600 or 750 CFM?

[65-440]

.030 over 383, stealth heads, 9.44:1 cr ... eddy performer rpm manifold with Holley 770 no spacer ... great cold start, great hot start, great throttle response, could use a little more low end torque but doesn't take long to open right up ! ...

 

[G.V.Charger]

I'm not sure which carb shoot out you are referencing. The carb shoot out article from above is dated 2012 and manifold shoot out 2008.

Here is my cautionary note to the lovers of the RPM intake. No manifold does everything the best. And 383s are not 440s. IMO a 1 hp/cuin street driven 440, will probably be best suited with the RPM, a 1 hp/cuin 383 will probably be better suited with a Performer, or other dual plane intake IMO.

In Shoot Out 1, the 383 was making over 450 hp, and the RPM intake slightly out performed the other aluminum dual plane intakes in the upper rpm range, and about even or slightly under performing in the lower rpm range. Personally, in shoot out 1, I would pick the RPM if that was my 450 hp 383. But in reality there are very very few stock stroke 383 making anywhere near that power. That motor in SO1 had 10.3:1 CR, light weight diamond racing pistons, a medium size cam with the most aggressive racing solid flat tappet lobes made by Comp Cams. It is highly unlikely an inherited "mild" 383 will even be close to 400 hp. That, coupled with the fact the short stroke 383 struggles with low end torque, I would generally give the nod to one of the other dual plane intakes.

Yeah, I went a little large there. I was set on the DP-4B, three or four weeks of frustration, trying to secure one, they almost seem to vanish before my eye's. Then you could not find one. That is when I decided to look at the Performer, with that said, there is a very clean 74 400 block sitting in my shop. Have been waiting for the right time to build a stroker out of....And that is why I went RPM, I was planning ahead, did not think there would be a detrimental effect going a little bigger for now.

 

[BSB67]

Yeah, I went a little large there. I was set on the DP-4B, three or four weeks of frustration, trying to secure one, they almost seem to vanish before my eye's. Then you could not find one. That is when I decided to look at the Performer, with that said, there is a very clean 74 400 block sitting in my shop. Have been waiting for the right time to build a stroker out of....And that is why I went RPM, I was planning ahead, did not think there would be a detrimental effect going a little bigger for now.

 

[Bigtime]

"This is a "stoplight" car for me.....weekend fun...no racing or constant high RPM's."


Just an observation

Then why are you so stuck on a single plane intake manifold , especially on a mild build 383 ?

As others have stated - Dual Plane Intake on the street where TORQUE is it for everyday driving , stoplight to stoplight

Lower Gearing will help

But under 3,500 RPM s , a Edelbrock Performer / Performer Rpm TORQUE will bee night and day difference compared to a single plane

Especially

"This is a "stoplight" car for me.....weekend fun...no racing or constant high RPM's."

You are correct on all counts....I just bought an Edelbrock DP4B. I am going to use it with a 750 Edelbrock carb and eventually swap the 3.23 rear for a 4.11. I'll see how that works. The engine will operate [I think] in the 3500-4000 RPM range and that will make me as happy as a little green frog!