Went to the track Friday. What should I try next?

[64plymouth]

I made it to the track Friday night it was the 3rd time this year. The car is a 64 Belvedere. It weighs 3724 with me and 8 gallons of fuel. The engine is a 505 440source kit 10.75 to 1 compression Solid roller cam .631 lift duration @50 int 264 ex270 lobe seperation 110. Indy EZ heads from Porter Racing Heads. Factory style crossram with 2 750 eddie carbs. I have tried 2 different convertors first stalled 4200 2nd stalled 5100. The rear is a Dana 60 with 4:10 gears, 29.5 X 9 bias slicks SS springs and truck shocks. The car runs good doesn't miss or lay over. The first time out car was ill handling. So scaled car got corner weights set. Rebuild front end and got an alignment. The 2nd trip a Aug 4. The car ran good and straight. I made 6 passes I tried different air pressure in slicks ,launch RPM & shift RPM (5800 & 6000). The 60fts were 1.58-1.56 ET' 11.03-11.09 & MPH 120-121.This was over 5 hours and weather got cooler. The 3rd trip I changed convertor. The first pass launch RPM was 3000 shift 5800 trap rpm 6200. 60ft 1.588 1/4 et11.132 120.22 mph. 2nd pass 2,500 launch shift 5800 60ft 1.579 1/4 et11.088 mph 120.84. 3rd pass changed timing from 36 to 34 degrees launch rpm 2200 shift 6000 60ft 1.576 1/4 et11.083 mph 121.10. I'm trying to get solidly into the 10's. Not sure what to try next. My local track is done for year September 30 so I have one more chance this year. Thanks Mike

 

[RemCharger]

Try shifting at 6500? ( which still seems low, but I don't know the limits of those intakes)

 

[RemCharger]

@ksurfer2

 

[not so famous bob]

I made it to the track Friday night it was the 3rd time this year. The car is a 64 Belvedere. It weighs 3724 with me and 8 gallons of fuel. The engine is a 505 440source kit 10.75 to 1 compression Solid roller cam .631 lift duration @50 int 264 ex270 lobe seperation 110. Indy EZ heads from Porter Racing Heads. Factory style crossram with 2 750 eddie carbs. I have tried 2 different convertors first stalled 4200 2nd stalled 5100. The rear is a Dana 60 with 4:10 gears, 29.5 X 9 bias slicks SS springs and truck shocks. The car runs good doesn't miss or lay over. The first time out car was ill handling. So scaled car got corner weights set. Rebuild front end and got an alignment. The 2nd trip a Aug 4. The car ran good and straight. I made 6 passes I tried different air pressure in slicks ,launch RPM & shift RPM (5800 & 6000). The 60fts were 1.58-1.56 ET' 11.03-11.09 & MPH 120-121.This was over 5 hours and weather got cooler. The 3rd trip I changed convertor. The first pass launch RPM was 3000 shift 5800 trap rpm 6200. 60ft 1.588 1/4 et11.132 120.22 mph. 2nd pass 2,500 launch shift 5800 60ft 1.579 1/4 et11.088 mph 120.84. 3rd pass changed timing from 36 to 34 degrees launch rpm 2200 shift 6000 60ft 1.576 1/4 et11.083 mph 121.10. I'm trying to get solidly into the 10's. Not sure what to try next. My local track is done for year September 30 so I have one more chance this year. Thanks Mike

bigger tires , higher launch rpm ...jmo

 

[wedgie]

At 3724# maybe it's diet time?

 

[fourgearsavoy]

What is your trap RPM ? I would bet that combo could use some more gear although I understand time is short for a gear change in the Dana.
Your short times are decent so the car must be hooking up.
Gus

 

[64plymouth]

Trap RPM is 6200. I know diet is in the works. I'm 240 need to lose 50lbs

 

[padam]

Trap RPM is 6200. I know diet is in the works. I'm 240 need to lose 50lbs

Maybe easier to put the car on a diet

 

[BSB67]

Those heads, cam, cubes, and weight in Wisconsin in September, I’d be looking for the reasons why it’s not trapping at 126 mph.

Can you try a big 4 bbl on a good single plane manifold?

 

[67MPRFAN]

I agree with Ramcharger try shifting a little higher.
60 fts is just a tad off for the times your running

 

[33 IMP]

I agree with all the advice you have gotten so far.
If it's not spinning a tire, more launch rpm.
You've got good heads, and a very decent cam. I'd try shifting at 6500.
I have heard that the original max wedge crossram is a cork, tuned for midrange torque. My car ran the same with a TM7 and an 850, as the crossram with two 750 competition carters.
With your heads, and displacement and camshaft..... I'd put a super Victor and a 1050 dominator on it.

 

[64plymouth]

Those heads, cam, cubes, and weight in Wisconsin in September, I’d be looking for the reasons why it’s not trapping at 126 mph.

Can you try a big 4 bbl on a good single plane manifold?

I have an Indy single plane intake and an 950 hp holley

 

[64plymouth]

The first passes I made with this motor I had an 8-3/4 with 4.56 gears shifting at 6500 and ran a best of 1.57 60ft 11.26 ET and 118.95 mph trapping at 6700. I thought i was turning motor to high for the restrictive intake. That is why I changed gears and shift points.

 

[33 IMP]

Are you SURE you have full throttle with the Eddie's? I have heard of linkage problems with the eddies on the crossrams having a different lever attachment location than the Carters.

 

[NSS Guy]

The car should 60ft better than 1.55-1.58. That is where you need to work. With your combo that should be 1.50 or less, I suspect the converter. my 2 cents fwiw

 

[33 IMP]

The first passes I made with this motor I had an 8-3/4 with 4.56 gears shifting at 6500 and ran a best of 1.57 60ft 11.26 ET and 118.95 mph trapping at 6700. I thought i was turning motor to high for the restrictive intake. That is why I changed gears and shift points.

I would have changed the intake......

 

[Outsider]

Some good advice above. Some details missing perhaps. Fuel pressure through the lights, chassis info, Caltracs or just a pinion snubber, size of slicks or drag radials, etc.

In general, less wt would be good and easier on parts. Glass hood, battery in trunk, no radio, etc. And perhaps gears in between what you mentioned, carb tuning, and probably about the shift points mentioned ok with the factory cross ram, unless the super stock mods have been made.

 

[64plymouth]

Are you SURE you have full throttle with the Eddie's? I have heard of linkage problems with the eddies on the crossrams having a different lever attachment location than the Carters.

Yes

 

[64plymouth]

Some good advice above. Some details missing perhaps. Fuel pressure through the lights, chassis info, Caltracs or just a pinion snubber, size of slicks or drag radials, etc.

In general, less wt would be good and easier on parts. Glass hood, battery in trunk, no radio, etc. And perhaps gears in between what you mentioned, carb tuning, and probably about the shift points mentioned ok with the factory cross ram, unless the super stock mods have been made.

Fuel pressure through the lights is 5-1/2. 90/10 shocks in front stock 318 t-bars 5in of front end travel. SS springs clamped 29.5x9 bias slicks 1/2 ton truck shocks in back. No radio, heater box, rear seat. Plastic buckets 8point roll bar battery in trunk. Aluminum radiator and water pump. Weight is 54% on front 46% on back

 

[64plymouth]

I would have changed the intake......

I think that is the next step. Just to see. I want to make this crossram work.