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I'm considering a M1 intake for my 505 ci RB engine I'm building.
Anyone running one?
The car and engine specs are as follows:

E body
2:23 gear
727 with 9.5 PTC conv. 2800 stall
Ported E heads
10.8 comp
Hyd roller 245@ .050 dur / 540 lift
Headers

The car is not a race car but will see the strip occasionally

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Are you sure the gears are 2.23 and not 3.23 The single plane intakes are normally a little lazy below 2500 RPM with a stock stroke and bore stockish type motor, with a stock converter that can be a detriment With a big inch stroker and a good converter not so much Your combination will be good either way The RPM intake will make more torque and HP below 4500 RPM than the M1 will(I've dyno tested both a on 496 C.I. RB stroker)at WOT but after that the M1 takes over all the way to 6500 RPM

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Running the 4150 M1 on the 493.

iron heads, 0.530/260 @ 0.050 cam, makes enough torque to cook the 315 drag radials at will.

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Thank you.........I laugh(sometimes)when I hear about guys that can`t get a single plane to work on a fairly mild combo........kinda like t-rams do`t work down low. Get the carb clean and tune right and I`ll take the single almost always.........

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Doesn't make much vacuum with that cam, but have a 4 hole spacer to help the signal out (maybe I'll give a tapered spacer a shot), drivability is no worse than my mild high 12 sec small block Dart.

The 500" motors make so much bottom end, I don't think a dual plane is really needed.

The off the shelf 10" 3k converter flashed to north of 4k, the Dynamic 9.5 is about the same, so low speed drivability was never really an issue. Normally run 3.55's, a 30" tire and it's a somewhat heavy car...

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YEP.................

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Running the 4150 M1 on the 493.

iron heads, 0.530/260 @ 0.050 cam, makes enough torque to cook the 315 drag radials at will.

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Thank you.........I laugh(sometimes)when I hear about guys that can`t get a single plane to work on a fairly mild combo........kinda like t-rams do`t work down low. Get the carb clean and tune right and I`ll take the single almost always.........

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I never said a single plane CAN'T work.... It'll work just fine. I just think you're giving away mid-RPM torque to a good dual plane, and you're not making it up. I'm guessing if you looked at the RPM range that cam works best in, it will darn near mirror the range of an RPM. The M1 is gonna start to outshine the RPM at about 6000. His cam is done by then.

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Running the 4150 M1 on the 493.

iron heads, 0.530/260 @ 0.050 cam, makes enough torque to cook the 315 drag radials at will.

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Thank you.........I laugh(sometimes)when I hear about guys that can`t get a single plane to work on a fairly mild combo........kinda like t-rams do`t work down low. Get the carb clean and tune right and I`ll take the single almost always.........

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I never said a single plane CAN'T work.... It'll work just fine. I just think you're giving away mid-RPM torque to a good dual plane, and you're not making it up. I'm guessing if you looked at the RPM range that cam works best in, it will darn near mirror the range of an RPM. The M1 is gonna start to outshine the RPM at about 6000. His cam is done by then.

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Agreed to a point and of course more gear and vert can usually over come any low/mid range issues at least it did for me.

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My 493 makes over 500 ft/lbs from 2000 to 5000. Peaked at 600 @ 4000.

That was with an M1 with TBI and an MP509 cam. The only reason I changed the converter to a 2800 stall was because it idles at 1100 and it was banging the crap out of the drivetrain every time you shifted out of Park.

It's in a 4800 lb C-body and other than the harsh engagement it drove just fine with the stock converter and 2.76 gears. It has 3.23 now and the engine sounds happier at part throttle cruise.

Kevin

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I`m guessing the TBI helped keep it nice and clean............

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My 493 makes over 500 ft/lbs from 2000 to 5000. Peaked at 600 @ 4000.

That was with an M1 with TBI and an MP509 cam. The only reason I changed the converter to a 2800 stall was because it idles at 1100 and it was banging the crap out of the drivetrain every time you shifted out of Park.

It's in a 4800 lb C-body and other than the harsh engagement it drove just fine with the stock converter and 2.76 gears. It has 3.23 now and the engine sounds happier at part throttle cruise.

Kevin

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I`m guessing the TBI helped keep it nice and clean............

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Well...

It was AWFUL at first. I knew just enough about EFI and O2 sensors to be dangerous to myself and others. 76 deg of overlap causes a lot of reversion which causes a lot of random misfires which will drive a closed loop system absolutely bonkers.

Fortunately while I may not be that smart, I know people who are.

My buddy while not familiar with the 950 Commander system, discovered pretty quick that it could be set to switch between Alpha Numeric and closed loop so we set it to run A/N under 1800 and played with the map until it was happy, much like you would with a carb. Happy was no where near stoic I might add.

Once the engine was past 1800 it cleaned up enough that it would tolerate closed loop again without going into yo-yo mode and it was good to go.

Kevin

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Thank you.........I laugh(sometimes)when I hear about guys that can`t get a single plane to work on a fairly mild combo........kinda like t-rams do`t work down low. Get the carb clean and tune right and I`ll take the single almost always.........

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What makes you think I said I can't get the single plan on my 511 to work right. It works fine. All I said was "If I did it again I would go with a duel plane". My car is street driven, has AC, PS, PB, weighs 4000 lbs, a GV and a small cam that runs out of steam around 5400. It's only turning 2400 RPM at 70 MPH thus no advantage in running a single plan.