4 Hole Carb Spacer on Vic Jr. on 408W Stroker

armand67Fstback · Oct 23, 2011

My hunch is that my single plane 351W Vic Jr. Intake is too high RPM for a 60% street driven vehicle with 3.89 gears. The other 40% I would say would be spirited mountain road driving.

What would a Wilson Manifolds 1 inch 4 hole tapered carb spacer do to this combination?

woodsnake · Oct 23, 2011

What driving condition are you trying to fix at this point? Why do you think you need a new intake? I have an air gap on my 69 w/351W (670 Holley) and 3.89 gears, all I need now is an over drive...

robbz28 · Oct 24, 2011

If anything probably make things worse...you need to ditch that victor jr. (great drag racing intake) and go for a torker II or a high rise dual plane intake. I had a torker II on my small block camaro that I drove around on the street a lot....it did well. Also whatever camshaft you have will determine street manners way moreso than the intake will.

69Rcode_Mach1 · Oct 24, 2011

The spacer won't do anything for the car really. On a 408W I can't imagine the Vic Jr. being too crazy. I run one on my 351W and love it. Yes it needs some revs but screams up top. With yours being on a stroker it shouldn't have too much trouble moving that air through the runners at lower rpms. A lot of debate on the single plane vs. dual plane but the single planes always net more power, and rarely a decrease in torque. If you were running a 351 I would recommend something different for your needs, but with a 408 should run strong. What heads and cam you running with it? That intake won't do much good unless the rest of the engine is ready to breathe.

armand67Fstback · Oct 24, 2011

I am still in the process of gathering parts, but I already have the block, crank, pistons, and a Vic Jr intake.

I plan on getting some Twisted Wedge 205 heads for this motor in a few months.

I was debating between the Vic Jr and a Air Gap but found a decent deal on the Vic Jr.

Yeah the 4-hole spacers can get expensive.

Based on the feedback, I will go ahead and try out the Vic Jr. If it does not run the way I need it to, I will just switch over to an Air Gap down the road.

Thanks for everyone's help.

MitchGT · Oct 26, 2011

I think the manifold is a good choice for a stroker. you have an extra 57 cubes you need to feed, and with 3.89's in the back, low end torque shouldn't be a consideration. I think traction will be a bigger problem than low rpm manners....

bikefreak600 · Oct 26, 2011

a 408 + 205 heads needs a vic jr or super vic. why would you spend $2000+ on heads and consider a restrictive intake ? personally i would go with a super vic. the port size will be closer matched. and there will be no worry about lack of low end power with this motor.
big cubes + big heads= power everywhere

blown65 · Oct 26, 2011

bikefreak600 said:
a 408 + 205 heads needs a vic jr or super vic. why would you spend $2000+ on heads and consider a restrictive intake ? personally i would go with a super vic. the port size will be closer matched. and there will be no worry about lack of low end power with this motor.
big cubes + big heads= power everywhere

X2, I'm just not seeing it being too big, We have a Super Vic on our 408 with a mild cam, AFR 205's and runs 11.60's@123mph.

iskwezm · Oct 26, 2011

I have a Vic Jr on my 349 and its only street driven.

69gmachine · Oct 27, 2011

What is acceptable for street manners is rather subjective. My 408 mach 1 is 90% street driven, with an occasional open track event thrown in. I have a Torker II on my 408 and I added a plenum divider to calm it down and make it more responsive at low rpms. I spend a lot of time in traffic and at stop lights and going through school zones, so I want it to behave as well as my 2006 Toyota truck does from idle on up.

I also just bought a 1/2" 4 hole spacer I'm going to try out in the next few days. There are way too many variables to make a claim that a spacer will or will not work on a given combination as the cam, intake, and intake runner size all come into play. Spacers are cheap; the experiment is worth it regardless of how well it works out IMO.

blown65 · Oct 27, 2011

Understood, the 408 is a street deal, just happen to of taken it to the track. It drives very nice on the street though. I just think a dualplane on a 408 will hurt more than help unless you just want a torquey motor, cause IMO its going to hurt HP.

bikefreak600 · Oct 27, 2011

blown65 said:
Understood, the 408 is a street deal, just happen to of taken it to the track. It drives very nice on the street though. I just think a dualplane on a 408 will hurt more than help unless you just want a torquey motor, cause IMO its going to hurt HP.

exactly ! IMO it will only gain minimal under 4k.ish rpm. deff not worth the loss on the high end. maybe if he spent the money porting a air gap, but i cant imagine a airgap can be ported much? as stated before spacers are cheap AND universal, if it doesnt help it will work on something else, no real loss there.

armand67Fstback · Oct 27, 2011

4 hole spacer

69gmachine,

I am curious as to what will happen when you try out the 4-hole spacer on your single plane. Please post some feedback on what you see.

I will talk to the engine builder about port matching the vic jr intake to the heads so that everything is uniform.

This has turned out to be a great discussion, learned a lot.

mtaqua · Oct 27, 2011

I have a 4-hole on my chi 3.0 (I think bigger than a super vic). The intake came with a clover leaf, I had it removed and ported. The porting included being matched to an HVH (1"). It kind of makes a transition from the holes in the carb to the intake. Also, it keeps the carb cooler. I don't think a 4-hole will hurt depending on the design.

Vinyl66 · Oct 28, 2011

Do not swap out a good single plane for a dual plane on that 408. No way! Traction will be your problem NOT low end torque.
I like phenolic spacers if you can fit one. Spacers are sometimes strange in what works and what doesn't. I think a lot has to do with your current tune. But I would use one if it does nothing more than keeping your carb/fuel cooler.

69gmachine · Nov 2, 2011

armand67Fstback said:
69gmachine,

I am curious as to what will happen when you try out the 4-hole spacer on your single plane. Please post some feedback on what you see.

Well it took a while to get the new spacer on and do a test drive. It did make a noticeable difference, but keep in mind the Torker II is a small runner single plane and I've added a plenum divider separating the left and right banks. You may not notice as significant a difference on a Vic Jr.

I was able to lower the idle speed by about 200 rpm. That uncovered an off idle bog that I had not seen before. I believe I will also need to reduce my main jets as i have a stronger signal to the venturis now. It also pulls smoother at low speeds. I can go all the way down to 10 mph without it bucking, and that was one of the things I was trying to accomplish.

I will try a larger cam on the throttle to see if I can overcome the off idle bog, and drop the main jets two sizes and do another test drive.

mtaqua · Nov 2, 2011

maybe bigger squirters

69gmachine · Nov 5, 2011

There's still just the slightest hesitation if I stab the throttle from idle, but I found the major cause of the problem was a vacuum line had come off the nipple at the manifold. I tweaked the front end alignment, and after fixing the vacuum leak, I should be ready to return it to daily driver duty on Monday, woohoo!

blown65 · Nov 5, 2011

Typically when you add spacers you lean the car out, not make it run rich. Taking jets away is usually the wrong direction when adding spacers. That's of course only if you were correct to begin with. At least with the 4-5 motors I've ran on the dyno with various spacer combos. Never did it need jetting taken out.

69gmachine · Nov 7, 2011

OK, thanks for the tip. I'll hold off on any carb changes until I can get it to a chassis dyno.

4 Hole Carb Spacer on Vic Jr. on 408W Stroker

armand67Fstback

Member

woodsnake

robbz28

69Rcode_Mach1

Active Member

armand67Fstback

Member

MitchGT

Member

bikefreak600

Member

blown65

iskwezm

69gmachine

Member

blown65

bikefreak600

Member

armand67Fstback

Member

mtaqua

Member

Vinyl66

Member

69gmachine

Member

mtaqua

Member

69gmachine

Member

blown65

69gmachine

Member

Similar threads

4 Hole Carb Spacer on Vic Jr. on 408W Stroker

Member

Active Member

Member

Member

Member

Member

Member

Member

Member

Member

Member

Member

Member

Member

Similar threads

Privacy & Transparency

Privacy & Transparency