Intake manifold question - Vintage Mustang Forums
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post #1 of 14 (permalink) Old 05-14-2019, 09:55 AM Thread Starter
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Intake manifold question

Question: I'm installing a Ford Performance 363 crate engine in my 66 Fastback along with a T56 Magnum trans.

I'll be running a Holley Sniper EFI system. Trying to decide between an Edelbrock Performer RPM Air Gap or a Victor Jr. intake. There are opinions that a single plane/open plenum manifold works better with the throttle body EFI.

I understand the different power bands created by the two manifolds. My main concern is drivability, not which one makes more power.

Anybody have any real world experience?

-Bruce

1966 Fastback
Boss 363, Tremec T56 Magnum, Squirrel on a hamster wheel when I need extra power...
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post #2 of 14 (permalink) Old 05-14-2019, 10:06 AM
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Dual plane has always been better suited for streetability, mid range torque to 5500 rpm Hp I believe.

'66 Tahoe Turquoise/ Aqua coupe
•289 / 4100 •C4 Auto •Disc Brakes
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•Rally Pac •Console •Deluxe Belts
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...my first car

'66 Emberglo / Parchment coupe
•289 / 2100 •C4 Auto •Disc Brakes
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post #3 of 14 (permalink) Old 05-14-2019, 10:40 AM
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With the additional cubic inches you have the Victor jr would be my choice. What are your cam specs? The Air Gap is the same intake as the Performer RPM on the 302. They can support about 475-500 HP

Last edited by cmefly; 05-14-2019 at 10:43 AM.
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post #4 of 14 (permalink) Old 05-14-2019, 10:51 AM
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Single plane for EFI applications.
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'66 GT350H-3 time cover car - Car Craft July'77,Modified Mustangs and Fords Feb2011 ( w/article), Mustang Monthly June 2014. Bracket raced by me for the last 44 years. Yes it is a real one.
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post #5 of 14 (permalink) Old 05-14-2019, 11:37 AM
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I saw your question on Facebook and checked out the profile pic, need to change it from that German ride to the Mustang.....lol. Got more pictures and details on the car?

Coyote build in 65 GT Fastback in body work https://forums.vintage-mustang.com/b...e-powered.html and on Facebook @65gtmustang
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post #6 of 14 (permalink) Old 05-14-2019, 11:57 AM Thread Starter
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Quote:
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I saw your question on Facebook and checked out the profile pic, need to change it from that German ride to the Mustang.....lol. Got more pictures and details on the car?
Yeah, I have some Italian trash too!

I do have more Fords than European rides! I used to race Porsches in endurance stuff (24 Daytona, etc.). My main racing career was in Mustangs in the Trans-Am series throughout the 90s.

I'll post photos and details as soon as I finish it. The fastback in my signature is the "before" photo, though not much is changing to the exterior other than wheels and tires.
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-Bruce

1966 Fastback
Boss 363, Tremec T56 Magnum, Squirrel on a hamster wheel when I need extra power...
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post #7 of 14 (permalink) Old 05-14-2019, 12:01 PM Thread Starter
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Originally Posted by cmefly View Post
With the additional cubic inches you have the Victor jr would be my choice. What are your cam specs? The Air Gap is the same intake as the Performer RPM on the 302. They can support about 475-500 HP
I'm leaning towards the Vic Jr as well. The cam is pretty healthy. It's the current Ford Factory crate 363, 507 HP on pump gas (though they used the Victor 8.2 for their dyno runs)

I have both manifolds, so I guess I can A/B them!

-Bruce

1966 Fastback
Boss 363, Tremec T56 Magnum, Squirrel on a hamster wheel when I need extra power...
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post #8 of 14 (permalink) Old 05-14-2019, 12:04 PM Thread Starter
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Originally Posted by myfirstcar66 View Post
Dual plane has always been better suited for streetability, mid range torque to 5500 rpm Hp I believe.
Absolutely true with a carb, but there seems to be some question which is better with throttle body EFI. Some people are reporting part throttle issues with dual planes.

-Bruce

1966 Fastback
Boss 363, Tremec T56 Magnum, Squirrel on a hamster wheel when I need extra power...
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post #9 of 14 (permalink) Old 05-14-2019, 12:36 PM
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If you read the details on that Ford engine they got the quoted HP numbers with a Super Victor and 750 Holley, so I would consider that, or the Vic Jr. instead of an Air Gap. Peak Torque is shown at 5,300 RPM, so don't try and make a tractor out of it.

'65 A-code coupe, T-10 4-speed, 8" 3.25 limited slip
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post #10 of 14 (permalink) Old 05-14-2019, 01:07 PM
LSG
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Tongue intake

BarkBruce, if you want streetability, the dual plane has it. The EFI Throttle body thing is because some folks don't know how, or where, to mount the sensor. There are MILLIONS of TBI dual plane engines out there, and they're fine. You may wish to add an open spacer or cut down the divider wall abit. The dual plane also helps you if your cam is on the larger side. You can make either setup work just fine, the question is what personality do you want your engine to have ? LSG
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post #11 of 14 (permalink) Old 05-14-2019, 01:44 PM
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Goodness, how times have changed! We're recommending a single plane intake for DRIVABILITY!

Never thought I'd see the day.
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post #12 of 14 (permalink) Old 05-14-2019, 02:35 PM
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Well, if my Primary consideration was drive-ability, I wouldn't buy a 500 HP 363 ! Just saying ...

That engine package was designed with a single plane and 6500 RPM HP peak, it seems counter-productive to change one part of a matched package.

'65 A-code coupe, T-10 4-speed, 8" 3.25 limited slip
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post #13 of 14 (permalink) Old 05-14-2019, 03:41 PM
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I have a MassFlo EFI setup on a pretty strong 347 in my FFR Cobra replica. It's similar to the EFI systems you're looking in that it mounts to a standard carb style intake, but it uses the fox body mustang computer and wiring. It has a single plane intake with injectors at each of the runners (where as the bolt on EFI systems out today put injectors in the throttle body which looks a lot cleaner).

It could be because of how the Mustang mass flow programs work, but I remember reading when my system was first released that it required them to use a single plane intake...I think they tried testing it with a dual-plan and drivability wasn't great.

I would probably stick with a single plane intake for EFI just based on my experience.

To be certain though, I'd contact the manufacturer of whatever setup you're going to buy and ask for their recommendation. They've probably tested it on a number of intakes.

Dan
Chapel Hill, NC
***PM me if you're close by and can lend a hand with my 65 Fastback project***
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post #14 of 14 (permalink) Old 05-14-2019, 07:05 PM
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Quote:
Originally Posted by LSG View Post
There are MILLIONS of TBI dual plane engines out there, and they're fine.
Yes, but are they using a vacuum signal for any sort of fuel or air metering? I wouldn't confuse the function of some 1980s TBI with these modern TBI setups.

The problem with dual planes on a 500hp engine- fuel injection or carb- is that none of them flow well enough to support it out of the box.

1965 Mustang

Last edited by jdub; 05-14-2019 at 07:08 PM.
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