GM Performance Cylinder Head, LS3, CNC Ported, Each
Part Number:GMP-88958758
GM Performance Cylinder Head, LS3, CNC Ported, Each (PART #GMP-88958758)
These GM Performance Parts CNC-ported LS3 cylinder heads flow more than 350 cfm at 0.600 in. lift (intake side) at 28 in. of water restriction, or nearly 10 percent more than the stock casting. This promotes greater power across the rpm band and maximizes the advantage of additional performance parts, such as a larger camshaft and high-flow intake manifold. They feature 276cc intake runners and 92cc exhaust ports, along with a combustion chamber volume of 68cc. That's the same volume as stock LS3 cylinder heads, which maintain the stock compression ratio. The cylinder heads will fit any LS engine with cylinder bores of 4.000 in. or larger. The GM Performance Parts CNC-Ported LS3 cylinder heads are delivered fully assembled, with 2.165 in. hollow stem intake valves and 1.59 in. solid stem exhaust valves, as well as valve springs, valve locks, spring retainers, and valve stem seals.
SPECIFICATIONS |
|
| Brand | GM Performance |
| Manufacturer's Part Number | 88958758 |
| Part Type | Cylinder Heads |
| Product Line | GM Performance CNC-Ported LS3 Cylinder Heads |
| Combustion Chamber Volume (cc) | 68.5 |
| Intake Runner Volume (cc) | 276cc |
| Exhaust Runner Volume (cc) | 92cc |
| Cylinder Head Style | Assembled |
| Cylinder Head Material | Cast aluminum |
| Intake Port Shape | Rectangular |
| Intake Valve Diameter (in.) | 2.165 in. |
| CNC-Machined Combustion Chamber | No |
| CNC-Machined Intake Runner | Yes |
| CNC-Machined Exhaust Runner | Yes |
| Combustion Chamber Style | Open chamber |
| Intake Port Location | Standard |
| Exhaust Port Shape | D-port |
| Exhaust Port Location | Standard |
| Intake Valves Included | Yes |
| Exhaust Valves Included | Yes |
| Exhaust Valve Diameter (in.) | 1.590 in. |
| Valve Springs Included | Yes |
| Maximum Valve Lift (in.) | 0.550 in. |
| Damper Spring Included | No |
| Retainers Included | Yes |
| Locks Included | Yes |
| Valve Stem Seals Included | Yes |
| Rocker Arm Studs Included | No |
| Rocker Arms Included | No |
| Rocker Arm Nuts Included | No |
| Guideplates Included | No |
| Accessory Bolt Holes Drilled | Yes |
| Valve Guides Included | Yes |
| Valve Seats Machined | Yes |
| Cylinder Head Color | Natural |
| Steam Holes Drilled | No |
| Oiling Style | Through pushrod |
| Machined for O-Ring | No |
| Heat Crossover | No |
| Remanufactured | No |
| Quantity | Sold individually. |
| Notes | These cylinder heads can only be used on LS-based engines with a minimum bore diameter of 4.000 in. |
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