My oil pressure in my 383 LS1 (Eagle 4" Crank, Scat 6.125" H-Beams, Mahle -6cc Pistons) has always been slightly lower than my old 5.3. I've got a FMS ported LS6 oil pump that was put on when the motor was built. I used the Blue rubber O-ring on the oil pump/pick-up tube.

The pressure is normal during cold starts. When it warms up to normal after about 5-10 minutes, it stays right at about 40psi. After riding around town it usually stays about a hair under 40psi. I've checked the oil during this and it's in the cross-hatches. I usually top it off to almost the very top of the cross-hatches and it doesn't make a difference. I'm using 10W-30 Royal Purple. When I was using Rotella T 15W-40 during break-in for the first 1000 miles, it was a little bit higher and stayed right at 40psi at idle, maybe a hair more.

Is this normal for stroked motors? Or is something wrong? Or just don't worry about it? Thanks!

 

Seems fine, I'm pretty sure that's where my LS1 sits on the guage. Talk to you engine builder, what does he say? Did he recommend what weight oil to run? It's all in how tight the engine builder makes the tolerances.