Access to AMA Shipping Weights?

[Billy Nees]

Originally Posted by Rory McNeil

Billy, regarding the whole aluminum head deal, supposedly the aftermarket heads were allowed because supposedly usable production castings were getting hard to find. Considering the majority of the "allowed" heads were made in huge numbers, it seems odd to me that guys were having trouble scrounging up SB & BB Chevy castings, SB and FE Ford heads, SB & BB MoPar wedge heads, yet the guys with truly rare heads, like the 413 and 426 Max Wedge guys somehow manage to able to carry on. Just seems a bit odd. Maybe as a guy whose combination was not blessed with aftermarket heads,(or intake manifold), at least for Stock, I am somewhat skeptical .

Rory, I agree with everything that you've said. They were "allowed" WITH a 10 HP penalty over the production head.
Somehow, the Mopar heads are being treated as if the aluminum head is a different combo from the OEM head with it's own HP factor. Not the +10 HP over the OEM head that NHRA originally assigned.

[SS734]

Originally Posted by Billy Nees

Rory, I agree with everything that you've said. They were "allowed" WITH a 10 HP penalty over the production head.
Somehow, the Mopar heads are being treated as if the aluminum head is a different combo from the OEM head with it's own HP factor. Not the +10 HP over the OEM head that NHRA originally assigned.

Its like that for all the aftermarket heads! All have been treated as a separate combo.

Billy- What happens when the "aftermarket heads" get the HP hit? Does it effect the "stock head" HP Factor too?

[Billy Nees]

Originally Posted by SS734

Its like that for all the aftermarket heads! All have been treated as a separate combo.

Billy- What happens when the "aftermarket heads" get the HP hit? Does it effect the "stock head" HP Factor too?

I can understand your point BUT that's not the way that it was "sold" to us.

IMHO, if the aftermarket head (carrying a +10 factor) gets a HP hit then yes, it should affect the stock head.

The point of my side of this conversation is that whatever the "stock head" HP factor is, the "aftermarket head" factor should be +10!

These "aftermarket" heads were not handed out to be of any advantage other than that of access to the Racer. If the Racer chooses to take advantage of the ease of access provided by the "aftermarket" head then the Racer should be willing to accept the +10 HP/weight penalty.

[Mike Volkman]

Aluminum or replacement heads - Some received a 10 hp adjustment and others 5. On our 318 combo we petitioned NHRA for the 5 hp like our Chevy bros recd and we got it. Noticed some bb chevy also recd 10. Not sure the thinking with NHRA. Typo?

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.

So if an aluminum is untouched there could be a hp reduction under the then current factored rating. I know our 340 aluminum ss cant compare to the steel head factor. +17 hp difference on aluminum, not 10 or 5.

[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

[Dave Ficacci]

Originally Posted by 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?

Per Wesley the ZL1 can still run AA at 6.96. I got this information 2nd hand albeit from a reliable source.

[SS734]

Originally Posted by Billy Nees

I can understand your point BUT that's not the way that it was "sold" to us.

IMHO, if the aftermarket head (carrying a +10 factor) gets a HP hit then yes, it should affect the stock head.

The point of my side of this conversation is that whatever the "stock head" HP factor is, the "aftermarket head" factor should be +10!

These "aftermarket" heads were not handed out to be of any advantage other than that of access to the Racer. If the Racer chooses to take advantage of the ease of access provided by the "aftermarket" head then the Racer should be willing to accept the +10 HP/weight penalty.

I agree 100% with you. All of a sudden there were all these new combos born over night!
How about the stock heads make one natural class but the aftermarket headed combos change the natural class.

Oh and add in the combos that give you 2 carb options and 2 different hp factors then add in aftermarket heads!

6 different combos out of one original combo!

[Larry Hill]

Dave I don’t think the 427/445 69 Camaro can run AA/SA with the shipping weight of 3096. Divide 3096 by 445= 6.96 p/w. The natural imaginary class is two class below the 7.50 to 7.99 weight break. Adding 222.5 lbs to the shipping weight of 3096 would be 3318.5 lbs. Divide 3318.5 by 445hp = 7.457 p/w, the car would still not be in 7.50 to 7.99 window.

I believe class cars can move up or down one class from the natural class provided there’s a class for it to fit in. That’s how I read the rule book, I could be wrong.

Uncle Al was wise beyond his years.