[QUOTE=derherr65]Randyb12: Does your 396 really hit 6000 rpm? What's the bore and stroke on those engines? The vacuum secondaries in an edelbrock should eliminate any bogging problems you could have.

Yes it does, could turn more if I had the right cam.
The Edel carb I have has a rod from the primaries that opens the secondaries directly. You can't push them shut with the primaries open. There isn't a "valve or anything to stop air from flowing through the secondaries so I am not sure what you mean about the vac secondaries on my carb.
My engine (from my website http://members.***.net/randy-barnett/):
The Engine:
Bore 4.08" Stroke 3.784" = 396cid
I got the crank, rods and pistons to convert the 360 to a 390. The block was cleand, bored, decked, new cam and lifter bearings installed. the crank and
rods were reconditioned. I got TRW forged pistons SpeedPro rings Clevite bearings. Had the rotating assembly balanced. Installed ARP rod bolts and main
studs. Assembled the short block. Put in a Edelbrock Performer RPM cam and lifters. Edelbrock timing set. Next I installed ARP head studs followed by Edelbrock
Performer RPM heads, Performer RPM intake and Performer 750cfm carb. Comp cam pushrods and Erson roller rocker assemblies. Edelbrock Elete series Air cleaner
and valve covers. Edelbrock water pump. MSD 6AL ignition control and MSD Timing Advance Computer. a Holley Phasing kit was installed in the DuraSpark Dist.
As well as MSD Cap-a-Dap HEI style Cap and rotor and MSD Super conductor 8.5mm Spark plug wires. The exhaust consists of Hedman headers with 1-3/4” primaries
and 3” collectors, 3”pipe with H-pipe just behind the trans support feeding 3” FlowMaster 40 series DeltaFlow muffs.

I should make 418Hp and 430tq.
short vid:
http://members.***.net/randy-barnett/videos/btrk.wmv

 

The edelbrock performer series carbs technically have mechanical secondaries. That's the rod you mentioned. However there is an "air valve" in the secondaries that acts as a vacuum secondary. If you look in the secondaries you can see it, and move it with your finger. I took mine out once, just to test it, and found that my mustang ran a little better with the air valve in. If you look in the secondaries and can see them opening(engine off!!!) when you push the linkage to WOT then someone has removed the air valve.

 

Well I went out and took a "look" LOL. I never noticed that before. cool. Anything that lets me keep low to mid perf and all out top end perf is a good thing. The only problem I see is that they don't seem to be adjustable.

 

Well... They are 'balanced' by weights so I suppose you could drill the weights to make them open sooner. You could drill the plates to flow more air initially and make them open later. You might be able to remove the weights and rig an adjustable spring system. Sounds like a lotta work for something already working adequately though.

 

Oh, I don't need to adjust them. I was just saying that might be an issue for some.

 

The other solution... Edelbrock thunder AVS carburetors. They have tunable vacuum secondaries. 650 and 800 cfm available. I'm going to have to get a vacuum secondary 650cfm carb for my mustang.

 

This one is Edelbrock recycling the Thermo-quad as the latest and greatest.

 

But is it any good? Seen any dyno tests on them yet?