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The factory goes by millimeters...
Stock LT1 fuel pump lobe size 5.70 MM
Stock LT4 fuel pump lobe size 6.00 MM
32% Fuel Lobe 6.5 MM
38% Fuel Lobe 7.5 MM
42% Fuel Lobe 8.2 MM (LPE Big Bore Pump only)
The LPE pump is only good for a bout 10% more fuel than a LT4 with that 6.00MM lobe and for some reason that's how its advertised. When you use there GT35 or GT32 cam with the 8.2MM or You can have BTR or Comp Cams cut a 42% then the pump is 30 to 40% better.. this is one of the areas that people screw up and do not meet there fuel needs when they buy the LPE pump.
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Kong Ported 2650, Crawford Racing Port Injection, Weapon X 112mm Adapter, NW112mm TB, Livernois Ported LT4 Heads, Lingenfelter GT32 stealth cam, Haltech Elite, and Carbon by Trufiber |