GM Cylinder Head, L92 CNC Ported, Stock Valves and Springs

Price: $699.00

Item Number: L92

Manufacturer: GM

Manufacturer Part No: 88958698

Quantity:

Casting Number 12595364 or 12582716
Valve Angle 15-degree
Combustion Chamber 70cc*
Intake Port Volume 279cc*
Exhaust port Volume 99cc*
Minimum Cylinder Bore 4.000”
* Approximate, Numbers are within +/- 2cc’s

Milling Information for Combustion Chamber Sizing:
- Approximately 0.006” per 1-cc
For 68-cc Chamber Remove 0.012”
For 65-cc Chamber Remove 0.030”

Specifications:
Springs: Stock LS1, 12589774
Max Lift: 0.500"
Locks: Stock
Retainers: Stock
Valves: Stock

Flow Chart:
Flowed @ 28” H20 on a 4.155” Bore

Lift	0.100	0.200	0.300	0.400	0.500	0.600	0.700
Intake	69	154	222	266	309	345	358
Exhaust	46	100	136	166	189	202	209