![]() ![]() ![]() Lightweight LS3 valves can be cut to fit the seats.Additional deck thickness helps head gasket sealing with power adders. Aftermarket cylinder heads offer a range runner and chamber volumes.However, be aware that piston-to-valve clearance will be reduced. ![]() This will create up to 11:1 compression on pump gas. Milling/Decking: Without modifying the intake manifold, LS1 heads can be taken to 62cc chamber volume.Porting: CNC-machined factory heads (LS1 or LS6) can flow over 320 cfm.Both respond well to custom machine work: The LS1 heads were good, but the LS6 heads were better. Drop-in dual pumps are a common upgrade.Ĭustom tuning will be required to properly adjust the fuel and ignition systems.īecause of the popularity of LS upgrades, chassis dyno tuning with the factory ECU is most common. Fuel pumps: The factory pump becomes a limitation at 450 hp.Upgrading to larger injectors is required if you’re planning more power. Fuel injectors: The standard 28-pound injectors only support about 390 hp at 90-percent duty cycle.… Upgrading the LS1 Fuel System and Tuning the Engine But, for engines turning 5,500+ rpm (minimum), or are subject to nitrous backfires, they begin to make more sense. Single-plane intakes don’t make as much torque or power as the tunnel rams. If hood clearance isn’t an issue, tunnel rams produce big gains at 6,000+ rpm.Aftermarket manifolds usually have a four-bolt flange. LS1 and LS6 throttle bodies were both 78mm and had a three-bolt mounting flange. The Corvettes came with electronic throttle control (drive-by-wire). When changing intakes, take note of the throttle body and the number of bolt holes in the mounting flange.į-body cars and the 2004 GTO were cable-operated.These are generally better for cars with stock gearing and a mild converter. Long-runner intakes make more power through the entire range. ![]() Aftermarket intakes can produce strong gains with a 90mm (LS2) throttle body. Short-runner intakes are better from 5500 rpm and up. The throttle body diameters are identical.
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December 2022
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