i need help determing the size of injectors i need for me 327. I hane vortec heads with some work done to them, a custom ground cam for .500" of lift power between 2300-7200 rpm, 327 boared to a 332, gm performance intake, holley throttle body. my problem is that the holley came with 60 pd injector and i sent my computer out to get flashed but passed 5000 rpm it strugles and dies

 

I doubt the stock ECM is adequate for your goals.

The best would be EBL flash http://dynamicefi.com/ plug and play.

60#/hr injectors would require 40 psi of fuel pressure to support around 400hp.

What is the estimated hp and what injectors are available for the holley?

 

i sent my stock computer to get flashed and they said get bigger injectors but my cousin has a 383 almost same setup with the same injectors

stock style injectors interchange my goal is close to 400

i only run a 20 psi for fuel

 

I don't know how holley's injectors are rated, neither what pressure they can support.

GM 60#/hr @ 20 psi would be good for 280hp and a little more maxed out.

GM 80#/hr @ 22psi are good for 400hp and a little more maxed out.

The more experienced tuners burn many chips (20-100), to get the tune right.

 

i think i will invest into that ebl system i have sent mine out and have tested well over 20 ecm

where would i buy bigger injectors the holley injectors are rated 60pph at 12 psi

 

60pps@12psi sounds wery similar to GM 350 tbi injectors 61#/hr @13psi.

I got my pair of flow matched 80#/hr (gm#17084304) from tgo member dctrumpet.

Maybe could find some at the JY and have them flow tested and matched. http://www.witchhunter.com/tbiremoval1.php4
http://www.southbayfuelinjectors.com/

 

Some injector sizing tools,

http://www.gtsparkplugs.com/InjectorSizeCalc.html

http://www.solutions29.com/injcalc.htm