Access to AMA Shipping Weights?

[Rory McNeil]

I guess Dwight`s site has not updated this new development, but upon looking at the 70 Barracuda/Cuda page, couldn`t help but find it interesting, that unlike most other combos, both the 340 and 440 6 barrel combos are rated considerably LOWER with Edelbrock aluminum heads, than the factory iron heads. the AAR 340 3x2 is rated at 319HP with iron heads, and only 304 with the Edelbrocks, and the automatic 440 6bbl is 395 HP with iron, and 377(!) with Edelbrocks! Pretty sweet deal, the Edelbrock heads allow the car to weigh 150 pounds less than iron. Any other combos get less HP with aftermarket heads? They must be a real awful "upgrade".