GM's LS engines are the hottest thing to hit the scene since Chevy debuted the first smallblock back in 1955. These fully CNC ported 245cc heads are specifically designed for the large cubic inch strokers with 4.155" and larger bores. They are available with hydraulic roller or mechancal roller valve-train setups, large nitrous exhaust ports, 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: | 245cc CNC Ported |
| Intake Port Location: | OEM |
| Intake Valve Diameter: | 2.10 |
| Intake Valve Seat: | Interlocking Ductile iron |
| Exhaust Port Volume: | 85cc 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: | 4.155" |
| Cylinder Head Bolts: | OE Llength |
| Spark Plugs: | NGK-TR6 |
| Valve Covers: | OE bolt pattern,raised 0.200" |
| FLOW DATA 4.185" BORE |
| Lift | Intake | Exhaust | | 0.100 | 69 | 56 | | 0.200 | 146 | 130 | | 0.300 | 237 | 201 | | 0.400 | 294 | 249 | | 0.500 | 336 | 269 | | 0.550 | 348 | 273 | | 0.600 | 353 | 276 | |
| * Tests conducted at 28" of water, 4.155" bore, 1.875" pipe |
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| FLOW DATA 4.185" BORE N2O EXHAUST |
| Lift | Intake | Exhaust | | 0.100 | 69 | 55 | | 0.200 | 146 | 122 | | 0.300 | 237 | 199 | | 0.400 | 294 | 250 | | 0.500 | 336 | 277 | | 0.550 | 348 | 284 | | 0.600 | 353 | 290 | |
| * Tests conducted at 28" of water, 4.155" bore, 1.875" pipe |
