FLOW NUMBERS
STOCK (2.16 intake, solid stem, 1.59 exhaust, solid stem, 68cc combustion chambers; 280cc intake port, 100cc exhaust port)
L92 (Bore: 4.00 inches)
Valve lift 0 .200 0.300 0.400 0.500 0.600
In. port flow: 151 208 256 294 316
Ex. port flow: 111 152 174 183 189
GMPP CNC PORTED (2.16 intake, hollow stem; 1.59 exhaust, solid stem, 68cc combustion chambers)
L92 (Bore: 4.065 inches)
In. port flow: 150 222 260 294 332
Ex. port flow: 105 140 168 190 201
HPS Cylinder Head L92 (hand-ported, Manley stainless steel 2.165 intake, stainless steel 1.59 exhaust, solid stem, 68.5cc combustion chambers)
In. port flow: 156 230 287 323 346
Ex. port flow: 128 167 193 211 219
GMPP LS6 CNC ZO6 (2.00 intake, hollow stem, 1.55 exhaust, sodium-filled; 65cc combustion chambers; 250cc intake port, 85cc exhaust port)
(Bore: 4.160 inches)
In. port flow: 147 215 262 290 307
Ex. port flow 111 155 198 210 218
NOTE: LS3 2.16/1.599 valves, featuring hollow intake stems and sodium-filled exhaust stems are firm alternative to aftermarket parts.
Sources |
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PARTS |
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Crane Cams 144309-1 valve spring and retainer kit |
Jesel K2A-2102122 shaft rockers, 1.40-pivot, 1.80:1 ratio |
Scoggin-Dickey 90mm cable-operated throttle body L76 intake manifold Manley stainless steel 2.16/1.59 intake and exhaust valves |
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