[78w72]

Anyone using the sniper 2 or sniper set up that can confirm the best type of intake? Ive read dual plane & single for EFI set ups like this each have benefits, which type of intake works best with sniper 2 EFI?

This is on a 501/455 stroker engine, 320cfm E-heads from butler, probably go with the northwind & a drop base air cleaner on a 73 firebird with aftermarket VFN formula hood... but will change the intake if theres a better option like the hurricane or torker 2.

[steve25]

How much of that 320 cfm out of those E heads are you using?

A T2 in stock form is only good to about 265 cfm without a spacer, but even with a spacer will not get you to 300 cfm.

[i82much]

Originally Posted by steve25

How much of that 320 cfm out of those E heads are you using?

A T2 in stock form is only good to about 265 cfm without a spacer, but even with a spacer will not get you to 300 cfm.

any idea what a T2 flows with a 1 inch open?

[78w72]

How much? Not really sure how to answer that... the heads were suggested from butler based on the ~600hp power level desired, they also suggested/provided the cam to use, I can get specs on that if needed but its a comp hyd roller probably similar to the OF specs.

They are porting the northwind intake too, not sure how much or if just a gasket match to the heads... but when I questioned what type of intake is best to use for the sniper EFi we put the intake/porting on hold till we know whats best to use.

Thanks for the reply on the T2 cfm... but can you answer the main question on what type of intake is best for EFI, single or dual plane?

[JLMounce]

I have had a FiTech system on both a dual plane and a single plane intake. While the FiTech functioned fine with no ill driving effects with the dual plane manifold, the single plane manifold did have noticeably better fuel distribution via plug reading.

The Northwind intake is likely a good choice for you here. If that's what you were planning on running with the build, that's what I'd run.

[78w72]

Yeah the northwind was what butler suggested and probably what we will go with using a drop base air cleaner...

Just wanted to ask if something like an RPM was better for EFI, I recall reading some mixed reviews on what modern EFI's liked best, single or dual intakes... something about the fuel "signal" on dual planes being an issue or Cliff not liking drop base air cleaners...

Thanks for the reply, probably just stick with the northwind

[Skip Fix]

A T2 with a 1/4 front x3/8" rear spacer flows enough for a 455 to push a 3750Lb car to 124mph on 320 cfm SD CNC heads!
With a TB setup and a dual plane either an open spacer or cut down the center divider some or a single plane so both banks get the fuel when it is sprayed.

[JLMounce]

Originally Posted by Skip Fix

A T2 with a 1/4 front x3/8" rear spacer flows enough for a 455 to push a 3750Lb car to 124mph on 320 cfm SD CNC heads!
With a TB setup and a dual plane either an open spacer or cut down the center divider some or a single plane so both banks get the fuel when it is sprayed.

Even with TB injection, adding the spacer to reduce the turn radius of the fuel air charge into the ports, is definitely helpful.

Unsure what kind of effect it would have on a port injected deal. Considering the air would not also be carrying the fuel mass, likely less of an issue.

[Formulajones]

I've run snipers on both dual and single plane intakes with 600+ HP combos and to be honest they function fine on either. I had no tuning issues at all.

I let the engine combo decide what intake is best, not necessarily the fuel mixer since it's still a wet flow setup.

With a 500ci Pontiac, if you aren't trying to look stock, I wouldn't even think of putting a dual plane on it. It'll make so much friggin torque down low anyway you don't need to try to enhance that part with a dual plane. I'd do a single plane and never look back.

[JLMounce]

Originally Posted by Formulajones

I've run snipers on both dual and single plane intakes with 600+ HP combos and to be honest they function fine on either. I had no tuning issues at all.

I let the engine combo decide what intake is best, not necessarily the fuel mixer since it's still a wet flow setup.

With a 500ci Pontiac, if you aren't trying to look stock, I wouldn't even think of putting a dual plane on it. It'll make so much friggin torque down low anyway you don't need to try to enhance that part with a dual plane. I'd do a single plane and never look back.

This is true.

My +0.040 455 makes gobs of torque even with the T2 on it.

Port matched T2 with a 310cfm D port made 580/600. A northwind on a 320cfm 500cid Poncho is not going to leave you wanting on torque.

[RocktimusPryme]

I run a Terminator on an RPM, runs great. The guys at EFISystemPros say the negative dual plane stigma with TBI setups is a farce.

I will say adding a thick 1/4 gasket helped reduce the "whooshing" noise the TBI sytsems sometimes have.

[78w72]

Thanks for the replies, will pass that along to the owner of the car, sounds like the port matched northwind is the best choice for this combo.

[Gator67]

I couldn't run anything taller than an HSD (copy) on my OEM-hooded 70 Formula (535 w/sniper)...with that intake, there's just enough room w/drop base & 3" filter...I tried a 2" filter w/drop based but that set up looked like it would restrict air flow. The engine in that car is placed 1.5" rearward, so that might affect things. The car runs great. No tuning issues.

[78w72]

Originally Posted by Gator67

I couldn't run anything taller than an HSD (copy) on my OEM-hooded 70 Formula (535 w/sniper)...with that intake, there's just enough room w/drop base & 3" filter...I tried a 2" filter w/drop based but that set up looked like it would restrict air flow. The engine in that car is placed 1.5" rearward, so that might affect things. The car runs great. No tuning issues.

What drop base air cleaner do you use? This will be the aftermarket one PTFB sells... think it used to be the WFO?? The northwind looks to be similar height as the RPM? so should be able to get the PTFB drop base & northwind under a aftermarket formula hood.

I have the VFN fiberglass hood on my 72 and run a factory HO aluminum intake that is same height as other irons, with a 78 TA air cleaner there is very little room, about 1/2".

[R 70 Judge]

I'd vote for the Northwind as long as you have the room for it. I have an EFI converted Northwind on my car and I'm happy with it.

[nUcLeArEnVoY]

You can run an RPM and just mill down the plenum divider 3/4". I've heard of people doing that.

[RocktimusPryme]

Originally Posted by nUcLeArEnVoY

You can run an RPM and just mill down the plenum divider 3/4". I've heard of people doing that.

3/4 is pretty aggressive. But that's how mine is set up, divider milled down about 1/4". If you run a thick gasket it would likely have the same effect.

[Skip Fix]

A Holley SD can support 600+ HP if modified like Dave at SD used to do-what the Tomahawk is basically.

The Corvette L88 base is a full 2" drop base what I have on the IA with a 4" -all that fits under the Camaro cowl.

Unless you a wanting the run deep in the 10s a T2 WILL flow enough for an average weight A body or F body. Two different motors 2 different T2s 10.90s @ 123 or 124 in good air through mufflers and tailpipes. And swapping same Demon 850 from a dual plane ported HO intake(and that ran 3 sec faster than a Qjet) idled better than the dual plane as all the cylinders saw all 4 bbls. Would be the same with a TB.

[78w72]

This is for a friends car/engine Im helping him build, hes decided on the NW based on power goals & butlers recommendation... as long as it will fit with a PTFB/WFO drop base air cleaner. Also a dual plane is probably no benefit as mentioned above, dont need the extra torque in lower RPMs.

Ive seen the measurements posted before but cant recall specifics... anyone confirm if the NW is the same height as an RPM? If so, or close, it should fit under the hood with the aftermarket drop base air cleaners.

[napster]

I have the sniper 2 on my '78 TA and my 1970 GTO. I find them to be really good on both of the 461's in the cars. Intake in both is the Performer RPM. The '78 has a drop base unit while the GTO doesn't. The stock RA setup is used on the GTO. In order for it to fit under the hood about 1.5 inches was taken off the foam seal. Since I don't race this setup suits me fine. If you race, probably not what you want.