NHRA allows Alum heads in stock/ss

[Tim Ellis]

They aren't the same configuration as stock heads, at least the small block Ford isn't. It's a Performer RPM head, bigger valves, better ports... I don't think it's a bad idea. A lot more cost effective than paying to build a set of SS heads. Yes I know the argument about escalating mods.

[Christopher Stewart]

Originally Posted by Tim Ellis

They aren't the same configuration as stock heads, at least the small block Ford isn't. It's a Performer RPM head, bigger valves, better ports... I don't think it's a bad idea. A lot more cost effective than paying to build a set of SS heads. Yes I know the argument about escalating mods.

Easier to repair too.

[Rory McNeil]

I`m not sure if all the Edelbrock heads have no exhaust crossover passage or not, but I know many do. Yet with a factory head, you are not allowed to plug the crossover into the bowl area. Also, I`m pretty sure that not all the new heads approved use the same combustion chamber volume or valve sizes for every application that they are approved for. Interesting, eh?

[Tim Ellis]

I wish the Performer rpm heads were ok'd for stock too, especially for my 89 5.0l

[Bill Harris]

Like the Olds head, the Edelbrock is only specified for SS for the 429 CJ Ford motor (at a 10 HP premium), of which there has been exactly one built in the last 20 years, and it hasn't been run in two years. The stocker still has to run the OEM unobtainium version. And there are those who are bitching about the lack of Chevy heads... don't make me laugh...