Access to AMA Shipping Weights?

[Billy Nees]

Originally Posted by SDS Inc

All the engine gurus i talk to say the aluminum head loses 15 hp apples to apples. I'm thinking untouched that is probably correct but with the better combustion chambers etc who knows.

If this is in fact the case (talking Stock) and with the recent difficulty in getting the "aftermarket" heads then the Racers should not have any problem with NHRA removing the "aftermarket" heads from the accepted lists.
Maybe they (NHRA) could use their recently enacted Rescission policy!

[Adub464Q]

What class factor is required for a combo to be obsoleted from Stock Eliminator?

I understand that 7.50 is the factor for AA....but can the combo be any amount under 7.50 and still be allowed to run AA?

Or what is the lowest threshold class factor still allowed in stock? Is a 6.95 class factor allowed to run in AA still?

[GTS340]

Not sure I'm on the right subject here. Check out the 71 440 6bbl Roadrunner. It can run A/SA. AA/SA with a Hemi. It is also a natural E/SA with a 340. Some weight got trimmed off that car. Cool makes a new combination in lighter trim.

Paul

[littlemanjoe]

Hopefully the Mopar big blocks 6 pack combos can get an HP break so we can keep up with the others.
The cars have to weigh almost 4000 lbs
Trying to run with cars that make the same power that weigh 3400 lbs.

It's now like taking a knife gun fight.

[Mike Volkman]

...

[GTS340]

So how does the AMA car weight work? I looked at 1970 Plymouth 340 Duster AMA specs. It shows shipping weight at 3105lbs and curb weight at 3269lbs. I get an average of 3187lbs and NHRA shows the shipping weight at 3186lbs. Is that the method or just lucky on one?

Paul

[Larry Hill]

I was told shipping weight. All the curb weights are the same on the AMA Sheets for a 70 Cuda, 340, 383, 440, and Hemi. I wonder how NHRA verified the weight of one Cuda with the 340 to the weight of 426 Hemi Cuda?

[Frank Bialas]

Originally Posted by GTS340

Not sure I'm on the right subject here. Check out the 71 440 6bbl Roadrunner. It can run A/SA. AA/SA with a Hemi. It is also a natural E/SA with a 340. Some weight got trimmed off that car. Cool makes a new combination in lighter trim.

Paul

Paul, help me out here maybe I'm confused. The 71 RR 6pak can run A/SA has a lesser shipping weight than GTX. So RR is a natural B and GTX is a Natural C makes sense, Got it. NOW in 1970 both are natural C and the RR has a higher shipping weight, this doesn't seem right??? RR was always the lighter package.

[SSDiv6]

Originally Posted by Larry Hill

I was told shipping weight. All the curb weights are the same on the AMA Sheets for a 70 Cuda, 340, 383, 440, and Hemi. I wonder how NHRA verified the weight of one Cuda with the 340 to the weight of 426 Hemi Cuda?

There has to be a time in the past that someone got the terms shipping weights and curb weights confused.

As Dwight and I explained earlier, the shipping weight was sort of a "Flat Rate" measurement for shipping purposes, that did not take into account the options of the car, just enough gas to move the car around, no passengers, and without cargo.

The OEM's did away with shipping weights many years ago and kept the curb weights, which accounts for a car with all fluids, full tank, and standard equipment for the specific model.

It is similar to the current curb weight narrative Ford uses for their products and what they weight they recommend for shipping considerations.

https://www.ford.com/support/how-tos...of-my-vehicle/

[Frank Castros]

My question is what prompted the review and adjustments? How often is it done?
I don't recall it happening when I raced in the seventies and eighties.