New Aluminum Cylinder Heads for the Hemis
 

Let the Bitching begin! Lol

Re: New Aluminum Cylinder Heads for the Hemis
 

The aluminum head is now accepted, but with an additional 10 horsepower added. But, they are better for repair if needed.

Re: New Aluminum Cylinder Heads for the Hemis
 

Like in Super Stock the aluminum head for the 428 Pontiac from Edelbrock has to have a part number on them with the NHRA logo will this be the case??

Re: New Aluminum Cylinder Heads for the Hemis
 

The aluminum heads that were approved in the past for the Street Hemi combinations carried a Mopar part number. I bought mine at a local Dodge dealer. They were cast by Edelbrock for Mopar.

I did see last night the Indy 426-SR was also approved for S/S only. These are the old Canfield castings...which were essentially an aluminum version of an original head. Canfield introduced them in the mid-late 2000's, and went out of business not long after. Indy sells them as a 200cc intake port though, so they cannot be used out of the box without work.

How long will this last though? The last time NHRA approved aluminum heads for AH, they rescinded it about 3 days later.

Re: New Aluminum Cylinder Heads for the Hemis
 

What does a 559 M-2 head look like?
I havent seen anything but the M-1's.

All those edelbrock heads have the wrong ex valve angle. I assume thats a typo.

Re: New Aluminum Cylinder Heads for the Hemis
 

Dyno, someplace I still have a copy of the letter/petition that went around 5 or 6 years ago!! It has taken a while

Re: New Aluminum Cylinder Heads for the Hemis
 

I didn't even realize they approved the Victor Jr head also and I looked right at that note. You're correct, the exhaust angle is altered 1.5 degrees from stock on those. That's why it didn't even cross my mind to check those part numbers.

Re: New Aluminum Cylinder Heads for the Hemis
 

Lloyd and I put that letter together and sent it to NHRA. It was rejected and I thought that idea was gone. I have been told the aluminum head would always make less power, but they would be repairable. That was the concept/reason for the aluminum head. The other plus side is that the cylinder head experts would prefer to work on an aluminum head over the cast iron head.

Re: New Aluminum Cylinder Heads for the Hemis
 

Why not give aluminum heads to all engines ?

Re: New Aluminum Cylinder Heads for the Hemis
 

Here's a better question (for me anyway)!
Why not take away all of the aluminum cylinder heads from engines that never had them?
I doubt that there will ever be an aluminum head for a 6 cylinder Chevy or a 301 Pontiac!
From where I'm sitting it looks like NHRA is discriminating against me!

Re: New Aluminum Cylinder Heads for the Hemis
 

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 ??

Re: New Aluminum Cylinder Heads for the Hemis
 

Ok here is a thought! Name a manufacturer making cast iron heads for an A/H motor? Tic tok tic tok there isn’t any so Hemi’s break and when they do it a big deal so what do you do? There isn’t any anywhere to replace them! So the nhra will have to kill the combo and that’s not going to happen!


People talk about not allowing aluminum heads in if that engine never came with them. Well explain the GT classes allowing rear wheel drives and engine other than 4 cylinders!

Re: New Aluminum Cylinder Heads for the Hemis
 

In 1965 the Race Hemi came with an aluminum head because the aluminum front group ( fenders, hood, doors, etc.) was no longer allowed . So there is a precedent for the approval. I know of no Hemi racer jumping on this change.

Re: New Aluminum Cylinder Heads for the Hemis
 

Bubski would like to clarify his position !! To give everyone aluminium heads is absurd !! they're simply not available to all combos and it would give those with that choice an advantage over the other combos more than likely !! With the exception of SS/AH there's a lot of different engines ,makes ,etc in the regular classes and to have parts only available to your combo and not the next guys is wrong !! SS/AH is the only exception I can see to the head rules 1. they only race against themselves in class !! 2, those heads are actually hard to find ,not just an excuse for wanting an advantage like the 396 gets its open chamber aluminium head now and countless others !! factory heads for those exist in real life !! No reason to give them anything but what came on them !! Again AH is a totally different animal and they're gonna need something if they're gonna continue to race !! Maybe with these new blocks coming out heads are in the works for them also !! Who knows they might be iron !!

Re: New Aluminum Cylinder Heads for the Hemis
 

James The GT classes rules are separate from the traditional Super Stock Classes and were made to accommodate the next step in modern racing in the 80s at that time .I feel the GT class has made a special input for Super Stock and FJ smith started the front-wheel to rear-wheel cars as part of the Progression of Super Stock it has been a significant positive effect in Modern racing since then> Some changes to rules have to be made to accommodate the future of each combination

Re: New Aluminum Cylinder Heads for the Hemis
 

Don to totally agree I was just using it as an example of other things allowed in that was not from the factory

Re: New Aluminum Cylinder Heads for the Hemis
 

These heads have been available for 10 years from Mopar. This was the head we put on the 528 crate engines. Edelbrock told me they have a P.O from Mopar and are scheduled for late December. -Ray Barton

Re: New Aluminum Cylinder Heads for the Hemis
 

That’s good but I don’t think I’m personally going to change my Westcott heads for the aluminum

Re: New Aluminum Cylinder Heads for the Hemis
 

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.

Re: New Aluminum Cylinder Heads for the Hemis
 

Charlie,
Can you explain why this is?

"There is no performance gain, possibly a loss by putting the same port design in an aluminum head.[/QUOTE]

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..

Re: New Aluminum Cylinder Heads for the Hemis
 

Thermal efficiency


Stan

Re: New Aluminum Cylinder Heads for the Hemis
 

That's what i figured - thanks.

Re: New Aluminum Cylinder Heads for the Hemis
 

their are several combo that never had aluim heads that have them now.

Re: New Aluminum Cylinder Heads for the Hemis
 

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.