[red65mustang]

malc,
open spacer on a dual plane hurts idle because it exposes both primary venturi...

the carb base 3/8" pcv fitting CFM "leak" is part of the engineered carb fuel feed curve...

blocking off the pcv carb nipple enrichened the A/F mix at idle is very likely why your idle improved...
(a smaller orifice opening diameter/heavier weight piston pcv valve for less leak would have likely done the same thing)

your motor is happy=leave it as is...

"back in the day" a few oem's did use a roughly 1/2" 4 hole spacer for pcv hook up because some carb's didn't have a pcv connect...

 

[Coletrane]

Sorry OP , I should start another topic..ill try to keep it short..& thanks guys for your input

Coletrane,,,
lose the Victor Jr open plenum and mount a dual plane...

open plenum=at low rpms, the one piston that is on the intake stroke is trying to pull a vacuum from the entire huge intake cubic area in a very short time window and both carb primaries are exposed for air leakage...

dual plane=piston pulls from only half the total intake area volume and due to the divider wall under the carb the piston is pulling against only one carb primary worth of leakage...

the victor and your cam choice is a "race only" rpms operating range configuration...

carb cfm is correct (basically)

I'd agree with that, I have a dual plane Edel Perf sittin in the corner and allllmost put it on, simply to rule out a few things, BUT......as AP72 mentioned, I tried to spec this build around my application, some street driveablity(its all relative and opinionated), and parts I wanted to run. Now..im not saying I did it all rite, hence my post..=)

Keep the Vic Jr. if anything step up to the Super Vic. You need a carb swap, as already indicated by the tech's at BG.

Can you help me understand what benefits the Super Vic would provide? Ive pulled the Speed Demon, just not sure if I even want to go with BG again..carb suggestions?

Coletrane,
Airgap has the small section under the carb removed not RPM so it behaves like a dual plane and open plenum....
and more base timing (=higher Hg) will likely help low rpms carb performance,,,bump the base 4* for 36 all in and test drive

Wonder if I were to take the Edel Performer, remove half the intakes partition under the carb and run a 2" open spacer...


Thanks again.

 

[malc]

malc,
open spacer on a dual plane hurts idle because it exposes both primary venturi...

For me the four hole spacer more low end torque just did´nt work.
The motor really woke up when I went to the one inch open spacer,
and now is for me perfect on the two inch open.
It stays.

 

[sqzbox]

What do you have your initial timing set at? And have you tried taking a couple of degrees off the initial timing? Might want to re-check for vacuum leaks.

 

[red65mustang]

Coletrane,
your cam HP peak (shift point) is 5900....

the Victor Jr is a 8000 max rpms intake (overkill/to big/4000+ operating range)...

performer is only rated up to 5500,,,,the small performer intake runners (almost oem stock size) would start choking the air supply at above 3000 where your cam does really turn on and make power....
(spacer is just a tuning aid, doesn't increase runners total flow)

to be more clear,,,I should have written use a "6500+ rpms rated dual plane" (because of your cam duration) like the Weiand Stealth series/RPM/airgap RPM/etc

malc,
you didn't mention the 4 hole test is why I put that open spacer comment into the thread...
(just info for who ever reads the thread)

 

[sqzbox]

Not long ago, someone posted a link to a dyno test of 3 intakes. On all 3 they tried a spacer to see if they could improve the numbers. The best power curve with the most HP was attained with an open 1" spacer on a dual plane with the divider notched like some of the Quadrajet factory sbc intakes. Very interesting and I wish I could find the link again. I think it was off one of those cable hot rod shows.

 

[malc]

This one ?
I posted it in a similar thread(s).

 

[eric32]

Wow guys some interesting stuff posted on here. Thanks for the link. I also forgot to mention I also am not wanting to take off my spacer cause I got a proform carb to put on (my 600 holley is temporary) my intake and its the dual line hook up type with center hung float bowls and the line that I hooked up to it hits my heater core hose coming out of the intake. Nothing will clear it even the flexible type. Can't put it on unless I have the spacer on.

Am going to try to unhook the pcv and put the valve cover breather on first. Then if it still does it then I know my pcv is not the culprit. I will then proceed to put a new cap and rotor on and recheck my plug wires for any splits etc.

I know my plugs are fine cause they are a fresh new set. Good comments guys on the carb spacers and how they work or don't. I have found at least on my builds they do help a little but really enough to notice anything that much different. Just using for more spacer that's all.
Eric

 

[afsog]

1"Spacer.

I like some others, went to a 1/2 inch spacer on my Air Gap Edelbrock. NO changes, nada. Best thing to do is just enjoy and drive your car. It will eat you up worrying about this and that.

 

[sqzbox]

Yeah Malc, that's it. Thanks!