Im trying to figure out what pressure number i need to find out what size injectors ill need the motor is a 5 over ls1 manley rods manley pistons trick flow 220 heads vrx 5 cam fast 102/102 fast billet rails stock fuel pump and lines in a 99 ta? i know koeo pressure is 55-60 psig but do i use that number to figure the injector size or another number?

 

58psi (4 bar)

That is the nominal pressure generated by your pump, and the number you should use.