Diameter: | 2.080 |
| Intake Valve Seat: | Interlocking Ductile iron |
| Exhaust Port Volume: | 86cc CNC Ported |
| Exhaust Port Location: | OEM |
| Exhaust Port Dimensions: | 1.700" x 1.550" |
| Exhaust Gaskets: | Stock Gm |
| Exhaust Valve Diameter: | 1.600" |
| Exhaust Valve Seat: | Ductile iron |
| Valve Guide Material: | Bronze alloy |
| Valve Seals: | Viton® fluoroelastomer |
| Minimum Bore Diameter: | 4.030" |
| Cylinder Head Bolts: | OE Llength |
| Spark Plugs: | NGK-TR6 |
| Valve Covers: | OE bolt pattern,raised 0.200" |
| FLOW DATA 4.125" BORE |
| Lift | Intake | Exhaust | | 0.100 | 67.9 | 58.3 | | 0.200 | 146.2 | 124 | | 0.300 | 235 | 199 | | 0.400 | 293 | 244 | | 0.500 | 329 | 265 | | 0.550 | 341 | 272 | | 0.600 | 344 | 276 | |
| * Tests conducted at 28" of water, 4.125" bore, 1.875" exh. pipe |
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| FLOW DATA 4.030" BORE |
| Lift | Intake | Exhaust | | 0.100 | 67 | - | | 0.200 | 147 | - | | 0.300 | 234 | - | | 0.400 | 289 | - | | 0.500 | 324 | - | | 0.550 | 335 | - | | 0.600 | 343 | - | |
| * Tests conducted at 28" of water, 4.030" bore |
