newbee 68 dart 440 ez headed hughes cam 613&626 250 256, 410 gear.ran yesterday 1.47 60 out the door at 11.26 119. what wrong with this combo

Welcome really need more info, tire size,converter,weight etc. 60' looks good it's not making top end HP unless theres a problem elsewhere.

quicktree, 325 et streets,3500 stall, 3400 lbs me in.850 mighty demon,indy-2 manifold

looks like it's just not making the power it should. I would have a bigger converter but you can't complain about the 60'. check timing and see if you can borrow a bigger carb. play with shift points.

are the heads ported? if not that should be the next thing you do.

the heads are ported. i tried shifting between 6500&7000 no change.

check and make sure the throttle is open all the way. you have 60' for mid 10s. if your sure about the igniton and timing I would be looking at the carb maybe.

timing at 39 degrees ignition all msd no missfire

try 34-36 just to see what happens.

If all else is in line its time for leakdown and compression checks.

checked throttle,tried 34 no change, fresh motor.25passes

Fuel system up to par? Have a fuel pressure gauge on it?

holley blue,fuel gauge under hood set at 7 lbs.is a blue pump enough volume?

Whats the compression?

Way too big a cam for a 3500 stall converter. Im guessing that cam doesnt really come on to 5500 or so.

You have a 3500 stall converter and shifted at 6500 or 7K?

Bump that converter up to 4500 or higher (need all the facts). By the time the engine is making power your half way down the track.

1.47 is not great 60, but may be tire limited.


I think your combo is just too far apart on a few different areas.

compression 10.66,had the car on the chassis dyno peak torque at 5200 408

I definatly think your combo is a bit out of sorts.

I really dont like that carb.

Definatly need a looser converter.

As a side note, what are you trapping RPM at, and whats the diameter of your tires, and shift point. Have you checked the converters efficiency?

325 ET Street radials should be about 28" dia, with that 4.10 gear. I agree the sixty foot is good for the ET, my target sixty foot equation says that is what the following ET should be getting:

Sixty = 0.12xET + 0.17

ET = (Sixty-0.17)/0.12 = 10.83

My other curve fits to general cars in this league inputing 119 mph gives 11.25, so the mph and ET are in line.

More stall speed also improves ET during the shift recovery. Putting an 8" race converter around 5000 rpm would make it feel completely different.

That really isn't very much duration (250), but with your converter and 10.6 CR that is fine. Is that a roller cam? IMO, to take advantage of the heads (assuming decent port work) and the Indy MW intake, you would need to step up the converter and cam, limited by CR.

440jim its a solid flat,do you think i am maxad out with this cam and convertor