Lingenfelter CNC Ported L92/LS3 Cylinder Heads Outright No Core Charge

	Quantity in Basket:none Code: L92CNC-PAIR Price:$1,499.95 Shipping Weight: 50.00 pounds
	Valve upgrades: Manley stainless steel valves- 2.165 / 1.59 $185.00 Spring and retainer upgrades: Comp Cams 26921-KIT dual valve spring kit, titanium retainers, locks, valve seals, spring seats-$579.95 Ferrea dual valve spring kit, titanium retainers, locks, valve seals, spring seats-$1095.00   Hand polish chambers and runners to remove CNC tool tracks-$300.00 Chamber size requested - between 65 - 74 cc:
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Lingenfelter offers a CNC ported version of the L92/LS3 aluminum cylinder head used on 2008 production 6.2L based Chevrolet Corvettes and various 2007-2008 L92 L76 6.2L and 6.0L based GM trucks. The port and chambers are carefully designed to provide the best combination of high flow capabilities. This combination provides excellent horsepower gains. Lingenfelter L92/LS3 cylinder heads are precision CNC machined on our in house 5 axis CNC machine to insure that tight tolerances are maintained. The Lingenfelter CNC porting procedure is a computer controlled machining operation that duplicates details from a finished Lingenfelter hand ported cylinder head. Hand porting is a very labor intensive and time-consuming procedure that takes years to perfect. By CNC porting the cylinder heads the high cost of hand porting is reduced, plus the CNC porting is more consistent and will produce better results. Each CNC ported cylinder head will have the same port and chamber configuration as the original master used to develop the CNC program. Following porting each head receives: Precision 3 angle valve job to maximize flow & provide extended life, CC checking chamber size for correct compression, surfacing to insure deck flatness, deburring, pressure testing, professional assembly, setting spring height & checking all tolerances, and serial number. Intake runner volume - LPE CNC: 275cc - Stock GM: 261cc Exhaust runner volume - LPE CNC: 93cc - Stock GM: 89cc Base price package includes: Two New GM core cylinder heads Stock 2.165 intake valves Stock 1.59 exhaust valves Stock retainers, locks, and valve seals Comp Cams 26928 valvesprings for camshafts with up to .650 lift Minimum of 4" bore size recommended. Photos shown represent a sectioned CNC L92/LS3 cylinder head, showing the material thickness around each intake and exhaust port. These pictures do not depict hand rolled ports.     Watch Lingenfelter's 5 axis Boston CNC in action click on the link below. Lingenfelter CNC Machine Video Page     Intake valve lift (inches) .200  .300 .400 .450 .500 .550 .600 .650 .700 stock intake 156 226 276 294 310 324 332 332 308 LPE CNC intake 4.065" bore* 156 228 280 300 320 336 346 352 340 LPE CNC intake 4.125" bore* 158 230 282 302 322 340 350 358 344 Flow differences are purely from the flow fixture bore size difference. The same CNC program and the same head cylinder was tested on both bore sizes.   Exhaust valve lift (inches) .200  .300 .400 .450 .500 .550 .600 .650 .700 stock exhaust 120 158 183 190 194 199 202 204 205 LPE CNC exhaust 4.065" bore* 116 160 199 210 218 224 229 232 235 LPE CNC exhaust 4.125" bore* 116 161 201 213 220 226 231 234 237 Flow differences are purely from the flow fixture bore size difference. The same CNC program and the same head cylinder was tested on both bore sizes.