The LS1 or LS6 (originally 345 cid) can be sized to a max of 427 cid using a 4. Changing to high-performance aftermarket rod bolts (such as those from ARP or A1) is recommended. 030-inch (see chart).The LS1/LS6 feature two different-length hex-head cylinder head bolts (11x100mm and 11x155mm) later LS2, LS7, LS3 and L92 engines use only 11x100mm head bolts. The newest LS3 fuel injector uses a larger diameter lower O-ring compared to all the previous injectors.The difference is 0.025 to. Max HP will be entirely based on fuel pressure, fuel used, and AF ratio ran. Max hp per injector size? Thread starter lewroe59 Start date Aug 28, 2005.Regardless, it's a really great starting point. You can chalk up most of the gains over a stock LS3's 426 horsepower and 420 pound-feet of torque to the optimized tune. ![]() You'll be first to know about Race Pages Digital latest news! Email addressThe engine made exactly 461.5 horsepower at 5,900 RPM, and 455.8 pound feet of torque at 4,800 RPM on the engine dyno. FiTech 70012 Ultimate LS EFI, LS3/L92, 500 HP, w/ Trans Control Universal Fit, Transmission Control Ships Free.
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