I'm trying to understand the fuel requirements for my 383 buildup. I've read (as most have i'm sure) about the holley 502-6 670cfm w/2"tb's stock replacement so I ordered one. I believe it has 65lb injectors, will this be sufficient for 383 or should I upgrade the injectors? Do I need to change my stock in tank fuel pump or will it deliver enough up to 400-500HP? I'm doing mild changes now on my L03 while working on the 383 build, it's going to take some time so I figure it can't hurt to get more performance out of my L03 while i'm waiting. I've got right now the edelbrock tbi intake which I'm going to bore out to 2" to match the new tb unit as well as get into tuning to prepare for the motor swap (probably next years project).

Any feedback would be appreciated.

Thanks.

 

Your stock fuel pump can barely keep up with a slightly modded LO3. Your motor will require a high capacity fuel pump. I would consider a GM TPI pump and or a Walbro unit.