Edelbrock Pro Flo 4 EFI

aeonmcallister said
Rather than start a new thread I hope I can get some help here from those who have already installed and tuned the PF4. I have mine installed and as some have said the Edelbrock forum is not overtly helpful when trying to find answers to tuning questions. Especially on Small block Mopars.

My setup.
1969 340 bored 60 over with stock type sealed power cast flat tops 4 four valve reliefs that come slightly out of the bore. stock forged bottom end
Heads are older proform speedpro for a 340 so they have the open chamber piston relief area like the Eddy performers for a 340. they are advertised at 65cc. with 1.6 roller rockers.
Cam is the following.
Make:
Chrysler
All timing components are brand new. Billet double roller timing chain with magnum tensioner, new intermediate shaft, new cam, cam bearings, rockers, lifters, valve springs and rattler balancer.

355 true trac 8 3/4 rear in a pro touring setup 67 coronet. ( I know B body) but you A body guys tend to not be as rigid when it comes to things like EFI, so there is more knowledge here than on FBBO.
Engine:
340 "LA" Mopar
RPM Range:
2000 to 6000
Camshaft Type:
Hydraulic Roller
Intake Valve Lift:
.520" rocker adjusted .554
Exhaust Valve Lift:
.515" rocker adjusted .549
Advertised Intake Duration:
282°
Advertised Exhaust Duration:
286°
Intake Duration @ .050":
229°
Exhaust Duration @ .050":
233°
Lobe Separation:
110°
Intake Centerline:
106°

Proflo4 is setup with 35lb injector and i have tried 43 and 58 psi with the same issues.

Issues:

First off with this particular cam I find it damn near impossible to set the timing at 12@ at 750 rpm which is step numero uno in the setup.(timing bounces around to much at that RPM but if I rev it to 1000 I can get it to hold the 12@ so thats where I am at on step 1. For step 2 I am at a loss I cant seem to get the IAC below 50%. I have tried removing the throttle cable, I have tried the bump it down and turn the key off in small increments but I can only seem to go so far with this method before RPM creeps up and the IAC starts going back the other way. Any tips here would be great to start?

I have been able to get the car to idle quiet nicely but its driving that I find issue with. The best tune I have worked out so far was 34 @ all in at 2800. The car would pull could until 3000 rpm than stutter until around 4k before picking back up. i have not pushed it past 4500 due to Im still breaking in the trans(883) and rear end and the new engine. Im curious with my setup what those of you that have this setup working would recommend for my setup as a starting point. Because right now its running so poorly I just dont feel comfortable driving it much and for the cost I would expect more from the so called self learning but it just seems to be making things worse.

Update: After tearing the front of the motor back down I had found that I made a boneheaded mistake using one of the adjustable billet roller timing chains. I inadvertently had the Cam retarded by 6 degrees. This resulted in no low end torque and issues with getting the timing right. After resetting to the proper center-line I put the motor back together and then ran into new issues. The cam listed above with the 1.6 rockers had to much lift and the result was that the valves would not close completely. Compression test resulted in only 120PSI per cylinder on newly built motor. Also after the change the springs were compressing to interference levels. After some review I decided I would swap to a smaller cam rather than go to a 1.5 rocker. The reason for this is the 1.6 have perfect geometry and the new 1.5 rockers I purchased were going to require a geometry correction kit. After installing LUN-20200715 Camshaft, Hydraulic Roller Tappet, Advertised Duration 264/270, Lift .485/.485, and visually setting the preload the engine sounded great but I continued to have tuning issues. New compression test #,s were within range of 200-220PSI. It was still not revving past 3k RPM with out backfiring. This was with the base 5014 tune and 17 initial and 35 all in timing. Finally last night I was able to get it running right. After seeing some of the suggestions on here I decided to back the all in timing down until it would rev past 3k. I went ahead and took it down to 31 all in at 2800 and now she pulls good. I will continue to adjust it from there to reach optimal timing but ultimately the 35 all in was just too much timing for an initial setting on my particular motor.