posted b4 bout a 305 to 383 swap, 383 has a dead spot which is prob low fuel pressure, but im running way to rich. any suggestions on how to stop it from running rich?

 

You need tuning. That setup is completely different than what you originally had. See the stickies and search DIY-Prom board for more info.

Really the problem is that the calibration in the ECM doesnt match what the motor requires, which is why it has rich and lean spots.

 

i had a chip made for this set up

 

Made me courious, what injectors @ what pressure have you set to match your coustom chip for the 383?

 

stock 350 injectors, stock fuel pressure. it is a 383 with 305 h.o. heads, stock intake, dist. and componants

 

TBI or TPI?

I thought the 305 valves are to small for a mild 383ci and that the stock 305 heads flow really bad. https://www.thirdgen.org/forums/tbi/...-headflow.html

 

im goin to change heads to lower my compression

 

what is a good way to test fuel pump, regulator,and fuel pressure?

 

It would be easiest on the feed line right next to the alternator.

Sometimes it is good to monitor FP under load too.
With this one you can fix the gauge under the windshield wiper for some accurate testing http://www.actron.com/product_detail.php?pid=16175

Some good information https://www.thirdgen.org/forums/tbi/...sure-test.html
https://www.thirdgen.org/forums/tbi/...-pressure.html

 

got the fuel pressure up to 14lbs, did a complete tune up but still running rich and still have a dead spot. any ideas? and what controls the spray pattern of the injectors?

 

The VE tables are probably the cause, also 14 psi on the stock tune may be on the rich side, if you have the tuning equipment or the EBL flash upgrade this can be adjusted.

 

Measure the engine vacuum at different ports, it should be 17.5" or higher. If its less it'll cause the map sensor to richen it up.

 

Consider a datalog of sensor readings. Need a ALDL cable and winALDL(free program) and a laptop. A datalog will tell you what needs to be changed.
Fuel pump needs to provide adequate fuel at WOT. Stock FP?
Your chip may not be quite right for your app.