Approval of Super Stock Class Aftermarket Cylinder Heads

[Jim Caughlin]

Originally Posted by MLP

This approach seems to make sense to me at first blush.That being said,I have a question that's been bothering me for a while.

The guide lists Edlebrock # 60917 as a replacement for big block Mopars in Stock. The thing I don't understand is how can this head be used as it comes with a 2.14 in. and a 1.81 ex machined in this head? No bb Mopar came with these valve sizes.

A 426 Street wedge has a 2.08 in. and a 1.60 ex, and yet this head is listed in the guide as a replacement. How the #$%$ can you go that far backwards in the bowl without welding and grinding? I'm not a professional head porter, but I can imagine the new seat that would be required to accommodate the much smaller valves would have a huge shelf in the now way too big bowl. And, as Chad as mentioned, these heads don't appear to be available anyway. If Profiler could deliver usable castings that have the right chamber and port shapes and they pour the right volumes why wouldn't they be a good idea?

Replacement aluminum heads are ALL READY LEGAL people, that horse is out of the barn and ain't coming back. Allowing these heads in would simply provide a head that's available and possibly bring more new builds in to the mix.

Just my humble opinion, your mileage may vary.

Same issue with the aftermarket replacement heads for SB Fords, they come with too large of valves so all of the seats have to be removed, the ports need to be welded up and new smaller seats installed before you can proceed with trying to make a viable and legal head, the initial cost of the aftermarket castings is by far the cheapest part of the project. Also, there is a HP adjustment if you choose to run them.