Edelbrock LD340 Intake Manifold Usable Max RPM?

Fast340cuda said
I recently took my car to a local chassis dyno and ran it with the LD340 intake. Combo is 4.06” bore, 3.58” stroke, 11.1-1 compression ratio, solid flat tappet cam (252/257 @ .050, .550 ish lift, 108 LSA). Intake was gasket matched and the plenum divider was cut down 1” and 2.5” length wise. This was topped off with a 750 double pumper. Here is the dyno graph for reference.

View attachment 1716316318

That’s a strong comparison and real world evidence, thanks for posting. To me that combo is light of where it should be with that compression and camshaft but more info on the heads would tell the tale. I definitely think something is holding that back.

Fast340cuda said
Edelbrock RPM’s that were touched up by Ray Barton.

I use the numbers as a reference. Was more interested in the power curve. I have tried the performer RPM, Weiand action plus, Victor 340 as well as the M1 single plane. I have been the happiest with the LD340 so far on my combo.

Did you dyno it with any of the other intakes? What is it about the combo with the LD340 that you happiest with?