Dual plane to single plane track test in the works

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I got the best power with an airgap and one inch open spacer on a 408. Didn't try a single plane. Cam 235/249/107 EQ. heads, 10 /1 compression.
Max hp 5700 and carried it to 6,000 . max torque 4700. I am betting on the airgap if you use an open 1 inch spacer if you shift at 6200. My guess is it would run stronger with the single plane with more rpm.
 
Don, my 340 went 1.52 60’, 7.24 with the Weiand intake, a Quick Fuel 750, 4.30 gears and a 237/242 hydraulic flat tapper cam. It was 3250 pounds.

I think you’ll pick up, may have to do a little carb tuning though.
 
Hate 1/8 mile. Prefer 1/4. But i like racing, enjoy the competition. So that doesn't change.
On weekends i race, i usually go up on Fri night to test and tune to hit the tree a few times
That is still 1/4 mile and track is prepped
It is what it is, but at least that way if i want to test changes i intend to make( like this manifold) i can still do so on the 1/4
 
I like the Victor 340 single plane. My car is mostly street and does just fine with it!! Has very good pull even down low. 3.91's out back and 9.5" 3400-3600 stall converter help too!
 
I know you’ve got another engine going in with the Weiand (so you obviously like it) but did you ever get to finish the intake comparison on the original setup here?
 
I know you’ve got another engine going in with the Weiand (so you obviously like it) but did you ever get to finish the intake comparison on the original setup here?

i didnt.
I sold the old motor along with the intake to a buddy for his project.
Ended up racing so much last year never took the time to make the swap
 
i didnt.
I sold the old motor along with the intake to a buddy for his project.
Ended up racing so much last year never took the time to make the swap
I’m in the process of installing my TF’s with bigger solid cam on my stroker. Plan is to start with the Air Gap and see how it does for a while after proper tuning then try that modified M1 single I have. My testing will be done at the track, I’ll see how things shake out.
 
I’m in the process of installing my TF’s with bigger solid cam on my stroker. Plan is to start with the Air Gap and see how it does for a while after proper tuning then try that modified M1 single I have. My testing will be done at the track, I’ll see how things shake out.

i honestly wouldnt even bother with the airgap with your heads.
Mine was done about 6400-6500. Refused to pull past that. I know there was zero issues with springs, etc, etc. highly suspect it was the dual plane as the culprit.
 
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I'm going to do the same as 12many, run the air gap to get some times down but then I'll be switching over to the Trick Flow intake. Should be a fun Summer
 
I was running the Excellerator on my 408 and with only a 3000 stall went back to a DP. LD 340 with the divider ground out for a TQ carb. (Done this a long ago when i was running TQ on my 340). It help a little on the 60 foot and et.
Installed a 4200 converter and now want to go back and give the Excellerator a second chance.

For me i don't know if it will help. Because it go's to sleep after 5800 rpm. I run it out to 6600 rpm on a 1/4 mile track but it just rpm and no power past the 1000 foot mark.

So if i can get my life back on track, i will be doing a similar test this summer.
 
i honestly wouldnt even bother with the airgap with your heads.
Mine was done about 6400-6500. Refused to pull past that. I know there was zero issues with springs, etc, etc. highly suspect it was the dual plane as the culprit.
I don’t doubt you. It’s just that I want to see what the airgap does at the track being my carb is dialed in with that intake although I know with the different heads and much bigger cam I’ll have to do some tuning. I just wanna see what kind of tuning I’ll have to do but at least it’ll be in the ballpark for the dual plane. Then I can put the M one on and go from there and see what it does.Mainly it’s for my own personal satisfaction to see what I can do with both.
 
I don’t doubt you. It’s just that I want to see what the airgap does at the track being my carb is dialed in with that intake although I know with the different heads and much bigger cam I’ll have to do some tuning. I just wanna see what kind of tuning I’ll have to do but at least it’ll be in the ballpark for the dual plane. Then I can put the M one on and go from there and see what it does.Mainly it’s for my own personal satisfaction to see what I can do with both.

remember too, the motor that air gap ran out of steam on was a stock stroke 360 with plenty of cam..260@50
I shudder to think what would happen on a 12.5 compression 418 with bigger needs
 
I've said this before, if your performance built stroker requires a dual plane intake to have low end power something is wrong in your combo.
 
I've said this before, if your performance built stroker requires a dual plane intake to have low end power something is wrong in your combo.

Agree.
Make that stroker pull almost 4,000 pound car, down the track, at 6600 foot elevation (8000-10,000 adjusted altitude)
Makes that stroker work Mitty hard.

With that being said, my stroker 60' way better them my 340.
 
My street dart sport 360 had an airgap before. It replaced a ld4b which was an improvement. So continued to run airgap and was happy. Later did a cam swap and got curious to try a single plane intake. A member here was selling a cherry Victor 340 intake. Long story short we traded. At 1st was nervous of the decision I made. But this intake works so much better than the airgap in my opinion! 360 is more responsive everywhere.
 
My street dart sport 360 had an airgap before. It replaced a ld4b which was an improvement. So continued to run airgap and was happy. Later did a cam swap and got curious to try a single plane intake. A member here was selling a cherry Victor 340 intake. Long story short we traded. At 1st was nervous of the decision I made. But this intake works so much better than the airgap in my opinion! 360 is more responsive everywhere.
Just a little intake info for you guys based on my experience : Disclaimer ! I m by no means an expert or have any idea what I am talking about but here goes, many years ago we tried an intake swap on one of my 340s while on the dyno.. a brand new out of the box Victor 340 was 13 hp better than the gasket matched Strip Dominator, a few years ago before the chaos I spoke to Ryan J about switching from a Victor to an Indy 360-1 on my 363 he said there wouldn't be enough difference to warrant the swap. also my present stroker 408 with 4.10s 60fts the same as my 363 ( 30 0ver 360 5.9 block W2 heads ) did with 4.88s mainly due to 52 more pounds of torque over my 363. I have an Indy 360-1 set up ( heads and intake ) on my present 408 it must be an efficient manifold two years ago we milled one inch off the top so I could accommodate a different plate style throttle stop , well I lost 3 mph it didn't`t work out so I put on a one inch Super /Sucker and got about 1 1/2 mph back installed a one inch open and got the full 3 mph back. Based on my 6 different small block combos over the years an open plenum intake was always better than even a highly modified dual plane ( LD340 ) but then again these are race only.

7106172F-BCF1-46FF-A356-67C87D357DFE.jpeg
 
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Just a little intake info for you guys based on my experience : Disclaimer ! I m by no means an expert or have any idea what I am talking about but here goes, many years ago we tried an intake swap on one of my 340s while on the dyno.. a brand new out of the box Victor 340 was 13 hp better than the gasket matched Strip Dominator, a few years ago before the chaos I spoke to Ryan J about switching from a Victor to an Indy 360-1 he said there wouldn't be enough difference to warrant the swap. also my present stroker 408 with 4.10s 60fts the same as my 363 ( 30 0ver 360 5.9 block W2 heads ) did with 4.88s. I have an Indy 360-1 set up ) heads and intake ) on my present 408 it must be an efficient manifold two years ago we milled one inch off the top so I could accommodate a different plate style throttle stop , well I lost 3 mph it didn't`t work out so I put on a one inch Super /Sucker and got about 1 1/2 mph back installed a one inch open and got the full 3 mph back.

View attachment 1715684005


Most of that 13 HP was in the carb pad and that jacked up TQ cut out on the secondaries.
 
well I lost 3 mph it didn't`t work out so I put on a one inch Super /Sucker and got about 1 1/2 mph back installed a one inch open and got the full 3 mph back. Based on my 6 different small block combos over the years an open plenum intake was always better than even a highly modified dual plane ( LD340 ) but then again these are race only.

My 434 has Indy heads and intake that hasn't had the carb flange milled. When it was on the dyno and the air/fuel ratios were off bank to bank. We installed my 1" Super Sucker it picked up 13hp and the a/f ratios came in line bank to bank. Maybe we should've tried a 1" open too.
 
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