cam or converter
 

There is something wrong with my setup. either the cam or the torque convertor must go. The car feels like it is towing another car down the track.The best 60' time is 1.90 it looks like it's in slow motion at the line.
Any ideas?


400 Pontiac bored .030 over
CAT H beam connecting rods
Comp cam solid lift cam 51-000-5
duration @ .050 248 intake 256 exhaust
lift intake .531 lift exhaust .550 lobe separation
108 Intake center line 108
1.5 roller rockers
#13 heads 2.11 1.77 valves
Edelbrock RPM intake 850cfm
Edelbrock carb
MSD billet distributor/ MSD blaster 2 coil

69 TH400 Trans Continental converter 3000 stall 10”

12 bolt rear end Moser axles and spool 3.73 rear gear boxed lower control arm Adjustable upper arms Air bag in right coil Adjustable drag shocks on all Four Corners Moroso Trick springs

M/T slicks 29.5 X 10.5
car weight is 3200lb

Vince

Anywork done to the heads? What is your other times like 330' 660' and 1/4 mile? Does the car lay down the whole track or does it seem to run better in a certain portion of the track? This information will help diagnose what is going on during your run.

That cam sounds pretty healthy and the car seems to have alot of good parts that would make it run good as well as being pretty light.

Robert

Carb? I have seen a few threads which do not lean favourably to the edelbrock carbs on pontiacs!

Timing?

I would look at how fast your TOTAL timing is coming in, then how well the carb is responding. You need a holley based double pumper or a very well set up quadrajet.

Robert
Heads are pocket ported By Kauffmans but no flow numbers
1/8 [email protected]
1/4 [email protected]
The car never seems like it pulls hard I have a 70' GTO that is much more fun to drive

timing
 

Timing is set at 15 with a total of 36 in at 2500rpm. Cliff R set up the carb and I have also used an Edelbrock 750 performer with not much difference in performance.

What kind of distributor are you using?
Vacuum advance?

I would think that it will be way cheaper and make an easier to drive car if you swapped the cam for one much, much smaller. The converter it would take to work with that one will be very expensive and then you will have a strip car that will be annoying to drive on the street.

MSD billet distributor Vacuum advanced is removed.

Tom
I am starting to think the same way about the cam. The car will be driven on the streets once in a while but mostly a drag car.

If I were you, I would first try to lock the distributor to give you full advance all the time. That should wake it up. I also think you may need more converter, but you still should be getting way better than a 1.90 60ft unless you are spinning!

Last, I would see if you could borrow a known good 750 double pumper to try.

No tire spin at the line. Cliff R ran my carb on his car and it ran mid 11's with no problems. How do you lock the distributor in a full advance?

I dont run an MSD distributor, so I dont know for sure on yours. I think there is a kit you can buy that will lock it out.

That cam is way too big for a 400. Nothing you can do is going to make it run very well except some 4:56 gears and an 8" converter. Jim

I ran the H0-3 cam with similar specs in a 462 with about 11:1 compression and a similar setup to yours and it ran pretty good. I think the cam is WAY TOO BIG unless you go to 4.56 gears and/or a bigger convertor. A 750cfm should be plenty for those cubes/rpm. What is your compression?

PHILLYGOAT

heads are 13's and the block was not zero decked so it should be a little less than 10.1

Was the cam degreed?
Or just "line up the dots" and assumed to be "straight up"???

I'd at least try advancing the ICL to 104-102 degrees or so first...

That H-O cam is a hydraulic cam with roughly the same specs,INDY's cam is a solid cam,big difference in most folks books.

In that other thread you said you had gotten some mid twelves (12.53 IIRC) out of it but were having traction issues,what's changed since then???

Crower or Comp XE274 hyd flat tappet cam. Something in the 230-236 range, 500 lift. Problem solved!

I run a XE274 in a 9.3:1 407, and I'm happy with it. Best time so far is 8.2 sec in the 1/8 at 84.5 MPH. 3600lb car, 3200 stall verter, 3.23 gears. Shooting for the 7s with 3.90s, tires and tuning.