i recently did an engine swap 305 to 350 the mechanic used the original 305 injectors to feed the 350 would those injectors be adequate and what fuel pressure will i have to adjust my regulator also my ecu has a 350 prom installed with the changeover

 

I would personally go with 24s. If you what to get the most out of your engine go with some 24 pounders

 

You will have to adjust the eprom for the smaller injectors. If you are running a 350 Prom, then it is expecting 22# injectors and right now you risk running lean.

If it is MAF, you can run with a 305 eprom as MAF is "not concerned" with displacement - so the 305 eprom will have the proper sized injectors. But with SD, the ecm must know both the displacement and injector size. In that case, you cannot just swap a 305 or 350 eprom. You must make the eprom know the displacement and injector flow.

On a positive note, most GM calibrations tend to be overly rich and adjusting fuel pressure has its greatest effect @ WOT and least effect @ part throttle. At part throttle, the O2 sensor will self correct (to a point). So just bump up the fuel pressure and it should be okay(ish). But burning an eprom is the best route.

 

thanks for info i am considering buying the 24lbs accel would i need to burn a new prom?i am running the maf system

 

Just run a 305 eprom for your MAF car and all will be fine with the stock 305 injectors.

If your run 24# injectors you will need a custom eprom for optimal performance.

 

thanks for info much appreciated ciao for now