Quote:
Originally Posted by EDFHOBBIES
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 7.85 MM
42% Fuel Lobe 8.2 MM (LPE Big Bore Pump only)
43% Fuel Lobe ? mm not sure exact mm. Rynne Cunningham or Cammotions
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All to often in the aftermarket different manufacturers do not resort to a standard that is why you have to ask these questions.
If based on the LT1 5.70 mm lobe lift
32% 7.524 mm
38% 7.866 mm
42% 8.094 mm
43% 8.151 mm
There is a limit to how much you can stroke the HPFP and still see gains.
Also the higher stroke means less pump life and possible pressure control issues, so we have to be careful.
For now I choose to stick to 32% for good gains with ultimate in reliability.
At least until we see good solid reliable data that the 38% is worth the risk.
Ted.