hey ive got a 5.2L running a holley 52mm TB, and a mopar intake manifold.. what size injectors would be best to use?

 

Stick with stock size unless fuel trims are constantly positive. No sense in spending more money if it's not gonna help anything.

 

The OEM injectors are sufficient to handle all of the standard bolt-ons for the 5.2L/5.9L V8's... Even a lot of the heavy mod R/T guys are still running the OEM injectors. Without some sort of aftermarket tuning option (ie: standalone controller, SCT tune, etc.) you will typically run heavily rich at idle if you swap injectors.

 

Get an adjustable feuel pressure regulator if you choose to run aftermarket injectors.