what should my fuel pressure be set at on my motor. has le2 heads, gm 847 cam, 1.6 rockers,52mm throttle body. long tube headers, and 37lbs injectors

 

anyone? i know there are a bunch of smart ppl out there help me out

 

Ideally, you'll leave it at stock fuel pressure. That's what your injectors are rated at. If you change the FP, you may have a hard time getting it tuned.

 

Stock is about 43-45 with vac line off and about 8 less with vac line on.

 

What pressure did you tell your tuner it was set at? He needed to know that to put the correct injector flow constant in the tune. If you didn't tell him anything about the fuel pressure, he would have assumed its at 43.5psi (no vacuum).