What makes this Holley single plane operate in the 2000-6000 range while this Vic Jr operates in the 4500-8500 range.

I'm looking to put a lower profile single plane manifold on top of some Brodix heads for my turbo 383. I know the holley is a little taller, but it looks like the top can be milled down an inch or so and I need something that will have good street manners.

I see that the fuel rail kit for the holley is $270 whereas the fuel rails for the edelbrock is $80. But if the holley is more street able, then I might just have to suck up the $190 difference.

Is the operating range for these manifolds mostly for carb applications, kind of like how a throttle body cant be too big for efi?

 

Also what if a pyramid looking piece of solid aluminum was welded into the bottom of the plenum to reduce the volume? Would this effectively lower the operating range?

I've seen this type of thing on carbed applications to help with fuel distribution primarily as seen here.

 

thats a vic-e, not a vic JR.

The vic jr is i think 3500-7500.

Difference is length of runners and port size.

If you want streetable, go with a dual-plane setup

 

I don't know of any dual planes that are efi.

And the Vic E and the Vic Jr are the same basic size, they are just different because of the injector bungs.

 

Well, I went ahead and ordered the Holley and the fuel rails. It's a nice piece, but after some measuring it looks to be about 1" taller than my edelbrock. If I was using a stock style tb with an elbow I could mill off that 1" and everything would be good, but I'm using a carb 4150 style tb and the linkage gets in the way of the fuel rails, so I don't know what I'm going to do. I have the edelbrock gasket matched to a 1207 felpro and the new heads are going to be gasket matched to a 1206. It's fixable, but I almost want to try the holley just because the plenum is smaller and should be better matched to my needs.

 

funny, I have a vic jr-efi, and the power rating isnt that high. "3,500-7,500"
I thought the vic-e had slightly bigger ports than the vic jr-efi?

 

Its says the vic jr is 3500-8000 rpm and the vic e is 4500-8500, so the vic e has a larger/deeper plenum than the vic jr. But the vic efi, which is based off the vic e is for 4500 to 8500. There is no listing for vic jr efi.

 

hrm, I know i'm running the vic jr-efi
http://www.summitracing.com/parts/EDL-29086/

and here's the vic jr-carb
http://www.summitracing.com/parts/EDL-29087/

of course, this is for LS1 also.

 

i had a vic -e that i never ran but the ports and runners were really small

 

and the edelbrock rail kit doesnt come with a regulator or lines like the holley