[EDFHOBBIES]

Originally Posted by JANNETTYRACING

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.

I can see this. With fuel systems there is no playing around. I have my low side and high side warnings ⚠️ on my banks. For me it easy to pull the blower and swap out a pump or injector. If I did see something screwy I guess I could have Matt turn up the port system to compensate.

I'm running a 38% on a lt4 pump and it's spaced correctly with shims per lpe instructions and Matt's mechanic measuring.