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-   -   New Aluminum Cylinder Heads for the Hemis (https://classracer.com/classforum/showthread.php?t=83215)

jaythorne 10-20-2022 04:51 PM
Re: New Aluminum Cylinder Heads for the Hemis
 
I used to be against the aluminum head....but that's when the cast iron was readily available....now that's not the case....I think the alum should be allowed now,but without a weight penalty..

Stan Weiss 10-20-2022 06:01 PM
Re: New Aluminum Cylinder Heads for the Hemis
 
Quote:
Originally Posted by theman440 (Post 669526)
Charlie,
Can you explain why this is?

Quote:
"There is no performance gain, possibly a loss by putting the same port design in an aluminum head.

Thermal efficiency


Stan

theman440 10-20-2022 09:12 PM
Re: New Aluminum Cylinder Heads for the Hemis
 
That's what i figured - thanks.

Jim Hanig 10-20-2022 10:37 PM
Re: New Aluminum Cylinder Heads for the Hemis
 
Quote:
Originally Posted by bubski (Post 669260)
Bubski's thinking is !! this is Stock, Super Stock !?? Why in the world do you need heads that never came on your combo ?? So what if a set of cores costs 2-3K for the most exotic combos !! The new aluminum heads will cost you at least close to 2K before you send them out for a 5K valve job n CC !! Now Bubski realizes there's no advantage to them !! HAHAHA !! When a racer picks a combo its up to that racer to decide if the parts available and the price you would pay for them are worth running that combo !! Bracket 1 and 2 allow any head you desire !! Not S/SS !! Will this nonsense ever end ??
their are several combo that never had aluim heads that have them now.

SSDA Hemi 10-21-2022 05:43 AM
Re: New Aluminum Cylinder Heads for the Hemis
 
Quote:
Originally Posted by charlie westcott (Post 669508)
There is a 559-M2 head on the list.
Thats what I was referring to.
The Mopar alum head looks to be the best candidate to me, but I dont see any reason to use them with a 60# weight penalty.
There is no performance gain, possibly a loss by putting the same port design in an aluminum head.
I was wondering the same thing, actually got excited thinking Mopar was casting a new iron Hemi head. After looking at the data it appears NHRA screwed up and put the cast iron "559"# with the Aluminum head "M2". There is no aluminum head casting # listed on the 68 Chrysler Tech spec sheet, and I think we all agree there is no present "M2" cast iron Hemi head.
.
I hope I'm wrong but it seems the correct casting number added should be 2531110-M2. Hopefully mopar or another source starts casting iron Hemi heads in the future. SS/AH needs parts to survive and advance.


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