I have only ever run 727 boxes so not familiar with powerglides. What is the ratio of 1st gear in powerglide compared to 727 ???

Its not top secret. I have been out loading for Norwalk. The car is 2550 with me in it. I named it Anorexic. I thought the 4:10 should pull it with the 1.76 first gear.If you watch the first video once it gets to the 1/8 and gets in high gear it flys. I have tryed 2 brand new convertors. One was 5,000 the other 5,800. The 5,800 is whats in it for this weekend. It has 6 passes on it.For this weekeng I am going to look at timing and carb. If I don't find anything then a gear change will happen. I will post some time slips from Norwalk. I am predicting 6.55 in the 1/8. It is very consistant. Birdtracker

Have you confirmed these converters... have you run them up
on the trans brake with no chip in it

What's your valve lash set at?

valve lash is .022 cold. Both convertors flash what they should.I also had the trans out this spring and had it gone thru at a trans shop. New transmission lines and cooler. Birdtracker

Still no motor info.

For a comparison......a friends S/G Cuda from about 10-12 years ago.
2700lbs, 4.88's, 15x33's, glide, 1.76 low, 451 low deck, std port stage 6 heads, tg4500 intake, 1200 carb, 2 1/8 x 4 headers, UD 280/685 roller....... Motor dynoed 650hp.
Went 9.30's at 143. My recollection is that the 60' times were in the high 1.20's.

So I ASSume it around a .028 hot cam? I run mine at .014 cold and end up around .020........this is about WAY more than lash cos something is amiss here big time...........

Cam too much duration for cubes and not enough gear...a 470 cube big block with a 287 @ .050 cam, you better have good heads and spin it to 7500 plus.. I think the 119 was a typo....

Why? We used to run 452 inches with unported heads and the old .750 roller and didn't have to spin them 7500 to make power. But I doubt the motor is the issue with this car.

If and I repeat IF the 119 is not a typo, at 2550 pounds, this thing makes 650ish on HP, which is not tough for an alum headed 470 if it has decent parts. That said, you should be able to kick it off the line and make it 60ft harder than it is, even with 4.10s and a 1.76 glide. I think the converter is way out in left field

I agree Monte, he's using converters for heavy cars (3000-3400 lbs) not the light car he has because it looks like it locking up right off the line. usally what works for a heavy car won't work for a lite car, especially a glide.

Two brand new converters, one 5000 and the other 5800, has tried leaving at numerous different RPM's........ While it certainly could be a converter issue, it would seem as though this has been ruled out.
I still say a footbrake launch might prove interesting...... Besides being easy and basically free.

A tale of two cars, 68 dart 440-727-9" vert, 3200 lb loaded, car left good, wheels in the air ran 6.80 in the eight. 86 Daytona 2500 lb loaded same engine-trans combo out of Dart. Best was 6.55, left like a turtle. Had converter made (same flash) for car then ran 6.08 best.

It really acts like the cam timing is retarted... soft
on the bottom end then starts to turn on up in the revs

The op can confirm or deny this, but here's how I see it played out;
Build car/motor, buy a new 5000 stall converter for the combination, go to the track, car won't leave. Calls a few people, a few people see the car run..... the consencus is the converter is wrong for the combo.
Get new 5800 stall converter built, car runs the same.

Since he says the car pulls hard after shifting into high, my feeling is the trans is bound up in low gear.

I had a trans brake solinoid quit working. I rolled in deep staged and foot braked it, Average 60 foots are 1.65. It was 1.74 on that pass. That was at Nationl Trail at this years spring race. With average 60 fts of 1.65 if it would go 1.30 or 1.20 or 1.18 I would know I solved my problem.
So if I pulled all the plugs out of it so it would roll over, Take the lash out of the #1 intake, put a degree wheel back on the front of the motor, and check .050 before and after with a dial indicator that would tell me cam degrees. I did this with the heads off when I put the motor together. Also I think it would start hard with the cam retarded. Thanks for the suggestions. Birdtracker

How about a compression test just to see what kind of cranking pressure it has.

Is the assumption correct that both of these converters were built for this specific combination?
If so, I don't see how they could get it so wrong....... Twice.

At 119 mph in the 1/8th, leaving like a pooch that tells me this car is making a lot of power, just not much till the Rs get up over 6500 with that cam? My guess is the REAL 1/8th mile per hour would be 121 if it got moving better early. That would be about a 5.75 in the 1/8th, or 9.0 in the 1/4. The 4.10 gear gives you a SLR of 7.40, and I would think it needs more like 9 or higher for decent results. However, it sounds like it is all three issues pointed out. Not enough gear, wrong converter, and a very big cam for that motor and trans combo.
If it were my car, I would borrow a much shorter cam, somewhere around 280/288/110 like my Isky RR735, get a converter built to stall 6500, and put a 4.88 gear in it.

"Very big cam"............Really Greg, cmon now. That's not a big cam at all for a nearly 500 inch motor that apparently makes decent power

There is no motor into other than the cubes and the cam.
It could be a 10.5:1 motor with unported 516 heads, or a 15:1 B1 motor.
Without knowing what the build is, it's certainly possible the cam is too big, which is why I suggested a compression test. If it pumps 125-150, the cam is too big. If it's 190-220, it's not the problem.

Essentially no useful motor info has been provided, nor has it been confirmed whether or not the two new converters were actually built for this particular combo, or if they were simply "new".

IMO, not enough pertinent info has been provided about the overall combo to make a real recommendation.

In any case, he said he was going to Norwalk this weekend, so I'm sure he'll get plenty of suggestions there.

I am only going by the fact he says it goes 119. Even at the light weight, 119 in the 1/8 with a horrible 60ft means it makes some steam