when is it time to go from dual to single? does a single or a dual plane work better with nitrous? would i gain or lose by going to a single.

specs:
72 chevelle
3375 lbs,355,th350,373 gears.
9.75 compression, performer rpm intake and cam, vortec heads 1 5/8 headers.

made 303rwhp and 362rwtq and runs 13.12@ 103.

you asked when it is time to go to single plane from dual plane............it depends on the cam, gears, stall, and what rpm range you are running your motor in. i myself would go to a single plane when the cam is from 3000 rpms and up and when you run a stall 3000 rpms and up and if you have gears from 3.73 up number wise........

which is better for nitrous you ask single or dual plane.........single plane would be......


now if you would gain or lose with a single plane it depends on your combo......cam and stall....

from what i read on your stats i would say you may lose some if your not turning your motor past 6500 rpms.........

kinda neat to see your combo running along with a motor i built for a friend.....his is a 350 .060 over with 10.2 to 1 compression with 11 to 1 pop up pistons, using junk stock 76cc heads that have stock valves 1.94 1.50 installed with 3 angle valve job, z28 springs with a summit 234/244 @ .050 cam with .488/.510 lift, 3000 stall, 3.73 gears, rpm intake and 750 carb,and summit headers. with his car weighting in about 3600 lbs with him in it and shifting by ear (tach was not working at the track) with street tires and mufflers he ran a 13.32 @ 103.44 mph....... with a best of a 2.00 60 ft......not sure how hard he was turning it but we are going to try and improve on it since the motor was not dialed in at all........we played with it for one day at the track....never did get a good solid launch.....he needs my slicks...lol....

i have a tci breakaway w/ anti ballooning plate. i think its like 2400 stall.

I can only speak from my own experience with one motor combination. I did back to back testing with a Team G and a Holley 300-36 Street Dominator dual plane. The Team G ran a best of 12.41 and the 300-36 ran a best of 12.01. 60's increased from 1.70 to 2.08 with the single plane, and it only gained .09 on the back half. This is on a 10.3:1 350 with ported Dart heads, Holley 3310, 252/262 @ .050 solid F/T cam, and a 3500 RPM converter - shifting at 6500. Now some will argue that my cam is too big for my motor/compression and that the dual plane only crutched a poor combination - you be the judge. The single plane did however, seem to outperform the dual plane when doing burnouts on the street. My theory being that with no traction the motor was revving quicker into the 6500/7000 RPM range and staying there.

I am buidling a 383 right now that will use the same cam and heads as the 350 and I may try another back to back comparison to see if the additional cubes will favor the single plane.

Having said that, my personal opinion is that, assuming a solid hook, a single plane will only out perform a good dual plane with a light car (3000 or less with driver),4500+ converter, 4.56 gears, 13:1 CR, and a 7500 RPM shift point - nitrous may be an entirely different story.

I went from a RPM to a victor on my SB 383 because power below 3500rpm was not a concern.