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Small Block LS Engine Dyno Testing Part II - Big Power, Small Budget
The remaining crankshaft oil... The remaining crankshaft oil deflector (windage tray) nut is then tightened to 18 ft-lb. Note the screen in the pickup and the rigid cross-braced design. | Valve Sizes | Intake | Exhaust | Valve Angle | | LS2 | 2.00 | 1.55 | 15 deg | | L92/LS3 | 2.165 | 1.59 | 15 deg | | PRC L92/LS3 | 2.165 | 1.59 | 15 deg | | |
| High Performance Pontiac | | Engine Buildup Worksheet | | Engine Displacement | 418ci | | Bore/Stroke | 4.08/4.00-in | | Block/Crank Combo | GM L92/LS3, bored 0.010 / Eagle forged 4.00-in | | Bore/Stroke Ratio | 1.02: 1 | | Rod/Stroke Ratio | 1.53: 1 | | |
Since this L92/LS3 engine... Since this L92/LS3 engine was destined for a Firebird, a new F-body LS1 oil pan was employed. With a new gasket on the pan, it's placed on the bottom of the block and 14 bolts are threaded into position. The oil-pan-to-block and front-cover (front cover to be installed later) bolts are torqued to 18 ft-lb, while the oil-pan-to-rear-cover bolts are set at 106 in-lb. | Bottom End | | Block Description | ’07 + GM aluminum L92/LS3 | | Deck Height | 9.238-in | | Crank | Eagle forged LS1, 4.00-in stroke | | Balancer | Powerbond SFI-approved | | Rods | Eagle forged H-beam | | Rod Length | 6.125-in | | Bearings | ACL main and rod, Durabond cam | | Pistons | Diamond Racing forged aluminum | | Piston-to-Deck Height | +0.005-in | | Piston Pins | Diamond Racing, Trend Performance | | Method Used to Retain Piston Pins in Pistons | Double Spirolox | | Rings | Total Seal, 1.5/1.5/3.0mm, plasma-moly top, Napier second | | Preparation | Filed-to-fit, top, 0.021-in, second 0.023-in | | Rod Bolts/Head Bolts | ARP 2000 rod, ARP head | | Balancing Specs | 1,811 grams | | |
The L92/LS3 heads require... The L92/LS3 heads require a specific rocker pedestal (GM PN 12600936) due to the offset intake rocker arms (GM PN 12569167) that are used. Offset like the LS7, the L92 (1:7:1) rockers will not fit any other series of LS heads. After laying the rocker pedestal in place, a set of TSP 7.4-inch hardened 0.080 wall chromoly pushrods (PN 25-7400; retail $99.99) are slipped into position. | Oiling System | | Windage Tray | GM LS1 | | Oil Pan | GM ’98-’02 F-body | | Oil Pump | GM LS6 | | Preparation | TSP ported | | |
| Heads | | Casting Number | 199-PRCL92 | | Chamber | Open | | Head Mods | Full CNC porting, five-angle CNC valve-job, clean-up milling, PRC dual valvespring kit with titanium retainers rated to 0.660-in valve lift | | Combustion-Chamber Volume | 70cc | | Maximum Flow at 28 Inches of Pressure | 356/237 cfm at 0.650 lift | | Compression Ratio | 11.1:1 | | Valves | 2.165/1.590-in | | Angles Used in Valve Job | Proprietary, five-angle CNC | | Retainers | PRC titanium | | Keepers | Factory GM | | Valveguides | Factory GM | | Valve Seals | Viton | | Rocker Hardware | Factory GM | | Rocker Arms | Factory GM, 1.7:1 | | Pushrods | TSP chromemoly, 5/16-in | | Length | 7.40-in | | |
 The offset intake rockers...  The offset intake rockers and a new set of LS1/LS2 exhaust rockers are positioned, Teflon paste is put on the ends of the intake rocker bolts, and all of the 8mm rocker arm bolts are torqued to 24 ft-lb. Note the TSP dual-spring kit (PN 199-SPKIT; retail $289.99), which includes premium-grade springs rated to 0.660-inch lift and come complete with hardened seats, viton seals, and titanium retainers. Once the valvetrain is complete, stock LS1 valve covers are installed and the hardware is torqued to 106 in-lb. |  Although an LS1 or LS2 timing...  Although an LS1 or LS2 timing cover would bolt on, a Quick Time Performance Quick Cam two-piece timing cover is utilized in order to allow fast camshaft swaps in the dyno cell. The aircraft aluminum cover comes with a new OEM crank seal and is designed so that the crank dampener and pulley won't have to be removed in order to swap camshafts. |  Our GM L76/L92 intake manifold...  Our GM L76/L92 intake manifold assembly (GM PN 12590123; retail $595) included fuel rails, 39-lb/hr fuel injectors, and an LS2 90mm throttle body, but it has been discontinued. Although not offered as an assembly, GM recently released the LS3 intake manifold (GM PN 12602477; retail $228.95) and the throttle body, fuel rail, and injectors are all available. The manifold assembly is installed and torqued to spec. |
Pontiac Solstice Research
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